1 // ========================================================================
2 // Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
3 // ------------------------------------------------------------------------
4 // All rights reserved. This program and the accompanying materials
5 // are made available under the terms of the Eclipse Public License v1.0
6 // and Apache License v2.0 which accompanies this distribution.
7 // The Eclipse Public License is available at
8 // http://www.eclipse.org/legal/epl-v10.html
9 // The Apache License v2.0 is available at
10 // http://www.opensource.org/licenses/apache2.0.php
11 // You may elect to redistribute this code under either of these licenses.
12 // ========================================================================
13
14 package org.eclipse.jetty.util.thread;
15
16 import org.eclipse.jetty.util.component.LifeCycle;
17
18 /* ------------------------------------------------------------ */
19 /** ThreadPool.
20 *
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 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
52
53 /* ------------------------------------------------------------ */
54 /* ------------------------------------------------------------ */
55 public interface SizedThreadPool extends ThreadPool
56 {
57 public int getMinThreads();
58 public int getMaxThreads();
59 public void setMinThreads(int threads);
60 public void setMaxThreads(int threads);
61 }
62 }