ActiveIO - 1.0

Clover coverage report - ActiveIO - 1.0 Coverage timestamp: Fri Apr 22 2005 14:27:22 PDT FRAMES NO FRAMES |
file stats: | LOC: | 148 |  | Methods: | 11
| NCLOC: | 96 |  | Classes: | 1
30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover
Source file | Conditionals | Statements | Methods | TOTAL
LogFile.java | 58.3% | 78% | 100% | 78.1% |

1 |  |
     /**
2 |  |
      *
3 |  |
      * Copyright 2004 Hiram Chirino
4 |  |
      *
5 |  |
      * Licensed under the Apache License, Version 2.0 (the "License");
6 |  |
      * you may not use this file except in compliance with the License.
7 |  |
      * You may obtain a copy of the License at
8 |  |
      *
9 |  |
      * http://www.apache.org/licenses/LICENSE-2.0
10 |  |
      *
11 |  |
      * Unless required by applicable law or agreed to in writing, software
12 |  |
      * distributed under the License is distributed on an "AS IS" BASIS,
13 |  |
      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 |  |
      * See the License for the specific language governing permissions and
15 |  |
      * limitations under the License.
16 |  |
      *
17 |  |
      **/
18 |  |
     package org.activeio.journal.active;
19 |  |
20 |  |
     import java.io.File;
21 |  |
     import java.io.IOException;
22 |  |
     import java.io.RandomAccessFile;
23 |  |
     import java.nio.ByteBuffer;
24 |  |
     import java.nio.channels.FileChannel;
25 |  |
26 |  |
     import org.activeio.Disposable;
27 |  |
28 |  |
     /**
29 |  |
      * Allows read/append access to a LogFile.
30 |  |
      *
31 |  |
      * @version $Revision: 1.1 $
32 |  |
      */
33 |  |
     final public class LogFile implements Disposable {
34 |  |
35 |  |
         private final RandomAccessFile file;
36 |  |
         private final FileChannel channel;
37 |  |
38 |  |
         /** Prefered size. The size that the log file is set to when initilaized. */
39 |  |
         private final int initialSize;
40 |  |
41 |  |
         /** Where the we are in the file right now */
42 |  |
         private int currentOffset;
43 |  |
         private boolean disposed;
44 |  |
45 | 40 |
         public LogFile(File file, int initialSize) throws IOException {
46 | 40 |
             this.initialSize = initialSize;
47 | 40 |
             boolean initializationNeeeded = !file.exists();
48 | 40 |
             this.file = new RandomAccessFile(file, "rw");
49 | 40 |
             channel = this.file.getChannel();
50 | 40 |
             if( initializationNeeeded )
51 | 40 |
                 resize();
52 | 40 |
             channel.position(0);
53 | 40 |
             reloadCurrentOffset();
54 |  |
         }
55 |  |
56 |  |
         /**
57 |  |
          * To avoid doing un-needed seeks.
58 |  |
          */
59 | 72 |
         private void seek(int offset) throws IOException {
60 | 72 |
             if( offset == currentOffset ) {
61 | 36 |
                 if( currentOffset != channel.position() )
62 | 0 |
                     throw new RuntimeException(" "+currentOffset+", "+channel.position() );
63 | 36 |
                 return;
64 |  |
             }
65 | 36 |
             channel.position(offset);
66 | 36 |
             currentOffset = offset;
67 |  |
         }
68 | 50 |
         private void reloadCurrentOffset() throws IOException {
69 | 50 |
             currentOffset= (int) channel.position();
70 |  |
         }
71 | 62 |
         private void addToCurrentOffset(int rc) {
72 | 62 |
             currentOffset+=rc;
73 |  |
         }
74 |  |
75 | 10 |
         public boolean loadAndCheckRecord(int offset, Record record) throws IOException {
76 |  |
77 | 10 |
             try {
78 |  |
                 // Read the next header
79 | 10 |
                 seek(offset);
80 | 10 |
                 record.readHeader(file);
81 |  |
82 | 0 |
                 if (Record.isChecksumingEnabled()) {
83 | 0 |
                     record.checksum(file);
84 |  |
                 }
85 |  |
                 // Load the footer.
86 | 0 |
                 seek(offset+record.getPayloadLength()+Record.RECORD_HEADER_SIZE);
87 | 0 |
                 record.readFooter(file);
88 |  |
89 | 0 |
                 addToCurrentOffset(record.getRecordLength());
90 | 0 |
                 return true;
91 |  |
92 |  |
             } catch (IOException e) {
93 | 10 |
                 reloadCurrentOffset();
94 | 10 |
                 return false;
95 |  |
             }
96 |  |
         }
97 |  |
98 | 40 |
         public void resize() throws IOException {
99 | 40 |
             file.setLength(initialSize);
100 |  |
         }
101 |  |
102 | 16 |
         public void force() throws IOException {
103 | 16 |
             channel.force(false);
104 |  |
         }
105 |  |
106 | 40 |
         public void dispose() {
107 | 40 |
             if( disposed )
108 | 0 |
                 return;
109 | 40 |
             disposed=true;
110 | 40 |
             try {
111 | 40 |
                 this.file.close();
112 |  |
             } catch (IOException e) {
113 |  |
             }
114 |  |
         }
115 |  |
116 | 20 |
         public void write(int offset, ByteBuffer buffer) throws IOException {
117 |  |
118 | 20 |
             try {
119 |  |
120 | 20 |
                 int size = buffer.remaining();
121 | 20 |
                 seek(offset);
122 | 20 |
                 while (buffer.hasRemaining()) {
123 | 20 |
                     channel.write(buffer);
124 |  |
                 }
125 | 20 |
                 addToCurrentOffset(size);
126 |  |
127 |  |
             } catch (IOException e) {
128 | 0 |
                 reloadCurrentOffset();
129 |  |
             }
130 |  |
         }
131 |  |
132 | 30 |
         public void readRecordHeader(int offset, Record record) throws IOException {
133 | 30 |
             seek(offset);
134 | 30 |
             try {
135 | 30 |
                 record.readHeader(file);
136 |  |
             } catch ( IOException e ) {
137 | 0 |
                 reloadCurrentOffset();
138 | 0 |
                 throw e;
139 |  |
             }
140 | 30 |
             addToCurrentOffset(Record.RECORD_HEADER_SIZE);
141 |  |
         }
142 |  |
143 | 12 |
         public void read(int offset, byte[] answer) throws IOException {
144 | 12 |
             seek(offset);
145 | 12 |
             file.readFully(answer);
146 | 12 |
             addToCurrentOffset(answer.length);
147 |  |
         }
148 |  |
     }