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

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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