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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
PacketPool.java | 70% | 87.5% | 75% | 81% |
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/**
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*
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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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**/
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package org.activeio.packet;
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import java.util.ArrayList;
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import org.activeio.Packet;
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import EDU.oswego.cs.dl.util.concurrent.SynchronizedInt;
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/**
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* Provides a simple pool of Packet objects. When the packets that this pool produces are disposed,
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* 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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public static final int DEFAULT_POOL_SIZE = Integer.parseInt(System.getProperty("org.activeio.journal.active.DefaultPoolSize", ""+(5))); |
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public static final int DEFAULT_PACKET_SIZE = Integer.parseInt(System.getProperty("org.activeio.journal.active.DefaultPacketSize", ""+(1024*1024*4))); |
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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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public class PooledPacket extends FilterPacket { |
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private final SynchronizedInt referenceCounter;
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public PooledPacket(Packet next) {
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this(next, new SynchronizedInt(0)); |
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} |
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private PooledPacket(Packet next, SynchronizedInt referenceCounter) {
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super(next);
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this.referenceCounter=referenceCounter;
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this.referenceCounter.increment();
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} |
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public Packet filter(Packet packet) {
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return new PooledPacket(next, referenceCounter); |
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} |
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int getReferenceCounter() {
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return referenceCounter.get();
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} |
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public void dispose() { |
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if( referenceCounter.decrement()==0 ) {
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returnPacket(next); |
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} |
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} |
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} |
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/**
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* @param maxPackets the number of buffers that will be in the pool.
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*/
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public PacketPool(int maxPackets) { |
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this.maxPackets = maxPackets;
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} |
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/**
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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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*/
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public Packet getPacket() throws InterruptedException { |
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Packet answer=null;
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synchronized(this) { |
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while(answer==null) { |
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if( pool.size()>0) {
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answer = (Packet) pool.remove(pool.size()-1); |
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} else if( currentPoolSize < maxPackets ) { |
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answer = allocateNewPacket(); |
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currentPoolSize++; |
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} |
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if( answer==null ) { |
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this.wait();
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} |
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} |
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} |
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return new PooledPacket(answer); |
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} |
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/**
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* Returns a ByteBuffer to the pool.
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*
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* @param packet
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*/
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private void returnPacket(Packet packet) { |
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packet.clear(); |
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synchronized(this) { |
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pool.add(packet); |
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this.notify();
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} |
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} |
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/**
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* @return
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*/
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abstract protected Packet allocateNewPacket();
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} |
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