Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/DataAccess.java @ 681:4f93bbc73b64

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Do not instantiate thousands of small arrays(numerous readInt/readLong calls)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:48:05 +0200
parents e1b29756f901
children
rev   line source
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1 /*
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2 * Copyright (c) 2010-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.io.IOException;
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20 import java.nio.ByteBuffer;
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22 /**
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23 * relevant parts of DataInput, non-stream nature (seek operation), explicit check for end of data.
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24 * convenient skip (+/- bytes)
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25 * Primary goal - effective file read, so that clients don't need to care whether to call few
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26 * distinct getInt() or readBytes(totalForFewInts) and parse themselves instead in an attempt to optimize.
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class DataAccess {
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32 private byte[] longBuffer;
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33
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34 public boolean isEmpty() throws IOException {
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35 return true;
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36 }
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37 // IOException due to few subclasses that have non-trivial length() operation
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38 // long length and offset are needed only in RevlogStream, makes no sense elsewhere
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39 // because chunks Mercurial operates with fit into int (4 bytes actualLength field)
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40 // For those that may face large pieces of data (actual data streams) there are #longLength
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41 // and #longSeek() to implement
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42 public int length() throws IOException {
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43 return 0;
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44 }
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45
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46 public long longLength() throws IOException {
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47 return length();
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48 }
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49
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50 public void longSeek(long offset) throws IOException {
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51 seek(Internals.ltoi(offset));
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52 }
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53
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54 /**
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55 * get this instance into initial state
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56 * @throws IOException
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57 * @return <code>this</code> for convenience
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58 */
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59 public DataAccess reset() throws IOException {
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60 // nop, empty instance is always in the initial state
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61 return this;
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62 }
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63 // absolute positioning
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64 public void seek(int offset) throws IOException {
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65 if (offset == 0) {
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66 // perfectly OK for the "empty slice" instance
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67 return;
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68 }
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69 throw new IOException(String.format("No data, can't seek %d bytes", offset));
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70 }
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71 // relative positioning
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72 public void skip(int bytes) throws IOException {
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73 if (bytes == 0) {
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74 return;
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75 }
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76 throw new IOException(String.format("No data, can't skip %d bytes", bytes));
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77 }
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78 // shall be called once this object no longer needed
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79 public void done() {
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80 // no-op in this empty implementation
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81 }
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82 public int readInt() throws IOException {
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83 if (longBuffer == null) {
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84 longBuffer = new byte[8];
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85 }
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86 byte[] b = longBuffer;
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87 readBytes(b, 0, 4);
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88 return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
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89 }
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91 /**
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92 * Read 8 bytes as long value, big-endian.
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93 */
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94 public long readLong() throws IOException {
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95 if (longBuffer == null) {
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96 longBuffer = new byte[8];
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97 }
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98 byte[] b = longBuffer;
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99 readBytes(b, 0, 8);
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100 int i1 = b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
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101 int i2 = b[4] << 24 | (b[5] & 0xFF) << 16 | (b[6] & 0xFF) << 8 | (b[7] & 0xFF);
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102 return ((long) i1) << 32 | ((long) i2 & 0xFFFFFFFFl);
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103 }
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104 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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105 if (length == 0) {
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106 return;
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107 }
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108 throw new IOException(String.format("No data, can't read %d bytes", length));
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109 }
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110 /**
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111 * reads bytes into ByteBuffer, up to its limit or total data length, whichever smaller.
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112 * XXX perhaps, in DataAccess paradigm (when we read known number of bytes, we shall pass specific byte count to read)
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113 */
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114 public void readBytes(ByteBuffer buf) throws IOException {
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115 // int toRead = Math.min(buf.remaining(), (int) length());
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116 // if (buf.hasArray()) {
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117 // readBytes(buf.array(), buf.arrayOffset(), toRead);
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118 // } else {
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119 // byte[] bb = new byte[toRead];
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120 // readBytes(bb, 0, bb.length);
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121 // buf.put(bb);
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122 // }
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123 // TODO [post-1.1] optimize to read as much as possible at once
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124 while (!isEmpty() && buf.hasRemaining()) {
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125 buf.put(readByte());
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126 }
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127 }
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128 public byte readByte() throws IOException {
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129 throw new UnsupportedOperationException();
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130 }
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131
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132 /**
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133 * Content of this DataAccess as byte array.
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134 * Note, likely changes position in the DataAccess.
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135 * Might provide direct access to underlying data structure in certain cases, do not alter.
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136 *
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137 * @return byte array of {@link #length()} size, filled with data
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138 * @throws IOException
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139 */
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140 public byte[] byteArray() throws IOException {
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141 reset();
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142 byte[] rv = new byte[length()];
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143 readBytes(rv, 0, rv.length);
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144 return rv;
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145 }
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146 }