Clover coverage report - ActiveIO - 1.0
Coverage timestamp: Fri Apr 22 2005 14:27:22 PDT
file stats: LOC: 193   Methods: 12
NCLOC: 128   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
AsynchChannelToConcurrentRequestChannel.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.adapter;
 18   
 
 19   
 import java.io.IOException;
 20   
 import java.io.InterruptedIOException;
 21   
 
 22   
 import org.activeio.AsynchChannel;
 23   
 import org.activeio.ChannelFactory;
 24   
 import org.activeio.FilterAsynchChannel;
 25   
 import org.activeio.Packet;
 26   
 import org.activeio.PacketData;
 27   
 import org.activeio.RequestChannel;
 28   
 import org.activeio.RequestListener;
 29   
 import org.activeio.packet.AppendedPacket;
 30   
 import org.activeio.packet.ByteArrayPacket;
 31   
 
 32   
 import EDU.oswego.cs.dl.util.concurrent.ConcurrentHashMap;
 33   
 import EDU.oswego.cs.dl.util.concurrent.Executor;
 34   
 import EDU.oswego.cs.dl.util.concurrent.Slot;
 35   
 
 36   
 
 37   
 /**
 38   
  * Creates a {@see org.activeio.RequestChannel} out of a {@see org.activeio.AsynchChannel}.  This 
 39   
  * {@see org.activeio.RequestChannel} is thread safe and mutiplexes concurrent requests and responses over
 40   
  * the underlying {@see org.activeio.AsynchChannel}.
 41   
  * 
 42   
  * @version $Revision$
 43   
  */
 44   
 final public class AsynchChannelToConcurrentRequestChannel extends FilterAsynchChannel implements RequestChannel {
 45   
 
 46   
     private static final byte PASSTHROUGH = 0x00;
 47   
     private static final byte REQUEST = 0x01;
 48   
     private static final byte RESPONSE = 0x02;    
 49   
     private static final ByteArrayPacket PASSTHROUGH_PACKET = new ByteArrayPacket(new byte[]{PASSTHROUGH});
 50   
     
 51   
     private final ConcurrentHashMap requestMap = new ConcurrentHashMap();
 52   
     private final Executor requestExecutor;
 53   
     private short nextRequestId = 0;
 54   
     private final Object writeMutex = new Object();
 55   
     
 56   
     private RequestListener requestListener;
 57   
     
 58  0
     public AsynchChannelToConcurrentRequestChannel(AsynchChannel next) {
 59  0
         this(next, ChannelFactory.DEFAULT_EXECUTOR);
 60   
     }
 61   
 
 62  0
     public AsynchChannelToConcurrentRequestChannel(AsynchChannel next, Executor requestExecutor) {
 63  0
         super(next);
 64  0
         this.requestExecutor=requestExecutor;
 65   
     }
 66   
     
 67  0
     synchronized short getNextRequestId() {
 68  0
         return nextRequestId++;
 69   
     }
 70   
 
 71   
     /**
 72   
      * @see org.activeio.FilterAsynchChannel#write(org.activeio.channel.Packet)
 73   
      */
 74  0
     public void write(Packet packet) throws IOException {
 75  0
         Packet passThrough = AppendedPacket.join(PASSTHROUGH_PACKET.duplicate(), packet);
 76  0
         synchronized(writeMutex) {
 77  0
             super.write(passThrough);
 78   
         }
 79   
     }
 80   
 
 81   
     /**
 82   
      * @see org.activeio.FilterAsynchChannel#onPacket(org.activeio.channel.Packet)
 83   
      */
 84  0
     public void onPacket(final Packet packet) {
 85  0
             switch( packet.read() ) {
 86   
                 case PASSTHROUGH:
 87  0
                     super.onPacket(packet);
 88  0
                     break;
 89   
                 case REQUEST:
 90  0
                     try {
 91  0
                         requestExecutor.execute(new Runnable(){
 92  0
                             public void run() {
 93  0
                                 serviceRequest(packet);
 94   
                             }
 95   
                         });
 96   
                     } catch (InterruptedException e) {
 97  0
                         Thread.currentThread().interrupt();
 98   
                     }
 99  0
                     break;
 100   
                 case RESPONSE:
 101  0
                     serviceReponse(packet);
 102  0
                     break;
 103   
             }
 104   
     }
 105   
 
 106  0
     private void serviceRequest(Packet packet) {
 107  0
         try {
 108  0
             if( requestListener ==null )
 109  0
                 throw new IOException("The RequestListener has not been set.");
 110   
 
 111  0
             PacketData data = new PacketData(packet);
 112  0
             short requestId = data.readShort();            
 113  0
             Packet reponse = requestListener.onRequest(packet);
 114   
 
 115   
             // Send the response...
 116  0
             Packet header = createHeaderPacket(RESPONSE, requestId);        
 117  0
             Packet rc = AppendedPacket.join(header, packet);        
 118  0
             synchronized(writeMutex) {
 119  0
                 super.write(rc);
 120   
             }
 121   
         } catch (IOException e) {
 122  0
             super.onPacketError(e);
 123   
         }
 124   
         
 125   
     }
 126   
 
 127  0
     private void serviceReponse(Packet packet) {
 128   
         
 129  0
         try {
 130   
             
 131  0
             PacketData data = new PacketData(packet);
 132  0
             short requestId = data.readShort();
 133   
             
 134  0
             Slot responseSlot = (Slot) requestMap.get(new Short(requestId));
 135  0
             responseSlot.put(packet);
 136   
             
 137   
         } catch (IOException e) {
 138  0
             super.onPacketError(e);
 139   
         } catch (InterruptedException e) {
 140  0
             Thread.currentThread().interrupt();
 141   
         }
 142   
         
 143   
         
 144   
     }
 145   
 
 146  0
     public Packet request(Packet request, long timeout) throws IOException {
 147   
         
 148  0
         Short requestId = new Short(getNextRequestId());
 149  0
         Slot responseSlot = new Slot();
 150  0
         requestMap.put(requestId, responseSlot);
 151   
         
 152  0
         Packet header = createHeaderPacket(REQUEST, requestId.shortValue());        
 153  0
         Packet packet = AppendedPacket.join(header, request);
 154   
         
 155  0
         synchronized(writeMutex) {
 156  0
             super.write(packet);
 157   
         }
 158   
         
 159  0
         try {
 160   
             
 161  0
             if( timeout == WAIT_FOREVER_TIMEOUT ) {
 162  0
                 return (Packet) responseSlot.take();                
 163  0
             } else if (timeout == NO_WAIT_TIMEOUT ) {
 164  0
                 return (Packet) responseSlot.poll(1);                                
 165   
             } else {
 166  0
                 return (Packet) responseSlot.poll(timeout);                                
 167   
             }
 168   
             
 169   
         } catch (InterruptedException e) {
 170  0
             throw new InterruptedIOException(e.getMessage());
 171   
         } finally {
 172  0
             requestMap.remove(requestId);
 173   
         }        
 174   
     }
 175   
 
 176  0
     private Packet createHeaderPacket(byte type, short requestId) throws IOException {
 177  0
         ByteArrayPacket header = new ByteArrayPacket(new byte[]{3});
 178  0
         PacketData data = new PacketData(header);
 179  0
         data.writeByte(type);
 180  0
         data.writeShort(requestId);
 181  0
         header.flip();
 182  0
         return header;
 183   
     }
 184   
 
 185  0
     public void setRequestListener(RequestListener requestListener) throws IOException {
 186  0
         this.requestListener = requestListener;        
 187   
     }
 188   
 
 189  0
     public RequestListener getRequestListener() {
 190  0
         return requestListener;
 191   
     }
 192   
 }
 193