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 /* ------------------------------------------------------------ */
19 /** ThreadPool.
20 * @author gregw
21 *
22 */
23 public interface ThreadPool
24 {
25 /* ------------------------------------------------------------ */
26 public abstract boolean dispatch(Runnable job);
27
28 /* ------------------------------------------------------------ */
29 /**
30 * Blocks until the thread pool is {@link org.mortbay.component.LifeCycle#stop stopped}.
31 */
32 public void join() throws InterruptedException;
33
34 /* ------------------------------------------------------------ */
35 /**
36 * @return The total number of threads currently in the pool
37 */
38 public int getThreads();
39
40 /* ------------------------------------------------------------ */
41 /**
42 * @return The number of idle threads in the pool
43 */
44 public int getIdleThreads();
45
46 /* ------------------------------------------------------------ */
47 /**
48 * @return True if the pool is low on threads
49 */
50 public boolean isLowOnThreads();
51 }