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.newStack;
18:
19: import java.util.List;
20:
21: import org.apache.tapestry.ioc.internal.util.CollectionFactory;
22: import org.apache.tapestry.ioc.internal.util.Defense;
23: import org.apache.tapestry.ioc.util.Stack;
24: import org.apache.tapestry.services.Heartbeat;
25:
26: public class HeartbeatImpl implements Heartbeat {
27: private final Stack<List<Runnable>> _stack = newStack();
28:
29: public void begin() {
30: List<Runnable> beat = CollectionFactory.newList();
31:
32: _stack.push(beat);
33: }
34:
35: public void defer(Runnable command) {
36: Defense.notNull(command, "command");
37:
38: _stack.peek().add(command);
39:
40: }
41:
42: public void end() {
43: List<Runnable> beat = _stack.pop();
44:
45: for (Runnable r : beat)
46: r.run();
47: }
48:
49: }
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