Clover coverage report - ActiveIO - 1.0 Coverage timestamp: Fri Apr 22 2005 14:27:22 PDT FRAMES NO FRAMES |
file stats: | LOC: | 119 |  | Methods: | 8
| NCLOC: | 61 |  | Classes: | 2
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Source file | Conditionals | Statements | Methods | TOTAL
PacketPool.java | 70% | 87.5% | 75% | 81% |

1 |  |
     /**
2 |  |
      *
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      * Copyright 2004 Hiram Chirino
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      *
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      * Licensed under the Apache License, Version 2.0 (the "License");
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      * you may not use this file except in compliance with the License.
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      * You may obtain a copy of the License at
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      *
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      * http://www.apache.org/licenses/LICENSE-2.0
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      *
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      * Unless required by applicable law or agreed to in writing, software
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      * distributed under the License is distributed on an "AS IS" BASIS,
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      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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      * See the License for the specific language governing permissions and
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      * limitations under the License.
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      *
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      **/
18 |  |
     package org.activeio.packet;
19 |  |
20 |  |
     import java.util.ArrayList;
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22 |  |
     import org.activeio.Packet;
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24 |  |
     import EDU.oswego.cs.dl.util.concurrent.SynchronizedInt;
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26 |  |
     /**
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      * Provides a simple pool of Packet objects.  When the packets that this pool produces are disposed,
28 |  |
      * they are returned to the pool.
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      *
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      * @version $Revision: 1.1 $
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      */
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     abstract public class PacketPool {
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34 |  |
         public static final int DEFAULT_POOL_SIZE = Integer.parseInt(System.getProperty("org.activeio.journal.active.DefaultPoolSize", ""+(5)));
35 |  |
         public static final int DEFAULT_PACKET_SIZE = Integer.parseInt(System.getProperty("org.activeio.journal.active.DefaultPacketSize", ""+(1024*1024*4)));
36 |  |
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         private final ArrayList pool = new ArrayList();
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         private final int maxPackets;
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         private int currentPoolSize;
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41 |  |
         public class PooledPacket extends FilterPacket {
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             private final SynchronizedInt referenceCounter;
43 |  |
44 | 4 |
             public PooledPacket(Packet next) {
45 | 4 |
                 this(next, new SynchronizedInt(0));
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             }
47 |  |
48 | 4 |
             private PooledPacket(Packet next, SynchronizedInt referenceCounter) {
49 | 4 |
                 super(next);
50 | 4 |
                 this.referenceCounter=referenceCounter;
51 | 4 |
                 this.referenceCounter.increment();
52 |  |
             }
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54 | 0 |
             public Packet filter(Packet packet) {
55 | 0 |
                 return new PooledPacket(next, referenceCounter);
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             }
57 |  |
58 | 0 |
             int getReferenceCounter() {
59 | 0 |
                 return referenceCounter.get();
60 |  |
             }
61 |  |
62 | 4 |
             public void dispose() {
63 | 4 |
                 if( referenceCounter.decrement()==0 ) {
64 | 4 |
                     returnPacket(next);
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                 }
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             }
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         }
68 |  |
69 |  |
         /**
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          * @param maxPackets the number of buffers that will be in the pool.
71 |  |
          */
72 | 4 |
         public PacketPool(int maxPackets) {
73 | 4 |
             this.maxPackets = maxPackets;
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         }
75 |  |
76 |  |
         /**
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          * Blocks until a ByteBuffer can be retreived from the pool.
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          *
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          * @return
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          * @throws InterruptedException
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          */
82 | 4 |
         public Packet getPacket() throws InterruptedException {
83 | 4 |
             Packet answer=null;
84 | 4 |
             synchronized(this) {
85 | 4 |
                 while(answer==null) {
86 | 4 |
                     if( pool.size()>0) {
87 | 1 |
                         answer = (Packet) pool.remove(pool.size()-1);
88 | 3 |
                     } else if( currentPoolSize < maxPackets ) {
89 | 3 |
                          answer = allocateNewPacket();
90 | 3 |
                          currentPoolSize++;
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                      }
92 | 4 |
                     if( answer==null ) {
93 | 0 |
                         this.wait();
94 |  |
                     }
95 |  |
                 }
96 |  |
             }
97 | 4 |
             return new PooledPacket(answer);
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         }
99 |  |
100 |  |
         /**
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          * Returns a ByteBuffer to the pool.
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          *
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          * @param packet
104 |  |
          */
105 | 4 |
         private void returnPacket(Packet packet) {
106 | 4 |
             packet.clear();
107 | 4 |
             synchronized(this) {
108 | 4 |
                 pool.add(packet);
109 | 4 |
                 this.notify();
110 |  |
             }
111 |  |
         }
112 |  |
113 |  |
         /**
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          * @return
115 |  |
          */
116 |  |
         abstract protected Packet allocateNewPacket();
117 |  |
118 |  |
     }
119 |  |