Mercurial > hg > blitz_condensed
comparison 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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-1:000000000000 | 0:3dc0c5604566 |
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1 /* | |
2 The copyright of all source code included in this Prevayler distribution is | |
3 held by Klaus Wuestefeld, except the files that specifically state otherwise. | |
4 All rights are reserved. "PREVAYLER" is a trademark of Klaus Wuestefeld. | |
5 | |
6 | |
7 BSD License: | |
8 | |
9 Redistribution and use in source and binary forms, with or without | |
10 modification, are permitted provided that the following conditions are met: | |
11 | |
12 - Redistributions of source code must retain the above copyright notice, this | |
13 list of conditions and the following disclaimer. | |
14 | |
15 - Redistributions in binary form must reproduce the above copyright notice, | |
16 this list of conditions and the following disclaimer in the documentation | |
17 and/or other materials provided with the distribution. | |
18 | |
19 - Neither the name of Prevayler nor the names of its contributors may be used | |
20 to endorse or promote products derived from this software without specific | |
21 prior written permission. | |
22 | |
23 | |
24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
34 POSSIBILITY OF SUCH DAMAGE. | |
35 */ | |
36 | |
37 package org.prevayler.implementation; | |
38 | |
39 import org.dancres.blitz.txn.TxnManager; | |
40 | |
41 import java.io.*; | |
42 import java.util.logging.Level; | |
43 | |
44 /** | |
45 A FileOutputStream that counts the number of bytes written and forces all | |
46 buffers to synchronize with the underlying device when flushed. | |
47 */ | |
48 final class DelegatingByteCountStream2 extends OutputStream { | |
49 private ByteArrayOutputStream theBuffer = new ByteArrayOutputStream(); | |
50 private RandomAccessFile theFile; | |
51 private int theBufferSize; | |
52 | |
53 DelegatingByteCountStream2(File file, int aBufferSize) | |
54 throws IOException { | |
55 | |
56 // System.err.println("Buffer size: " + aBufferSize); | |
57 | |
58 // TxnManager.theLogger.log(Level.SEVERE, "Open: " + file); | |
59 | |
60 theFile = new RandomAccessFile(file, "rwd"); | |
61 | |
62 theBufferSize = aBufferSize; | |
63 } | |
64 | |
65 public void close() throws IOException { | |
66 // TxnManager.theLogger.log(Level.SEVERE, "Close log"); | |
67 | |
68 flush(); | |
69 theFile.close(); | |
70 } | |
71 | |
72 public void flush() throws IOException { | |
73 // System.err.println("Flush"); | |
74 | |
75 byte[] myBytes = theBuffer.toByteArray(); | |
76 theBuffer.reset(); | |
77 | |
78 // File was opened in "rwd" mode so we need do no more than write | |
79 // | |
80 theFile.write(myBytes); | |
81 } | |
82 | |
83 public void write(byte[] b) throws IOException { | |
84 theBuffer.write(b); | |
85 bytesWritten += b.length; | |
86 | |
87 checkBuffer(); | |
88 } | |
89 | |
90 public void write(byte[] b, int off, int len) throws IOException { | |
91 theBuffer.write(b, off, len); | |
92 bytesWritten += len; | |
93 | |
94 checkBuffer(); | |
95 } | |
96 | |
97 public void write(int b) throws IOException { | |
98 theBuffer.write(b); | |
99 ++bytesWritten; | |
100 | |
101 checkBuffer(); | |
102 } | |
103 | |
104 private void checkBuffer() throws IOException { | |
105 if (theBuffer.size() > theBufferSize) | |
106 flush(); | |
107 } | |
108 | |
109 public long bytesWritten() { | |
110 return bytesWritten; | |
111 } | |
112 | |
113 private long bytesWritten; | |
114 } |