Clover coverage report - ActiveIO - 1.0
Coverage timestamp: Fri Apr 22 2005 14:27:22 PDT
Overview   Package   File
    FRAMES   NO FRAMES  
file stats: LOC: 158   Methods: 7
NCLOC: 99   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
ControlFile.java 35.7% 62.1% 100% 60.8%
coverage coverage
 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    
 import java.nio.channels.FileLock;
 26    
 
 27    
 import org.activeio.Disposable;
 28    
 import org.activeio.Packet;
 29    
 import org.activeio.packet.ByteBufferPacket;
 30    
 
 31    
 /**
 32    
  * Control file holds the last known good state of the journal.  It stores the state in
 33    
  * record that is versioned and repeated twice in the file so that a failure in the
 34    
  * middle of the write of the first or second record do not not result in an unknown
 35    
  * state.
 36    
  *
 37    
  * @version $Revision: 1.1 $
 38    
  */
 39    
 final public class ControlFile implements Disposable {
 40    
 
 41    
     /** The File that holds the control data. */
 42    
     private final RandomAccessFile file;
 43    
     private final FileChannel channel;
 44    
     private final ByteBufferPacket controlData;
 45    
 
 46    
     private long controlDataVersion=0;
 47    
     private FileLock lock;
 48    
     private boolean disposed;
 49    
 
 50  10 
     public ControlFile(File fileName, int controlDataSize) throws IOException {
 51    
 
 52  10 
         boolean existed = fileName.exists();
 53  10 
         file = new RandomAccessFile(fileName, "rw");
 54  10 
         channel = file.getChannel();
 55  10 
         controlData = new ByteBufferPacket(ByteBuffer.allocateDirect(controlDataSize));
 56    
 
 57    
     }
 58    
 
 59    
     /**
 60    
      * Locks the control file.
 61    
      * @throws IOException
 62    
      */
 63  10 
     public void lock() throws IOException {
 64  10 
         if( lock==null ) {
 65  10 
             lock = channel.tryLock();
 66  10 
             if( lock ==null )
 67  0 
                 throw new IOException("Journal is allready opened by another application");
 68    
         }
 69    
     }
 70    
 
 71    
     /**
 72    
      * Un locks the control file.
 73    
      * @throws IOException
 74    
      */
 75  10 
     public void unlock() throws IOException {
 76  10 
         if( lock != null ) {
 77  10 
             lock.release();
 78  10 
             lock=null;
 79    
         }
 80    
     }
 81    
 
 82  10 
     public boolean load() throws IOException {
 83  10 
         long l = file.length();
 84  10 
         if( l < controlData.capacity() ) {
 85  10 
             controlDataVersion=0;
 86  10 
             controlData.position(0);
 87  10 
             controlData.limit(0);
 88  10 
             return false;
 89    
         } else {
 90  0 
             file.seek(0);
 91  0 
             long v1 = file.readLong();
 92  0 
             file.seek(controlData.capacity()+8);
 93  0 
             long v1check = file.readLong();
 94    
 
 95  0 
             file.seek(controlData.capacity()+16);
 96  0 
             long v2 = file.readLong();
 97  0 
             file.seek((controlData.capacity()*2)+24);
 98  0 
             long v2check = file.readLong();
 99    
 
 100  0 
             if( v2 == v2check ) {
 101  0 
                 controlDataVersion = v2;
 102  0 
                 file.seek(controlData.capacity()+24);
 103  0 
                 controlData.clear();
 104  0 
                 channel.read(controlData.getByteBuffer());
 105  0 
             } else if ( v1 == v1check ){
 106  0 
                 controlDataVersion = v1;
 107  0 
                 file.seek(controlData.capacity()+8);
 108  0 
                 controlData.clear();
 109  0 
                 channel.read(controlData.getByteBuffer());
 110    
             } else {
 111    
                 // Bummer.. Both checks are screwed. we don't know
 112    
                 // if any of the two buffer are ok.  This should
 113    
                 // only happen is data got corrupted.
 114  0 
                 throw new IOException("Control data corrupted.");
 115    
             }
 116  0 
             return true;
 117    
         }
 118    
     }
 119    
 
 120  36 
     public void store() throws IOException {
 121  36 
         controlDataVersion++;
 122  36 
         file.setLength((controlData.capacity()*2)+32);
 123  36 
         file.seek(0);
 124    
 
 125    
         // Write the first copy of the control data.
 126  36 
         file.writeLong(controlDataVersion);
 127  36 
         controlData.clear();
 128  36 
         channel.write(controlData.getByteBuffer());
 129  36 
         file.writeLong(controlDataVersion);
 130    
 
 131    
         // Write the second copy of the control data.
 132  36 
         file.writeLong(controlDataVersion);
 133  36 
         controlData.clear();
 134  36 
         channel.write(controlData.getByteBuffer());
 135  36 
         file.writeLong(controlDataVersion);
 136    
 
 137  36 
         channel.force(false);
 138    
     }
 139    
 
 140  36 
     public Packet getControlData() {
 141  36 
         controlData.clear();
 142  36 
         return controlData;
 143    
     }
 144    
 
 145  10 
     public void dispose() {
 146  10 
         if( disposed )
 147  0 
             return;
 148  10 
         disposed=true;
 149  10 
         try {
 150  10 
             unlock();
 151    
         } catch (IOException e) {
 152    
         }
 153  10 
         try {
 154  10 
             file.close();
 155    
         } catch (IOException e) {
 156    
         }
 157    
     }
 158    
 }
 
CloverReport generated by Clover v1.2.3
Fri Apr 22 2005 14:27:23 PDT.		   30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it.