ThreadPoolRunnable


1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one or more
3    *  contributor license agreements.  See the NOTICE file distributed with
4    *  this work for additional information regarding copyright ownership.
5    *  The ASF licenses this file to You under the Apache License, Version 2.0
6    *  (the "License"); you may not use this file except in compliance with
7    *  the License.  You may obtain a copy of the License at
8    *
9    *      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  
18  package org.apache.tomcat.util.threads;
19  
20  
21  /** Implemented if you want to run a piece of code inside a thread pool.
22   */
23  public interface ThreadPoolRunnable {
24      // XXX use notes or a hashtable-like
25      // Important: ThreadData in JDK1.2 is implemented as a Hashtable( Thread -> object ),
26      // expensive.
27      
28      /** Called when this object is first loaded in the thread pool.
29       *  Important: all workers in a pool must be of the same type,
30       *  otherwise the mechanism becomes more complex.
31       */
32      public Object  [] getInitData();
33  
34      /** This method will be executed in one of the pool's threads. The
35       *  thread will be returned to the pool.
36       */
37      public void runIt(Object   thData[]);
38  
39  }
40

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