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Java > Open Source Codes > org > apache > tapestry > services > EngineManager


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.tapestry.services;
16
17 import org.apache.tapestry.IEngine;
18
19 /**
20  * Service responsible for obtaining instances of {@link org.apache.tapestry.IEngine}
21  * to service the current request. An engine service may be retrieved from a pool, or extracted
22  * from the HttpSession. After the request is processed, the engine is re-stored into the
23  * HttpSession (if stateful) or back into the pool (if not stateful).
24  *
25  * @author Howard Lewis Ship
26  * @since 4.0
27  */
28 public interface EngineManager
29 {
30     /**
31      * Locates or creates an engine instance for the current request.
32      */
33     IEngine getEngineInstance();
34     
35     /**
36      * Store the engine back at the end of the current request.
37      */
38     
39     void storeEngineInstance(IEngine engine);
40 }
41
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