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

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Source file

Conditionals

Statements

Methods

TOTAL

LogFile.java

58.3%

78%

100%

78.1%

 /**
  *
  * Copyright 2004 Hiram Chirino
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  **/
 package org.activeio.journal.active;
 
 import java.io.File;
 import java.io.IOException;
 import java.io.RandomAccessFile;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 
 import org.activeio.Disposable;
 
 /**
  * Allows read/append access to a LogFile.
  * 
  * @version $Revision: 1.1 $
  */
 final public class LogFile implements Disposable {
 
     private final RandomAccessFile file;
     private final FileChannel channel;
 
     /** Prefered size. The size that the log file is set to when initilaized. */
     private final int initialSize;
 
     /** Where the we are in the file right now */
     private int currentOffset;
     private boolean disposed;
     
     public LogFile(File file, int initialSize) throws IOException {
         this.initialSize = initialSize;
         boolean initializationNeeeded = !file.exists();
         this.file = new RandomAccessFile(file, "rw");
         channel = this.file.getChannel();
         if( initializationNeeeded )
             resize();
         channel.position(0);
         reloadCurrentOffset();
     }
 
     /**
      * To avoid doing un-needed seeks.
      */
     private void seek(int offset) throws IOException {
         if( offset == currentOffset ) {
             if( currentOffset != channel.position() )
                 throw new RuntimeException(" "+currentOffset+", "+channel.position() );                
             return;
         }
         channel.position(offset);
         currentOffset = offset;
     }
     private void reloadCurrentOffset() throws IOException {
         currentOffset= (int) channel.position();
     }
     private void addToCurrentOffset(int rc) {
         currentOffset+=rc;
     }
     
     public boolean loadAndCheckRecord(int offset, Record record) throws IOException {
         
         try { 
             // Read the next header
             seek(offset);        
             record.readHeader(file);
                     
             if (Record.isChecksumingEnabled()) {
                 record.checksum(file);
             }            
             // Load the footer.
             seek(offset+record.getPayloadLength()+Record.RECORD_HEADER_SIZE);
             record.readFooter(file);
             
             addToCurrentOffset(record.getRecordLength());
             return true;
                 
         } catch (IOException e) {
             reloadCurrentOffset();
             return false;
         }
     }
     
     public void resize() throws IOException {
         file.setLength(initialSize);
     }
 
     public void force() throws IOException {
         channel.force(false);
     }
 
     public void dispose() {
         if( disposed )
             return;
         disposed=true;
         try {
             this.file.close();
         } catch (IOException e) {
         }
     }
 
     public void write(int offset, ByteBuffer buffer) throws IOException {
         
         try {
 
             int size = buffer.remaining();
             seek(offset);
             while (buffer.hasRemaining()) {
                 channel.write(buffer);                
             }
             addToCurrentOffset(size);
             
         } catch (IOException e) {
             reloadCurrentOffset();
         }
     }
 
     public void readRecordHeader(int offset, Record record) throws IOException {
         seek(offset);  
         try {
             record.readHeader(file);
         } catch ( IOException e ) {
             reloadCurrentOffset();
             throw e;
         }
         addToCurrentOffset(Record.RECORD_HEADER_SIZE);
     }
 
     public void read(int offset, byte[] answer) throws IOException {
         seek(offset);
         file.readFully(answer);
         addToCurrentOffset(answer.length);
     }
 }

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		}