Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/DataSerializer.java @ 659:a5cf64f2e7e4 smartgit-4.6
Poor performance when reading/collecting branch information. Respect new cache location for recent mercurial revisions. Use different algorithm to build branch cache
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> | 
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| date | Fri, 05 Jul 2013 20:42:45 +0200 | 
| parents | 6526d8adbc0f | 
| children | 14dac192aa26 | 
| rev | line source | 
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changeset | 1 /* | 
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changeset | 2 * Copyright (c) 2013 TMate Software Ltd | 
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changeset | 3 * | 
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changeset | 4 * This program is free software; you can redistribute it and/or modify | 
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changeset | 5 * it under the terms of the GNU General Public License as published by | 
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changeset | 6 * the Free Software Foundation; version 2 of the License. | 
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changeset | 7 * | 
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changeset | 8 * This program is distributed in the hope that it will be useful, | 
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changeset | 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 
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changeset | 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 
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changeset | 11 * GNU General Public License for more details. | 
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changeset | 12 * | 
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changeset | 13 * For information on how to redistribute this software under | 
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changeset | 14 * the terms of a license other than GNU General Public License | 
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changeset | 15 * contact TMate Software at support@hg4j.com | 
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changeset | 16 */ | 
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changeset | 17 package org.tmatesoft.hg.internal; | 
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changeset | 18 | 
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changeset | 19 import java.io.ByteArrayOutputStream; | 
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changeset | 20 | 
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changeset | 21 import org.tmatesoft.hg.core.HgIOException; | 
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changeset | 22 import org.tmatesoft.hg.repo.HgRuntimeException; | 
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changeset | 23 | 
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changeset | 24 /** | 
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changeset | 25 * Serialization friend of {@link DataAccess} | 
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changeset | 26 * | 
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changeset | 27 * @author Artem Tikhomirov | 
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changeset | 28 * @author TMate Software Ltd. | 
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changeset | 29 */ | 
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changeset | 30 @Experimental(reason="Work in progress") | 
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changeset | 31 public class DataSerializer { | 
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changeset | 32 private byte[] buffer; | 
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changeset | 33 | 
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changeset | 34 public void writeByte(byte... values) throws HgIOException { | 
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changeset | 35 write(values, 0, values.length); | 
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changeset | 36 } | 
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changeset | 37 | 
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changeset | 38 public void writeInt(int... values) throws HgIOException { | 
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changeset | 39 ensureBufferSize(4*values.length); // sizeof(int) | 
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changeset | 40 int idx = 0; | 
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changeset | 41 for (int v : values) { | 
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changeset | 42 bigEndian(v, buffer, idx); | 
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changeset | 43 idx += 4; | 
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changeset | 44 } | 
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changeset | 45 write(buffer, 0, idx); | 
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changeset | 46 } | 
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changeset | 47 | 
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changeset | 48 public void write(byte[] data, int offset, int length) throws HgIOException { | 
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changeset | 49 throw new HgIOException("Attempt to write to non-existent file", null); | 
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changeset | 50 } | 
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changeset | 51 | 
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changeset | 52 public void done() throws HgIOException { | 
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changeset | 53 // no-op | 
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changeset | 54 } | 
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changeset | 55 | 
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changeset | 56 private void ensureBufferSize(int bytesNeeded) { | 
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changeset | 57 if (buffer == null || buffer.length < bytesNeeded) { | 
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changeset | 58 buffer = new byte[bytesNeeded]; | 
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changeset | 59 } | 
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changeset | 60 } | 
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changeset | 61 | 
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changeset | 62 /** | 
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changeset | 63 * Writes 4 bytes of supplied value into the buffer at given offset, big-endian. | 
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changeset | 64 */ | 
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changeset | 65 public static final void bigEndian(int value, byte[] buffer, int offset) { | 
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changeset | 66 assert offset + 4 <= buffer.length; | 
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changeset | 67 buffer[offset++] = (byte) ((value >>> 24) & 0x0ff); | 
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changeset | 68 buffer[offset++] = (byte) ((value >>> 16) & 0x0ff); | 
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changeset | 69 buffer[offset++] = (byte) ((value >>> 8) & 0x0ff); | 
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changeset | 70 buffer[offset++] = (byte) (value & 0x0ff); | 
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changeset | 71 } | 
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changeset | 72 | 
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changeset | 73 /** | 
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changeset | 74 * Denotes an entity that wants to/could be serialized | 
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changeset | 75 */ | 
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changeset | 76 @Experimental(reason="Work in progress") | 
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changeset | 77 interface DataSource { | 
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changeset | 78 /** | 
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changeset | 79 * Invoked once for a single write operation, | 
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changeset | 80 * although the source itself may get serialized several times | 
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changeset | 81 */ | 
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changeset | 82 public void serialize(DataSerializer out) throws HgIOException, HgRuntimeException; | 
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changeset | 83 | 
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changeset | 84 /** | 
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changeset | 85 * Hint of data length it would like to writes | 
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changeset | 86 * @return -1 if can't answer | 
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changeset | 87 */ | 
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changeset | 88 public int serializeLength() throws HgRuntimeException; | 
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changeset | 89 } | 
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changeset | 90 | 
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changeset | 91 public static class ByteArrayDataSource implements DataSource { | 
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changeset | 92 | 
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changeset | 93 private final byte[] data; | 
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changeset | 94 | 
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changeset | 95 public ByteArrayDataSource(byte[] bytes) { | 
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changeset | 96 data = bytes; | 
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changeset | 97 } | 
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changeset | 98 | 
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changeset | 99 public void serialize(DataSerializer out) throws HgIOException { | 
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changeset | 100 if (data != null) { | 
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changeset | 101 out.write(data, 0, data.length); | 
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changeset | 102 } | 
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changeset | 103 } | 
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changeset | 104 | 
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changeset | 105 public int serializeLength() { | 
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changeset | 106 return data == null ? 0 : data.length; | 
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changeset | 107 } | 
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changeset | 108 } | 
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changeset | 109 | 
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changeset | 110 public static class ByteArrayDataSerializer extends DataSerializer { | 
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changeset | 111 private final ByteArrayOutputStream out = new ByteArrayOutputStream(); | 
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changeset | 112 | 
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changeset | 113 @Override | 
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changeset | 114 public void write(byte[] data, int offset, int length) { | 
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changeset | 115 out.write(data, offset, length); | 
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changeset | 116 } | 
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changeset | 117 | 
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changeset | 118 public byte[] toByteArray() { | 
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changeset | 119 return out.toByteArray(); | 
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changeset | 120 } | 
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changeset | 121 } | 
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changeset | 122 } | 
