01: //========================================================================
02: //$Id: ThreadPool.java,v 1.4 2005/11/20 11:30:38 gregwilkins Exp $
03: //Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
04: //------------------------------------------------------------------------
05: //Licensed under the Apache License, Version 2.0 (the "License");
06: //you may not use this file except in compliance with the License.
07: //You may obtain a copy of the License at
08: //http://www.apache.org/licenses/LICENSE-2.0
09: //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: public abstract boolean dispatch(Runnable job);
28:
29: /* ------------------------------------------------------------ */
30: /**
31: * Blocks until the thread pool is {@link LifeCycle#stop stopped}.
32: */
33: public void join() throws InterruptedException;
34:
35: /* ------------------------------------------------------------ */
36: /**
37: * @return The total number of threads currently in the pool
38: */
39: public int getThreads();
40:
41: /* ------------------------------------------------------------ */
42: /**
43: * @return The number of idle threads in the pool
44: */
45: public int getIdleThreads();
46:
47: /* ------------------------------------------------------------ */
48: /**
49: * @return True if the pool is low on threads
50: */
51: public boolean isLowOnThreads();
52: }
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