Source Code Cross Referenced for ReadWriteLock.java in  » Ajax » Laszlo-4.0.10 » EDU » oswego » cs » dl » util » concurrent » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » Laszlo 4.0.10 » EDU.oswego.cs.dl.util.concurrent 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:          File: ReadWriteLock.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:          11Jun1998  dl               Create public version
12:         */
13:
14:        package EDU.oswego.cs.dl.util.concurrent;
15:
16:        /**
17:         *  ReadWriteLocks maintain a pair of associated locks.
18:         * The readLock may be held simultanously by multiple
19:         * reader threads, so long as there are no writers. The writeLock
20:         * is exclusive. ReadWrite locks are generally preferable to
21:         * plain Sync locks or synchronized methods in cases where:
22:         * <ul>
23:         *   <li> The methods in a class can be cleanly separated into
24:         *        those that only access (read) data vs those that 
25:         *        modify (write).
26:         *   <li> Target applications generally have more readers than writers.
27:         *   <li> The methods are relatively time-consuming (as a rough
28:         *        rule of thumb, exceed more than a hundred instructions), so it
29:         *        pays to introduce a bit more overhead associated with
30:         *        ReadWrite locks compared to simple synchronized methods etc
31:         *        in order to allow concurrency among reader threads.
32:         *        
33:         * </ul>
34:         * Different implementation classes differ in policies surrounding
35:         * which threads to prefer when there is
36:         * contention. By far, the most commonly useful policy is 
37:         * WriterPreferenceReadWriteLock. The other implementations
38:         * are targeted for less common, niche applications.
39:         *<p>
40:         * Standard usage:
41:         * <pre>
42:         * class X {
43:         *   ReadWriteLock rw;
44:         *   // ...
45:         *
46:         *   public void read() throws InterruptedException { 
47:         *     rw.readLock().acquire();
48:         *     try {
49:         *       // ... do the read
50:         *     }
51:         *     finally {
52:         *       rw.readlock().release()
53:         *     }
54:         *   }
55:         *
56:         *
57:         *   public void write() throws InterruptedException { 
58:         *     rw.writeLock().acquire();
59:         *     try {
60:         *       // ... do the write
61:         *     }
62:         *     finally {
63:         *       rw.writelock().release()
64:         *     }
65:         *   }
66:         * }
67:         * </pre>
68:         * @see Sync
69:         * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
70:
71:         **/
72:
73:        public interface ReadWriteLock {
74:            /** get the readLock **/
75:            Sync readLock();
76:
77:            /** get the writeLock **/
78:            Sync writeLock();
79:        }
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