Source Code Cross Referenced for Slot.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: Slot.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:          25aug1998  dl               added peek
13:         */
14:
15:        package EDU.oswego.cs.dl.util.concurrent;
16:
17:        import java.lang.reflect.*;
18:
19:        /**
20:         * A one-slot buffer, using semaphores to control access.
21:         * Slots are usually more efficient and controllable than using other
22:         * bounded buffers implementations with capacity of 1.
23:         * <p>
24:         * Among other applications, Slots can be convenient in token-passing
25:         * designs: Here. the Slot holds a some object serving as a token,
26:         * that can be obtained
27:         * and returned by various threads.
28:         *
29:         * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
30:         **/
31:
32:        public class Slot extends SemaphoreControlledChannel {
33:
34:            /**
35:             * Create a buffer with the given capacity, using
36:             * the supplied Semaphore class for semaphores.
37:             * @exception NoSuchMethodException If class does not have constructor 
38:             * that intializes permits
39:             * @exception SecurityException if constructor information 
40:             * not accessible
41:             * @exception InstantiationException if semaphore class is abstract
42:             * @exception IllegalAccessException if constructor cannot be called
43:             * @exception InvocationTargetException if semaphore constructor throws an
44:             * exception
45:             **/
46:
47:            public Slot(Class semaphoreClass) throws NoSuchMethodException,
48:                    SecurityException, InstantiationException,
49:                    IllegalAccessException, InvocationTargetException {
50:                super (1, semaphoreClass);
51:            }
52:
53:            /** 
54:             * Create a new Slot using default Semaphore implementations 
55:             **/
56:            public Slot() {
57:                super (1);
58:            }
59:
60:            /** The slot **/
61:            protected Object item_ = null;
62:
63:            /** Set the item in preparation for a take **/
64:            protected synchronized void insert(Object x) {
65:                item_ = x;
66:            }
67:
68:            /** Take item known to exist **/
69:            protected synchronized Object extract() {
70:                Object x = item_;
71:                item_ = null;
72:                return x;
73:            }
74:
75:            public synchronized Object peek() {
76:                return item_;
77:            }
78:
79:        }
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