Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 327:3f09b8c19142

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Tests for Revlog.Inspectors
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 04 Oct 2011 07:24:44 +0200
parents 981f9f50bb6c
children 3cfa4d908fc9
rev   line source
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
1 /*
74
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
2 * Copyright (c) 2010-2011 TMate Software Ltd
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
3 *
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
4 * This program is free software; you can redistribute it and/or modify
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
5 * it under the terms of the GNU General Public License as published by
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
6 * the Free Software Foundation; version 2 of the License.
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
7 *
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
8 * This program is distributed in the hope that it will be useful,
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
11 * GNU General Public License for more details.
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
12 *
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
13 * For information on how to redistribute this software under
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
14 * the terms of a license other than GNU General Public License
102
a3a2e5deb320 Updated contact address to support@hg4j.com
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 74
diff changeset
15 * contact TMate Software at support@hg4j.com
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
16 */
74
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
17 package org.tmatesoft.hg.internal;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
18
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
19 import java.io.File;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
20 import java.io.FileInputStream;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
21 import java.io.IOException;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
22 import java.nio.ByteBuffer;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
23 import java.nio.MappedByteBuffer;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
24 import java.nio.channels.FileChannel;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
25
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
26 import org.tmatesoft.hg.core.HgBadStateException;
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
27 import org.tmatesoft.hg.core.SessionContext;
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
28
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
29 /**
74
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
30 *
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
31 * @author Artem Tikhomirov
6f1b88693d48 Complete refactoring to org.tmatesoft
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
32 * @author TMate Software Ltd.
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
33 */
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
34 public class DataAccessProvider {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
35
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
36 private final int mapioMagicBoundary;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
37 private final int bufferSize;
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
38 private final SessionContext context;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
39
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
40 public DataAccessProvider(SessionContext ctx) {
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
41 this(ctx, 100 * 1024, 8 * 1024);
27
b0a15cefdfd6 Cons args instead of fixed consts
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 26
diff changeset
42 }
b0a15cefdfd6 Cons args instead of fixed consts
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 26
diff changeset
43
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
44 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize) {
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
45 context = ctx;
27
b0a15cefdfd6 Cons args instead of fixed consts
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 26
diff changeset
46 mapioMagicBoundary = mapioBoundary;
b0a15cefdfd6 Cons args instead of fixed consts
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 26
diff changeset
47 bufferSize = regularBufferSize;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
48 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
49
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
50 public DataAccess create(File f) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
51 if (!f.exists()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
52 return new DataAccess();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
53 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
54 try {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
55 FileChannel fc = new FileInputStream(f).getChannel();
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
56 int flen = (int) fc.size();
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
57 if (fc.size() - flen != 0) {
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
58 throw new HgBadStateException("Files greater than 2Gb are not yet supported");
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
59 }
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
60 if (flen > mapioMagicBoundary) {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
61 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
62 return new MemoryMapFileAccess(fc, flen, mapioMagicBoundary);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
63 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
64 // XXX once implementation is more or less stable,
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
65 // may want to try ByteBuffer.allocateDirect() to see
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
66 // if there's any performance gain.
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
67 boolean useDirectBuffer = false;
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
68 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
69 return new FileAccess(fc, flen, bufferSize, useDirectBuffer);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
70 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
71 } catch (IOException ex) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
72 // unlikely to happen, we've made sure file exists.
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
73 context.getLog().error(getClass(), ex, null);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
74 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
75 return new DataAccess(); // non-null, empty.
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
76 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
77
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
78 // DOESN'T WORK YET
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
79 private static class MemoryMapFileAccess extends DataAccess {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
80 private FileChannel fileChannel;
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
81 private final int size;
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
82 private long position = 0; // always points to buffer's absolute position in the file
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
83 private final int memBufferSize;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
84 private MappedByteBuffer buffer;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
85
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
86 public MemoryMapFileAccess(FileChannel fc, int channelSize, int /*long?*/ bufferSize) {
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
87 fileChannel = fc;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
88 size = channelSize;
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
89 memBufferSize = bufferSize;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
90 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
91
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
92 @Override
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
93 public boolean isEmpty() {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
94 return position + (buffer == null ? 0 : buffer.position()) >= size;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
95 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
96
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
97 @Override
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
98 public int length() {
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
99 return size;
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
100 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
101
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
102 @Override
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 51 102
diff changeset
103 public DataAccess reset() throws IOException {
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
104 seek(0);
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 51 102
diff changeset
105 return this;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
106 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
107
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
108 @Override
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
109 public void seek(int offset) {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
110 assert offset >= 0;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
111 // offset may not necessarily be further than current position in the file (e.g. rewind)
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
112 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
113 buffer.position((int) (offset - position));
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
114 } else {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
115 position = offset;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
116 buffer = null;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
117 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
118 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
119
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
120 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
121 public void skip(int bytes) throws IOException {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
122 assert bytes >= 0;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
123 if (buffer == null) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
124 position += bytes;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
125 return;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
126 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
127 if (buffer.remaining() > bytes) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
128 buffer.position(buffer.position() + bytes);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
129 } else {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
130 position += buffer.position() + bytes;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
131 buffer = null;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
132 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
133 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
134
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
135 private void fill() throws IOException {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
136 if (buffer != null) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
137 position += buffer.position();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
138 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
139 long left = size - position;
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
140 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
141 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
142
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
143 @Override
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
144 public void readBytes(byte[] buf, int offset, int length) throws IOException {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
145 if (buffer == null || !buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
146 fill();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
147 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
148 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
149 while (length > 0) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
150 int tail = buffer.remaining();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
151 if (tail == 0) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
152 throw new IOException();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
153 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
154 if (tail >= length) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
155 buffer.get(buf, offset, length);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
156 } else {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
157 buffer.get(buf, offset, tail);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
158 fill();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
159 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
160 offset += tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
161 length -= tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
162 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
163 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
164
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
165 @Override
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
166 public byte readByte() throws IOException {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
167 if (buffer == null || !buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
168 fill();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
169 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
170 if (buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
171 return buffer.get();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
172 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
173 throw new IOException();
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
174 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
175
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
176 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
177 public void done() {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
178 buffer = null;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
179 if (fileChannel != null) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
180 try {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
181 fileChannel.close();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
182 } catch (IOException ex) {
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
183 StreamLogFacility.newDefault().debug(getClass(), ex, null);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
184 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
185 fileChannel = null;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
186 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
187 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
188 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
189
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
190 // (almost) regular file access - FileChannel and buffers.
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
191 private static class FileAccess extends DataAccess {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
192 private FileChannel fileChannel;
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
193 private final int size;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
194 private ByteBuffer buffer;
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
195 private int bufferStartInFile = 0; // offset of this.buffer in the file.
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
196
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
197 public FileAccess(FileChannel fc, int channelSize, int bufferSizeHint, boolean useDirect) {
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
198 fileChannel = fc;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
199 size = channelSize;
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
200 final int capacity = size < bufferSizeHint ? size : bufferSizeHint;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
201 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
202 buffer.flip(); // or .limit(0) to indicate it's empty
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
203 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
204
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
205 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
206 public boolean isEmpty() {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
207 return bufferStartInFile + buffer.position() >= size;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
208 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
209
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
210 @Override
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
211 public int length() {
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
212 return size;
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
213 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
214
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
215 @Override
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 51 102
diff changeset
216 public DataAccess reset() throws IOException {
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
217 seek(0);
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 51 102
diff changeset
218 return this;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
219 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
220
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 27
diff changeset
221 @Override
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
222 public void seek(int offset) throws IOException {
23
6f9aca1a97be Severe defect in buffer wrap on seek
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 10
diff changeset
223 if (offset > size) {
6f9aca1a97be Severe defect in buffer wrap on seek
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 10
diff changeset
224 throw new IllegalArgumentException();
6f9aca1a97be Severe defect in buffer wrap on seek
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 10
diff changeset
225 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
226 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
227 buffer.position((int) (offset - bufferStartInFile));
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
228 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
229 // out of current buffer, invalidate it (force re-read)
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
230 // XXX or ever re-read it right away?
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
231 bufferStartInFile = offset;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
232 buffer.clear();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
233 buffer.limit(0); // or .flip() to indicate we switch to reading
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
234 fileChannel.position(offset);
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
235 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
236 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
237
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
238 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
239 public void skip(int bytes) throws IOException {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
240 final int newPos = buffer.position() + bytes;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
241 if (newPos >= 0 && newPos < buffer.limit()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
242 // no need to move file pointer, just rewind/seek buffer
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
243 buffer.position(newPos);
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
244 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
245 //
23
6f9aca1a97be Severe defect in buffer wrap on seek
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 10
diff changeset
246 seek(bufferStartInFile + newPos);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
247 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
248 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
249
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
250 private boolean fill() throws IOException {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
251 if (!buffer.hasRemaining()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
252 bufferStartInFile += buffer.limit();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
253 buffer.clear();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
254 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
255 fileChannel.read(buffer);
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
256 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
257 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
258 buffer.flip();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
259 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
260 return buffer.hasRemaining();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
261 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
262
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
263 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
264 public void readBytes(byte[] buf, int offset, int length) throws IOException {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
265 if (!buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
266 fill();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
267 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
268 while (length > 0) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
269 int tail = buffer.remaining();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
270 if (tail == 0) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
271 throw new IOException(); // shall not happen provided stream contains expected data and no attempts to read past isEmpty() == true are made.
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
272 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
273 if (tail >= length) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
274 buffer.get(buf, offset, length);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
275 } else {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
276 buffer.get(buf, offset, tail);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
277 fill();
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
278 }
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
279 offset += tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
280 length -= tail;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
281 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
282 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
283
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
284 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
285 public byte readByte() throws IOException {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
286 if (buffer.hasRemaining()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
287 return buffer.get();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
288 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
289 if (fill()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
290 return buffer.get();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
291 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
292 throw new IOException();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
293 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
294
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
295 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
296 public void done() {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
297 if (buffer != null) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
298 buffer = null;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
299 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
300 if (fileChannel != null) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
301 try {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
302 fileChannel.close();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
303 } catch (IOException ex) {
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
304 StreamLogFacility.newDefault().debug(getClass(), ex, null);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
305 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
306 fileChannel = null;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
307 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
308 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
309 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
310 }