Source Code Cross Referenced for Queue.java in  » Testing » Marathon » com » ziclix » python » sql » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » Marathon » com.ziclix.python.sql.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Jython Database Specification API 2.0
003:         *
004:         * $Id: Queue.java 2414 2005-02-23 04:26:23Z bzimmer $
005:         *
006:         * Copyright (c) 2001 brian zimmer <bzimmer@ziclix.com>
007:         *
008:         */
009:        package com.ziclix.python.sql.util;
010:
011:        import java.util.LinkedList;
012:
013:        /**
014:         * This queue blocks until closed or an element is enqueued.  If the queue
015:         * reaches capacity, the dequeue thread gets priority in order to bring the
016:         * queue size under a certain threshold.
017:         *
018:         * @author brian zimmer
019:         * @version $Revision: 2414 $
020:         */
021:        public class Queue {
022:
023:            /**
024:             * Field closed
025:             */
026:            protected boolean closed;
027:
028:            /**
029:             * Field queue
030:             */
031:            protected LinkedList queue;
032:
033:            /**
034:             * Field capacity, threshold
035:             */
036:            protected int capacity, threshold;
037:
038:            /**
039:             * Instantiate a blocking queue with no bounded capacity.
040:             */
041:            public Queue() {
042:                this (0);
043:            }
044:
045:            /**
046:             * Instantiate a blocking queue with the specified capacity.
047:             */
048:            public Queue(int capacity) {
049:
050:                this .closed = false;
051:                this .capacity = capacity;
052:                this .queue = new LinkedList();
053:                this .threshold = (int) (this .capacity * 0.75f);
054:            }
055:
056:            /**
057:             * Enqueue an object and notify all waiting Threads.
058:             */
059:            public synchronized void enqueue(Object element)
060:                    throws InterruptedException {
061:
062:                if (closed) {
063:                    throw new QueueClosedException();
064:                }
065:
066:                this .queue.addLast(element);
067:                this .notify();
068:
069:                /*
070:                 * Block while the capacity of the queue has been breached.
071:                 */
072:                while ((this .capacity > 0)
073:                        && (this .queue.size() >= this .capacity)) {
074:                    this .wait();
075:
076:                    if (closed) {
077:                        throw new QueueClosedException();
078:                    }
079:                }
080:            }
081:
082:            /**
083:             * Blocks until an object is dequeued or the queue is closed.
084:             */
085:            public synchronized Object dequeue() throws InterruptedException {
086:
087:                while (this .queue.size() <= 0) {
088:                    this .wait();
089:
090:                    if (closed) {
091:                        throw new QueueClosedException();
092:                    }
093:                }
094:
095:                Object object = this .queue.removeFirst();
096:
097:                // if space exists, notify the other threads
098:                if (this .queue.size() < this .threshold) {
099:                    this .notify();
100:                }
101:
102:                return object;
103:            }
104:
105:            /**
106:             * Close the queue and notify all waiting Threads.
107:             */
108:            public synchronized void close() {
109:
110:                this .closed = true;
111:
112:                this.notifyAll();
113:            }
114:        }
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