Mercurial > hg > blitz_stable
annotate src/org/prevayler/implementation/DelegatingByteCountStream2.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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0
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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 } |