Mercurial > jhg

comparison src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 606:5daa42067e7c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents ed243b668502
children e1b29756f901
comparison
equal deleted inserted replaced
605:c56edf42be64 606:5daa42067e7c
82 // ensure contract of CFG_PROPERTY_MAPIO_LIMIT, for mapioBoundary == 0 use MAX_VALUE so that no file is memmap-ed 82 // ensure contract of CFG_PROPERTY_MAPIO_LIMIT, for mapioBoundary == 0 use MAX_VALUE so that no file is memmap-ed
83 private static int mapioBoundaryValue(int mapioBoundary) { 83 private static int mapioBoundaryValue(int mapioBoundary) {
84 return mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary; 84 return mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
85 } 85 }
86 86
87 public DataAccess createReader(File f) { 87 public DataAccess createReader(File f, boolean shortRead) {
88 if (!f.exists()) { 88 if (!f.exists()) {
89 return new DataAccess(); 89 return new DataAccess();
90 } 90 }
91 try { 91 try {
92 FileChannel fc = new FileInputStream(f).getChannel(); 92 FileChannel fc = new FileInputStream(f).getChannel();
93 long flen = fc.size(); 93 long flen = fc.size();
94 if (flen > mapioMagicBoundary) { 94 if (!shortRead && flen > mapioMagicBoundary) {
95 // TESTS: bufLen of 1024 was used to test MemMapFileAccess 95 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
96 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog()); 96 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog());
97 } else { 97 } else {
98 // XXX once implementation is more or less stable, 98 // XXX once implementation is more or less stable,
99 // may want to try ByteBuffer.allocateDirect() to see 99 // may want to try ByteBuffer.allocateDirect() to see