Clover coverage report - ActiveIO - 1.0
Coverage timestamp: Fri Apr 22 2005 14:27:22 PDT
file stats: LOC: 130   Methods: 11
NCLOC: 83   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
SynchornizedSynchChannel.java 0% 0% 0% 0%
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   
 package org.activeio.filter;
 18   
 
 19   
 import java.io.IOException;
 20   
 import java.io.InterruptedIOException;
 21   
 
 22   
 import org.activeio.FilterSynchChannel;
 23   
 import org.activeio.Packet;
 24   
 import org.activeio.SynchChannel;
 25   
 import org.activeio.SynchChannelServer;
 26   
 
 27   
 import EDU.oswego.cs.dl.util.concurrent.Mutex;
 28   
 import EDU.oswego.cs.dl.util.concurrent.Sync;
 29   
 
 30   
 /**
 31   
  * Used to synchronize concurrent access to a SynchChannel.  
 32   
  * 
 33   
  * Uses two different {@see EDU.oswego.cs.dl.util.concurrent.Sync} objects
 34   
  * for write and read operations.  All other operations such as {@see #stop(long)}
 35   
  * and {@see #stop} just do a normal java synchronization against the SynchornizedSynchChannel
 36   
  * object instance.
 37   
  * 
 38   
  */
 39   
 public class SynchornizedSynchChannel extends FilterSynchChannel {
 40   
 
 41   
     private final Sync readLock;
 42   
     private final Sync writeLock;
 43   
 
 44  0
     public SynchornizedSynchChannel(SynchChannel next) {
 45  0
         this(next, new Mutex(), new Mutex());
 46   
     }
 47   
     
 48  0
     public SynchornizedSynchChannel(SynchChannel next, Sync readLock, Sync writeLock) {
 49  0
         super(next);
 50  0
         this.readLock = readLock;
 51  0
         this.writeLock = writeLock;
 52   
     }
 53   
     
 54  0
     public Packet read(long timeout) throws IOException {
 55  0
         try {            
 56   
             
 57  0
             if( timeout==SynchChannelServer.WAIT_FOREVER_TIMEOUT ) {
 58  0
                 readLock.acquire();
 59   
             } else {
 60  0
                 long start = System.currentTimeMillis();
 61  0
                 if( !readLock.attempt(0) ) {
 62  0
                     return null;
 63   
                 }
 64   
                 // Adjust the resulting timeout down to account for time taken to 
 65   
                 // get the readLock.
 66  0
                 timeout = Math.max(0, timeout-(System.currentTimeMillis()-start));
 67   
             }
 68   
             
 69   
         } catch (InterruptedException e) {
 70  0
             throw new InterruptedIOException(e.getMessage());            
 71   
         }
 72   
         
 73  0
         try {
 74  0
             return getNext().read(timeout);            
 75   
         } finally {
 76  0
             readLock.release();
 77   
         }
 78   
     }
 79   
     
 80  0
     public void write(Packet packet) throws IOException {
 81  0
         try {                        
 82  0
             writeLock.acquire();
 83   
         } catch (InterruptedException e) {
 84  0
             throw new InterruptedIOException(e.getMessage());
 85   
         }
 86  0
         try {
 87  0
             getNext().write(packet);            
 88   
         } finally {
 89  0
             writeLock.release();
 90   
         }
 91   
     }
 92   
     
 93  0
     public void flush() throws IOException {
 94  0
         try {                        
 95  0
             writeLock.acquire();
 96   
         } catch (InterruptedException e) {
 97  0
             throw new InterruptedIOException(e.getMessage());
 98   
         }
 99  0
         try {
 100  0
             getNext().flush();            
 101   
         } finally {
 102  0
             writeLock.release();
 103   
         }
 104   
     }
 105   
 
 106  0
     synchronized public void dispose() {
 107  0
         super.dispose();
 108   
     }
 109   
 
 110  0
     synchronized public Object narrow(Class target) {
 111  0
         return super.narrow(target);
 112   
     }
 113   
 
 114  0
     synchronized public void start() throws IOException {
 115  0
         super.start();
 116   
     }
 117   
 
 118  0
     synchronized public void stop(long timeout) throws IOException {
 119  0
         super.stop(timeout);
 120   
     }
 121   
     
 122  0
     public Sync getReadLock() {
 123  0
         return readLock;
 124   
     }
 125   
     
 126  0
     public Sync getWriteLock() {
 127  0
         return writeLock;
 128   
     }
 129   
 }
 130