Mercurial > hg > blitz_stable

annotate src/org/prevayler/implementation/DelegatingByteCountStream2.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /*
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2 The copyright of all source code included in this Prevayler distribution is
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3 held by Klaus Wuestefeld, except the files that specifically state otherwise.
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4 All rights are reserved. "PREVAYLER" is a trademark of Klaus Wuestefeld.
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5
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6
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7 BSD License:
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8
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9 Redistribution and use in source and binary forms, with or without
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10 modification, are permitted provided that the following conditions are met:
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11
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12 - Redistributions of source code must retain the above copyright notice, this
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13 list of conditions and the following disclaimer.
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14
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15 - Redistributions in binary form must reproduce the above copyright notice,
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16 this list of conditions and the following disclaimer in the documentation
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17 and/or other materials provided with the distribution.
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18
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19 - Neither the name of Prevayler nor the names of its contributors may be used
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20 to endorse or promote products derived from this software without specific
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21 prior written permission.
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22
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23
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24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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25 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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26 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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27 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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28 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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29 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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30 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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31 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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32 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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33 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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34 POSSIBILITY OF SUCH DAMAGE.
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35 */
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36
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37 package org.prevayler.implementation;
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38
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39 import org.dancres.blitz.txn.TxnManager;
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40
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41 import java.io.*;
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42 import java.util.logging.Level;
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43
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44 /**
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45 A FileOutputStream that counts the number of bytes written and forces all
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46 buffers to synchronize with the underlying device when flushed.
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47 */
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48 final class DelegatingByteCountStream2 extends OutputStream {
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49 private ByteArrayOutputStream theBuffer = new ByteArrayOutputStream();
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50 private RandomAccessFile theFile;
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51 private int theBufferSize;
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52
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53 DelegatingByteCountStream2(File file, int aBufferSize)
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54 throws IOException {
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55
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56 // System.err.println("Buffer size: " + aBufferSize);
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57
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58 // TxnManager.theLogger.log(Level.SEVERE, "Open: " + file);
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59
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60 theFile = new RandomAccessFile(file, "rwd");
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61
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62 theBufferSize = aBufferSize;
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63 }
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64
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65 public void close() throws IOException {
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66 // TxnManager.theLogger.log(Level.SEVERE, "Close log");
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67
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68 flush();
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69 theFile.close();
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70 }
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71
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72 public void flush() throws IOException {
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73 // System.err.println("Flush");
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74
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75 byte[] myBytes = theBuffer.toByteArray();
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76 theBuffer.reset();
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77
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78 // File was opened in "rwd" mode so we need do no more than write
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79 //
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80 theFile.write(myBytes);
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81 }
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82
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83 public void write(byte[] b) throws IOException {
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84 theBuffer.write(b);
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85 bytesWritten += b.length;
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86
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87 checkBuffer();
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88 }
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89
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90 public void write(byte[] b, int off, int len) throws IOException {
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91 theBuffer.write(b, off, len);
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92 bytesWritten += len;
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93
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94 checkBuffer();
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95 }
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96
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97 public void write(int b) throws IOException {
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98 theBuffer.write(b);
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99 ++bytesWritten;
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100
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101 checkBuffer();
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102 }
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103
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104 private void checkBuffer() throws IOException {
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105 if (theBuffer.size() > theBufferSize)
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106 flush();
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107 }
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108
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109 public long bytesWritten() {
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110 return bytesWritten;
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111 }
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112
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113 private long bytesWritten;
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114 }