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Java > Open Source Codes > org > apache > hivemind > impl > servicemodel > PrimitiveServiceModel


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.hivemind.impl.servicemodel;
16
17 import org.apache.hivemind.impl.ConstructableServicePoint;
18
19 /**
20  * Implementation of {@link org.apache.hivemind.internal.ServiceModel} for the primitive services
21  * (that do not include the standard deferred instantiation proxy).
22  *
23  * @author Howard Lewis Ship
24  */
25 public final class PrimitiveServiceModel extends AbstractServiceModelImpl
26 {
27     private Object JavaDoc _constructedService;
28
29     public PrimitiveServiceModel(ConstructableServicePoint servicePoint)
30     {
31         super(servicePoint);
32     }
33
34     /**
35      * Constructs the service (the first time this is invoked) and returns it.
36      */
37     public synchronized Object JavaDoc getService()
38     {
39         if (_constructedService == null)
40         {
41             _constructedService = constructServiceImplementation();
42
43             registerWithShutdownCoordinator(_constructedService);
44         }
45
46         // Note: if the service's declared interface is a class AND
47 // the service has interceptors, then it will not be possible
48 // to cast the result (since the returned interceptor will implement
49 // the synthetic service interface).
50
51         return _constructedService;
52     }
53
54     /**
55      * Invokes {@link #getService()} to ensure that the core service implementation has been
56      * instantiated.
57      */
58     public void instantiateService()
59     {
60         getService();
61     }
62
63 }
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