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ServiceModel.java | - | - | - | - |
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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.internal; | |
16 | ||
17 | /** | |
18 | * A service model is associated with a {@link org.apache.hivemind.internal.ServicePoint} to supply | |
19 | * rules for the lifecycle of the service. This concerns when the service is first created and | |
20 | * whether it is pooled, etc. Each service extension point will have a unique instance of | |
21 | * ServiceModel. | |
22 | * | |
23 | * @author Howard Lewis Ship | |
24 | */ | |
25 | public interface ServiceModel | |
26 | { | |
27 | /** | |
28 | * Invoked by the service extension point to obtain the service implementation. The model may | |
29 | * return the actual service implementation or some form of proxy. | |
30 | * <p> | |
31 | * This method is only invoked <em>once</em>; the returned value is used from that point on | |
32 | * (in all threads, by all callers). Most models return a proxy that takes care of realizing the | |
33 | * service (actually creating the service, configuring it, and wrapping it with interceptors) | |
34 | * only when needed. | |
35 | */ | |
36 | ||
37 | public Object getService(); | |
38 | ||
39 | /** | |
40 | * Forces the core service implementation (and any interceptors) to be fully instantiated | |
41 | * immediately, rather than waiting for the first service method invocation. This is used when a | |
42 | * service needs to be "eagerly loaded" rather than "lazy loaded". | |
43 | */ | |
44 | public void instantiateService(); | |
45 | } |
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