1 //========================================================================
2 //$Id: ThreadPool.java,v 1.4 2005/11/20 11:30:38 gregwilkins Exp $
3 //Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
4 //------------------------------------------------------------------------
5 //Licensed under the Apache License, Version 2.0 (the "License");
6 //you may not use this file except in compliance with the License.
7 //You may obtain a copy of the License at
8 //http://www.apache.org/licenses/LICENSE-2.0
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
16 package org.mortbay.thread;
17
18 import org.mortbay.component.LifeCycle;
19
20 /* ------------------------------------------------------------ */
21 /** ThreadPool.
22 * @author gregw
23 *
24 */
25 public interface ThreadPool
26 {
27 /* ------------------------------------------------------------ */
28 public abstract boolean dispatch(Runnable job);
29
30 /* ------------------------------------------------------------ */
31 /**
32 * Blocks until the thread pool is {@link LifeCycle#stop stopped}.
33 */
34 public void join() throws InterruptedException;
35
36 /* ------------------------------------------------------------ */
37 /**
38 * @return The total number of threads currently in the pool
39 */
40 public int getThreads();
41
42 /* ------------------------------------------------------------ */
43 /**
44 * @return The number of idle threads in the pool
45 */
46 public int getIdleThreads();
47
48 /* ------------------------------------------------------------ */
49 /**
50 * @return True if the pool is low on threads
51 */
52 public boolean isLowOnThreads();
53 }