ActiveIO - 1.0

Clover coverage report - ActiveIO - 1.0

Coverage timestamp: Fri Apr 22 2005 14:27:22 PDT

FRAMES NO FRAMES

file stats:	LOC:	193		Methods:	12
	NCLOC:	128		Classes:	1

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Methods

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AsynchChannelToConcurrentRequestChannel.java

 /**
  *
  * Copyright 2004 Hiram Chirino
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  */
 package org.activeio.adapter;
 
 import java.io.IOException;
 import java.io.InterruptedIOException;
 
 import org.activeio.AsynchChannel;
 import org.activeio.ChannelFactory;
 import org.activeio.FilterAsynchChannel;
 import org.activeio.Packet;
 import org.activeio.PacketData;
 import org.activeio.RequestChannel;
 import org.activeio.RequestListener;
 import org.activeio.packet.AppendedPacket;
 import org.activeio.packet.ByteArrayPacket;
 
 import EDU.oswego.cs.dl.util.concurrent.ConcurrentHashMap;
 import EDU.oswego.cs.dl.util.concurrent.Executor;
 import EDU.oswego.cs.dl.util.concurrent.Slot;
 
 
 /**
  * Creates a {@see org.activeio.RequestChannel} out of a {@see org.activeio.AsynchChannel}.  This 
  * {@see org.activeio.RequestChannel} is thread safe and mutiplexes concurrent requests and responses over
  * the underlying {@see org.activeio.AsynchChannel}.
  * 
  * @version $Revision$
  */
 final public class AsynchChannelToConcurrentRequestChannel extends FilterAsynchChannel implements RequestChannel {
 
     private static final byte PASSTHROUGH = 0x00;
     private static final byte REQUEST = 0x01;
     private static final byte RESPONSE = 0x02;    
     private static final ByteArrayPacket PASSTHROUGH_PACKET = new ByteArrayPacket(new byte[]{PASSTHROUGH});
     
     private final ConcurrentHashMap requestMap = new ConcurrentHashMap();
     private final Executor requestExecutor;
     private short nextRequestId = 0;
     private final Object writeMutex = new Object();
     
     private RequestListener requestListener;
     
     public AsynchChannelToConcurrentRequestChannel(AsynchChannel next) {
         this(next, ChannelFactory.DEFAULT_EXECUTOR);
     }
 
     public AsynchChannelToConcurrentRequestChannel(AsynchChannel next, Executor requestExecutor) {
         super(next);
         this.requestExecutor=requestExecutor;
     }
     
     synchronized short getNextRequestId() {
         return nextRequestId++;
     }
 
     /**
      * @see org.activeio.FilterAsynchChannel#write(org.activeio.channel.Packet)
      */
     public void write(Packet packet) throws IOException {
         Packet passThrough = AppendedPacket.join(PASSTHROUGH_PACKET.duplicate(), packet);
         synchronized(writeMutex) {
             super.write(passThrough);
         }
     }
 
     /**
      * @see org.activeio.FilterAsynchChannel#onPacket(org.activeio.channel.Packet)
      */
     public void onPacket(final Packet packet) {
             switch( packet.read() ) {
                 case PASSTHROUGH:
                     super.onPacket(packet);
                     break;
                 case REQUEST:
                     try {
                         requestExecutor.execute(new Runnable(){
                             public void run() {
                                 serviceRequest(packet);
                             }
                         });
                     } catch (InterruptedException e) {
                         Thread.currentThread().interrupt();
                     }
                     break;
                 case RESPONSE:
                     serviceReponse(packet);
                     break;
             }
     }
 
     private void serviceRequest(Packet packet) {
         try {
             if( requestListener ==null )
                 throw new IOException("The RequestListener has not been set.");
 
             PacketData data = new PacketData(packet);
             short requestId = data.readShort();            
             Packet reponse = requestListener.onRequest(packet);
 
             // Send the response...
             Packet header = createHeaderPacket(RESPONSE, requestId);        
             Packet rc = AppendedPacket.join(header, packet);        
             synchronized(writeMutex) {
                 super.write(rc);
             }
         } catch (IOException e) {
             super.onPacketError(e);
         }
         
     }
 
     private void serviceReponse(Packet packet) {
         
         try {
             
             PacketData data = new PacketData(packet);
             short requestId = data.readShort();
             
             Slot responseSlot = (Slot) requestMap.get(new Short(requestId));
             responseSlot.put(packet);
             
         } catch (IOException e) {
             super.onPacketError(e);
         } catch (InterruptedException e) {
             Thread.currentThread().interrupt();
         }
         
         
     }
 
     public Packet request(Packet request, long timeout) throws IOException {
         
         Short requestId = new Short(getNextRequestId());
         Slot responseSlot = new Slot();
         requestMap.put(requestId, responseSlot);
         
         Packet header = createHeaderPacket(REQUEST, requestId.shortValue());        
         Packet packet = AppendedPacket.join(header, request);
         
         synchronized(writeMutex) {
             super.write(packet);
         }
         
         try {
             
             if( timeout == WAIT_FOREVER_TIMEOUT ) {
                 return (Packet) responseSlot.take();                
             } else if (timeout == NO_WAIT_TIMEOUT ) {
                 return (Packet) responseSlot.poll(1);                                
             } else {
                 return (Packet) responseSlot.poll(timeout);                                
             }
             
         } catch (InterruptedException e) {
             throw new InterruptedIOException(e.getMessage());
         } finally {
             requestMap.remove(requestId);
         }        
     }
 
     private Packet createHeaderPacket(byte type, short requestId) throws IOException {
         ByteArrayPacket header = new ByteArrayPacket(new byte[]{3});
         PacketData data = new PacketData(header);
         data.writeByte(type);
         data.writeShort(requestId);
         header.flip();
         return header;
     }
 
     public void setRequestListener(RequestListener requestListener) throws IOException {
         this.requestListener = requestListener;        
     }
 
     public RequestListener getRequestListener() {
         return requestListener;
     }
 }
 

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