Source Code Cross Referenced for Executor.java in  » Database-JDBC-Connection-Pool » proxool » org » logicalcobwebs » concurrent » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » proxool » org.logicalcobwebs.concurrent 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:          File: Executor.java
03:
04:          Originally written by Doug Lea and released into the public domain.
05:          This may be used for any purposes whatsoever without acknowledgment.
06:          Thanks for the assistance and support of Sun Microsystems Labs,
07:          and everyone contributing, testing, and using this code.
08:
09:          History:
10:          Date       Who                What
11:          19Jun1998  dl               Create public version
12:         */
13:
14:        package org.logicalcobwebs.concurrent;
15:
16:        /**
17:         * Interface for objects that execute Runnables,
18:         * as well as various objects that can be wrapped
19:         * as Runnables.
20:         * The main reason to use Executor throughout a program or
21:         * subsystem is to provide flexibility: You can easily
22:         * change from using thread-per-task to using pools or
23:         * queuing, without needing to change most of your code that
24:         * generates tasks.
25:         * <p>
26:         * The general intent is that execution be asynchronous,
27:         * or at least independent of the caller. For example,
28:         * one of the simplest implementations of <code>execute</code>
29:         * (as performed in ThreadedExecutor)
30:         * is <code>new Thread(command).start();</code>.
31:         * However, this interface allows implementations that instead
32:         * employ queueing or pooling, or perform additional
33:         * bookkeeping.
34:         * <p>
35:         *
36:         * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
37:         **/
38:        public interface Executor {
39:            /**
40:             * Execute the given command. This method is guaranteed
41:             * only to arrange for execution, that may actually
42:             * occur sometime later; for example in a new
43:             * thread. However, in fully generic use, callers
44:             * should be prepared for execution to occur in
45:             * any fashion at all, including immediate direct
46:             * execution.
47:             * <p>
48:             * The method is defined not to throw
49:             * any checked exceptions during execution of the command. Generally,
50:             * any problems encountered will be asynchronous and
51:             * so must be dealt with via callbacks or error handler
52:             * objects. If necessary, any context-dependent
53:             * catastrophic errors encountered during
54:             * actions that arrange for execution could be accompanied
55:             * by throwing context-dependent unchecked exceptions.
56:             * <p>
57:             * However, the method does throw InterruptedException:
58:             * It will fail to arrange for execution
59:             * if the current thread is currently interrupted.
60:             * Further, the general contract of the method is to avoid,
61:             * suppress, or abort execution if interruption is detected
62:             * in any controllable context surrounding execution.
63:             **/
64:            public void execute(Runnable command) throws InterruptedException;
65:
66:        }
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