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Java > Open Source Codes > org > mr > kernel > services > queues > QueueMaster


1 /*
2  * Copyright 2002 by
3  * <a HREF="http://www.coridan.com">Coridan</a>
4  * <a HREF="mailto: support@coridan.com ">support@coridan.com</a>
5  *
6  * The contents of this file are subject to the Mozilla Public License Version
7  * 1.1 (the "License"); you may not use this file except in compliance with the
8  * License. You may obtain a copy of the License at
9  * http://www.mozilla.org/MPL/
10  *
11  * Software distributed under the License is distributed on an "AS IS" basis,
12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13  * for the specific language governing rights and limitations under the
14  * License.
15  *
16  * The Original Code is "MantaRay" (TM).
17  *
18  * The Initial Developer of the Original Code is Amir Shevat.
19  * Portions created by the Initial Developer are Copyright (C) 2006
20  * Coridan Inc. All Rights Reserved.
21  *
22  * Contributor(s): all the names of the contributors are added in the source
23  * code where applicable.
24  *
25  * Alternatively, the contents of this file may be used under the terms of the
26  * LGPL license (the "GNU LESSER GENERAL PUBLIC LICENSE"), in which case the
27  * provisions of LGPL are applicable instead of those above. If you wish to
28  * allow use of your version of this file only under the terms of the LGPL
29  * License and not to allow others to use your version of this file under
30  * the MPL, indicate your decision by deleting the provisions above and
31  * replace them with the notice and other provisions required by the LGPL.
32  * If you do not delete the provisions above, a recipient may use your version
33  * of this file under either the MPL or the GNU LESSER GENERAL PUBLIC LICENSE.
34  
35  *
36  * This library is free software; you can redistribute it and/or modify it
37  * under the terms of the MPL as stated above or under the terms of the GNU
38  * Lesser General Public License as published by the Free Software Foundation;
39  * either version 2.1 of the License, or any later version.
40  *
41  * This library is distributed in the hope that it will be useful, but WITHOUT
42  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
43  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
44  * License for more details.
45  */
46 /*
47  * Created on 13/06/2004
48  *
49  * Manta LTD
50  */
51 package org.mr.kernel.services.queues;
52
53 import java.io.IOException JavaDoc;
54
55 import org.mr.MantaAgent;
56 import org.mr.MantaAgentConstants;
57 import org.mr.core.protocol.RecipientAddress;
58 import org.mr.core.util.byteable.Byteable;
59 import org.mr.core.util.byteable.ByteableInputStream;
60 import org.mr.core.util.byteable.ByteableOutputStream;
61 import org.mr.core.util.byteable.ByteableRegistry;
62 import org.mr.kernel.services.MantaService;
63 import org.mr.kernel.services.ServiceActor;
64
65 /**
66  * QueueMaster is a ServiceActor that coordinates the queue
67  * it gets messages from queue producers and requests from consumers, and manages the queue
68  *
69  * @author Amir Shevat
70  *
71  *
72  */
73 public class QueueMaster extends ServiceActor implements RecipientAddress{
74     private long validUntil;
75     
76     /**
77      * @param agentName needed for ServiceActor
78      * @param serviceName needed for ServiceActor
79      */
80     public QueueMaster(String JavaDoc agentName, String JavaDoc serviceName) {
81         super(agentName, MantaAgent.getInstance().getDomainName(), serviceName, MantaService.SERVICE_TYPE_QUEUE);
82     }
83
84     public QueueMaster(String JavaDoc agentName, String JavaDoc domainName, String JavaDoc serviceName) {
85         super(agentName, domainName, serviceName, MantaService.SERVICE_TYPE_QUEUE);
86     }
87
88     /* (non-Javadoc)
89      * @see org.mr.kernel.services.ServiceActor#getType()
90      */
91     public byte getType() {
92         return ServiceActor.COORDINATOR;
93     }
94     
95     private final static String JavaDoc byteableName = "QM";
96     
97     /* (non-Javadoc)
98      * @see org.mr.core.util.byteable.Byteable#getByteableName()
99      */
100     public String JavaDoc getByteableName() {
101         
102         return byteableName;
103     }
104     
105     
106     /* (non-Javadoc)
107      * @see org.mr.core.util.byteable.Byteable#toBytes(org.mr.core.util.byteable.ByteableOutputStream)
108      */
109     public void toBytes(ByteableOutputStream out) throws IOException JavaDoc {
110         out.writeASCIIString(getAgentName());
111         out.writeUTF(getServiceName());
112         out.writeByte(MantaService.SERVICE_TYPE_QUEUE);
113         out.writeUTF(getId());
114         
115     }
116
117     /* (non-Javadoc)
118      * @see org.mr.core.util.byteable.Byteable#createInstance(org.mr.core.util.byteable.ByteableInputStream)
119      */
120     public Byteable createInstance(ByteableInputStream in) throws IOException JavaDoc {
121         QueueMaster result = null;
122         String JavaDoc agentName = in.readASCIIString();
123         String JavaDoc serviceName = in.readUTF();
124         in.readByte();//serviceType
125 String JavaDoc id = in.readUTF();
126         result = new QueueMaster(agentName,serviceName);
127         result.id = id;
128         
129         return result;
130     }
131
132     /* (non-Javadoc)
133      * @see org.mr.core.util.byteable.Byteable#registerToByteableRegistry()
134      */
135     public void registerToByteableRegistry() {
136         ByteableRegistry.registerByteableFactory(getByteableName() , this);
137         
138     }
139     
140     public static void register(){
141         QueueMaster instance = new QueueMaster("","","");
142         instance.registerToByteableRegistry();
143     }
144     
145     public long getValidUntil() {
146         return validUntil;
147     }
148     
149     public void setValidUntil(long validUntil) {
150         this.validUntil = validUntil;
151     }
152
153     public byte getAcknowledgeMode() {
154         return MantaAgentConstants.CLIENT_ACK;
155     }
156 }
157
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