A multithreaded queue used for implementing producer-consumer style threading patterns : Collections Threads « Threads « Java

Java
1. 2D Graphics GUI
2. 3D
3. Advanced Graphics
4. Ant
5. Apache Common
6. Chart
7. Class
8. Collections Data Structure
9. Data Type
10. Database SQL JDBC
11. Design Pattern
12. Development Class
13. EJB3
14. Email
15. Event
16. File Input Output
17. Game
18. Generics
19. GWT
20. Hibernate
21. I18N
22. J2EE
23. J2ME
24. JDK 6
25. JNDI LDAP
26. JPA
27. JSP
28. JSTL
29. Language Basics
30. Network Protocol
31. PDF RTF
32. Reflection
33. Regular Expressions
34. Scripting
35. Security
36. Servlets
37. Spring
38. Swing Components
39. Swing JFC
40. SWT JFace Eclipse
41. Threads
42. Tiny Application
43. Velocity
44. Web Services SOA
45. XML
Java Tutorial
Java Source Code / Java Documentation
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java » Threads » Collections ThreadsScreenshots 
A multithreaded queue used for implementing producer-consumer style threading patterns
A multithreaded queue used for implementing producer-consumer style threading patterns
  
/*
 * Funambol is a mobile platform developed by Funambol, Inc. 
 * Copyright (C) 2003 - 2007 Funambol, Inc.
 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License version 3 as published by
 * the Free Software Foundation with the addition of the following permission 
 * added to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED
 * WORK IN WHICH THE COPYRIGHT IS OWNED BY FUNAMBOL, FUNAMBOL DISCLAIMS THE 
 * WARRANTY OF NON INFRINGEMENT  OF THIRD PARTY RIGHTS.
 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 
 * You should have received a copy of the GNU Affero General Public License 
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA.
 
 * You can contact Funambol, Inc. headquarters at 643 Bair Island Road, Suite 
 * 305, Redwood City, CA 94063, USA, or at email address info@funambol.com.
 
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 
 * In accordance with Section 7(b) of the GNU Affero General Public License
 * version 3, these Appropriate Legal Notices must retain the display of the
 * "Powered by Funambol" logo. If the display of the logo is not reasonably 
 * feasible for technical reasons, the Appropriate Legal Notices must display
 * the words "Powered by Funambol".
 */


import java.util.Stack;

/**
 * A multithreaded queue used for 
 * implementing producer-consumer style threading patterns.
 * Multiple threads can wait for runnable objects being added
 * to the queue while other threads add to the queue.
 */
public class Queue {

    private Stack tasks = new Stack();
    private long defaultTimeout = 100;

    public Queue() {
    }

    /**
     * Returns the current number of runnable objects in the queue
     */
    public synchronized int size() {
        return tasks.size();
    }

    /** 
     * adds a runnable object to the end of the queue.
     * At least one thread will be notified.
     */
    public synchronized void add(Object runnable) {
        tasks.push(runnable);
        notifyAll();
    }

    /** 
     * Removes the first runnable object from the queue, blocking until one is available.
     */
    public synchronized Object remove() {
        while (true) {
            Object runnable = removeNoWait();
            if runnable != null ) {
                return runnable;
            }
            try {
                waitdefaultTimeout );
            }
            catch (InterruptedException e) {
                e.printStackTrace();
              
            }
        }
    }

    /**
     * Removes the first runnable object from the queue without blocking.
     * This method will return immediately with an item from the queue or null.
     @return the first runnable object removed from the queue or null if the
     * queue is empty
     */
    public synchronized Object removeNoWait() {
        if ! tasks.empty() ) {
            return tasks.pop();
        else {
            return null;
        }
    }

}

   
    
  
Related examples in the same category
1. Java 1.5 (5.0) new features: PriorityQueueJava 1.5 (5.0) new features: PriorityQueue
2. Safe list copySafe list copy
3. Safe vector copySafe vector copy
4. Safe collection operationSafe collection operation
5. Java 1.5 (5.0) new feature: collection and thread
6. Java Thread Performance: Collection Test
7. Java Thread Performance: AtomicTest
8. Rhyming WordsRhyming Words
9. Communicate between threads using a Queue
10. Using a Thread-Local Variable
11. A work queue is used to coordinate work between a producer and a set of worker threads.
12. Return a value from a thread.
13. Customized java.util.ArrayList: operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes.
14. Customized java.util.HashMap: operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes.
15. Customized java.util.TreeMap: operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes.
16. Current set
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.