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ThreadEventNotifier.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.service; | |
16 | ||
17 | /** | |
18 | * Service which acts as a dispatch hub for events about the lifecycle of the current thread. | |
19 | * <p> | |
20 | * Note: prior to release 1.1.1, the ThreadEventNotifier implementation would retain the listeners | |
21 | * after {@link #fireThreadCleanup()}, which could allow certain threads to retain a reference to a | |
22 | * listener, and thus that listener's class loader, even after the an application redeployment, | |
23 | * resulting in a massive memory leak. Starting with release 1.1.1, all listeners are discarded by | |
24 | * {@link #fireThreadCleanup()}. | |
25 | * | |
26 | * @author Howard Lewis Ship | |
27 | */ | |
28 | public interface ThreadEventNotifier | |
29 | { | |
30 | /** | |
31 | * Adds the listener. The notifier retains the listener until {@link #fireThreadCleanup()} is | |
32 | * invoked, at which point is discarded. | |
33 | */ | |
34 | public void addThreadCleanupListener(ThreadCleanupListener listener); | |
35 | ||
36 | /** | |
37 | * Removes the listener, if it has been previously added. If the listener has been added | |
38 | * multiple times, only one instance is removed. Note that this method is rarely used, because | |
39 | * all listeners are automatically removed by {@link #fireThreadCleanup()}. | |
40 | */ | |
41 | public void removeThreadCleanupListener(ThreadCleanupListener listener); | |
42 | ||
43 | /** | |
44 | * Invokes {@link ThreadCleanupListener#threadDidCleanup()} on all listeners, and discards the | |
45 | * list of listeners. | |
46 | */ | |
47 | public void fireThreadCleanup(); | |
48 | } |
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