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Java > Open Source Codes > org > mr > api > blocks > ScalableFactory


1 /*
2  * Copyright 2002 by
3  * <a HREF="http://www.coridan.com">Coridan</a>
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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/
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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
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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.
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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
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29  * License and not to allow others to use your version of this file under
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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.
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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
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45  */
46 package org.mr.api.blocks;
47
48 import java.util.HashMap JavaDoc;
49
50
51
52 /**
53  * This factory dynamically creates the proper instance of stages and dispatcher
54  * or if the instance has already been created in the past returns a reference to it
55  * @author Amir Shevat
56  *
57  */
58 public class ScalableFactory {
59     /**
60      * holds a reference to previously created stages
61      */
62     private static HashMap JavaDoc stages = new HashMap JavaDoc();
63     /**
64      * holds a reference to previously created dispathcers
65      */
66     private static HashMap JavaDoc dispathcers = new HashMap JavaDoc();
67     
68     /**
69      * the factory method for ScalableStage reference to the stage and new instance should be obtain from this method
70      * @param stageName the name of the stage, this serves as a key for the stage and a name for the underlying queue
71      * @param distributed if true the stage will support distributed operations (JMS), only applicable for new stage
72      * @return a reference to a new or preciously created stage
73      */
74     public final static synchronized ScalableStage getStage(String JavaDoc stageName ,boolean distributed){
75         ScalableStage result = (ScalableStage) stages.get(stageName);
76         if(result == null){
77             result = new ScalableStage(stageName,distributed);
78             stages.put(stageName,result );
79         }
80         return result;
81         
82     }
83     
84     /**
85      * the factory method for ScalableDispatcher reference to the dispacher and new instance should be obtain from this method
86      * @param name the name of the dispacher, this serves as a key for the dispacher and a name for the underlying topic
87      * @param distributed if true the dispacher will support distributed operations (JMS), only applicable for new stage
88      * @return a reference to a new or preciously created dispacher
89      */
90     public final static synchronized ScalableDispatcher getDispatcher(String JavaDoc name ,boolean distributed){
91         ScalableDispatcher result = (ScalableDispatcher) dispathcers.get(name);
92         if(result == null){
93             result = new ScalableDispatcher(name,distributed);
94             dispathcers.put(name,result );
95         }
96         return result;
97         
98     }
99 }
100
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