01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.transformation.helpers;
18:
19: import java.util.Map;
20:
21: import org.apache.avalon.framework.parameters.Parameters;
22: import org.apache.avalon.framework.thread.ThreadSafe;
23: import org.apache.cocoon.acting.ServiceableAction;
24: import org.apache.cocoon.environment.Redirector;
25: import org.apache.cocoon.environment.SourceResolver;
26:
27: /**
28: * This action starts the preemptive loader and runs forever.
29: *
30: * @author <a href="mailto:cziegeler@apache.org">Carsten Ziegeler</a>
31: * @version CVS $Id: PreemptiveLoaderAction.java 433543 2006-08-22 06:22:54Z crossley $
32: * @since 2.1
33: */
34: public class PreemptiveLoaderAction extends ServiceableAction implements
35: ThreadSafe {
36:
37: /**
38: * This action starts the preemptive loading
39: * It runs forever and is stopped by the {@link DefaultIncludeCacheManager}.
40: * @see org.apache.cocoon.acting.Action#act(Redirector, SourceResolver, Map, String, Parameters)
41: */
42: public Map act(Redirector redirector, SourceResolver resolver,
43: Map objectModel, String source, Parameters parameters)
44: throws Exception {
45: PreemptiveLoader loader = PreemptiveLoader.getInstance();
46: if (!loader.alive) {
47: loader.process(this.manager, resolver, this.getLogger());
48: return EMPTY_MAP;
49: }
50: return null;
51: }
52: }
|