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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 | |||||||||||||||
AsynchChannelToConcurrentRequestChannel.java | 0% | 0% | 0% | 0% |
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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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package org.activeio.adapter;
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import java.io.IOException;
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import java.io.InterruptedIOException;
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import org.activeio.AsynchChannel;
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import org.activeio.ChannelFactory;
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import org.activeio.FilterAsynchChannel;
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import org.activeio.Packet;
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import org.activeio.PacketData;
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import org.activeio.RequestChannel;
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import org.activeio.RequestListener;
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import org.activeio.packet.AppendedPacket;
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import org.activeio.packet.ByteArrayPacket;
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import EDU.oswego.cs.dl.util.concurrent.ConcurrentHashMap;
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import EDU.oswego.cs.dl.util.concurrent.Executor;
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import EDU.oswego.cs.dl.util.concurrent.Slot;
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/**
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* Creates a {@see org.activeio.RequestChannel} out of a {@see org.activeio.AsynchChannel}. This
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* {@see org.activeio.RequestChannel} is thread safe and mutiplexes concurrent requests and responses over
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* the underlying {@see org.activeio.AsynchChannel}.
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*
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* @version $Revision$
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*/
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final public class AsynchChannelToConcurrentRequestChannel extends FilterAsynchChannel implements RequestChannel { |
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private static final byte PASSTHROUGH = 0x00; |
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private static final byte REQUEST = 0x01; |
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private static final byte RESPONSE = 0x02; |
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private static final ByteArrayPacket PASSTHROUGH_PACKET = new ByteArrayPacket(new byte[]{PASSTHROUGH}); |
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private final ConcurrentHashMap requestMap = new ConcurrentHashMap(); |
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private final Executor requestExecutor;
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private short nextRequestId = 0; |
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private final Object writeMutex = new Object(); |
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private RequestListener requestListener;
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public AsynchChannelToConcurrentRequestChannel(AsynchChannel next) {
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this(next, ChannelFactory.DEFAULT_EXECUTOR);
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} |
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public AsynchChannelToConcurrentRequestChannel(AsynchChannel next, Executor requestExecutor) {
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super(next);
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this.requestExecutor=requestExecutor;
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} |
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synchronized short getNextRequestId() { |
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return nextRequestId++;
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} |
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/**
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* @see org.activeio.FilterAsynchChannel#write(org.activeio.channel.Packet)
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*/
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public void write(Packet packet) throws IOException { |
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Packet passThrough = AppendedPacket.join(PASSTHROUGH_PACKET.duplicate(), packet); |
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synchronized(writeMutex) {
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super.write(passThrough);
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} |
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} |
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/**
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* @see org.activeio.FilterAsynchChannel#onPacket(org.activeio.channel.Packet)
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*/
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public void onPacket(final Packet packet) { |
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switch( packet.read() ) {
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case PASSTHROUGH:
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super.onPacket(packet);
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break;
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case REQUEST:
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try {
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requestExecutor.execute(new Runnable(){
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public void run() { |
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serviceRequest(packet); |
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} |
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}); |
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt(); |
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} |
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break;
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case RESPONSE:
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serviceReponse(packet); |
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break;
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} |
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} |
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private void serviceRequest(Packet packet) { |
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try {
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if( requestListener ==null ) |
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throw new IOException("The RequestListener has not been set."); |
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PacketData data = new PacketData(packet);
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short requestId = data.readShort();
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Packet reponse = requestListener.onRequest(packet); |
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// Send the response...
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Packet header = createHeaderPacket(RESPONSE, requestId); |
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Packet rc = AppendedPacket.join(header, packet); |
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synchronized(writeMutex) {
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super.write(rc);
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} |
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} catch (IOException e) {
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super.onPacketError(e);
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} |
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} |
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private void serviceReponse(Packet packet) { |
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try {
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PacketData data = new PacketData(packet);
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short requestId = data.readShort();
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Slot responseSlot = (Slot) requestMap.get(new Short(requestId));
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responseSlot.put(packet); |
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} catch (IOException e) {
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super.onPacketError(e);
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt(); |
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} |
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} |
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public Packet request(Packet request, long timeout) throws IOException { |
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Short requestId = new Short(getNextRequestId());
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Slot responseSlot = new Slot();
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requestMap.put(requestId, responseSlot); |
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Packet header = createHeaderPacket(REQUEST, requestId.shortValue()); |
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Packet packet = AppendedPacket.join(header, request); |
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synchronized(writeMutex) {
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super.write(packet);
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} |
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try {
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if( timeout == WAIT_FOREVER_TIMEOUT ) {
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return (Packet) responseSlot.take();
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} else if (timeout == NO_WAIT_TIMEOUT ) { |
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return (Packet) responseSlot.poll(1);
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} else {
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return (Packet) responseSlot.poll(timeout);
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} |
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} catch (InterruptedException e) {
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throw new InterruptedIOException(e.getMessage()); |
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} finally {
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requestMap.remove(requestId); |
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} |
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} |
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private Packet createHeaderPacket(byte type, short requestId) throws IOException { |
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ByteArrayPacket header = new ByteArrayPacket(new byte[]{3}); |
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PacketData data = new PacketData(header);
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data.writeByte(type); |
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data.writeShort(requestId); |
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header.flip(); |
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return header;
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} |
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185 | 0 |
public void setRequestListener(RequestListener requestListener) throws IOException { |
186 | 0 |
this.requestListener = requestListener;
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} |
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189 | 0 |
public RequestListener getRequestListener() {
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return requestListener;
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} |
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} |
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