01: // Copyright 2006, 2007 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // 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.internal.services;
16:
17: import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newCaseInsensitiveMap;
18:
19: import java.util.Map;
20:
21: import org.apache.tapestry.internal.structure.Page;
22: import org.apache.tapestry.ioc.services.ThreadCleanupListener;
23:
24: public class RequestPageCacheImpl implements RequestPageCache,
25: ThreadCleanupListener {
26: private final PagePool _pagePool;
27:
28: /**
29: * Keyed on logical page name (case insensitive).
30: */
31: private final Map<String, Page> _cache = newCaseInsensitiveMap();
32:
33: public RequestPageCacheImpl(PagePool pagePool) {
34: _pagePool = pagePool;
35: }
36:
37: public Page get(String logicalPageName) {
38: Page page = _cache.get(logicalPageName);
39:
40: if (page == null) {
41: page = _pagePool.checkout(logicalPageName);
42:
43: page.attached();
44:
45: _cache.put(logicalPageName, page);
46: }
47:
48: return page;
49: }
50:
51: /**
52: * At the end of the request, when the thread cleanup event occurs, release any pages attached
53: * to the request back to the page pool.
54: */
55: public void threadDidCleanup() {
56: for (Page p : _cache.values())
57: _pagePool.release(p);
58: }
59: }
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