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Tomcat example source code file (Queue.java)

This example Tomcat source code file (Queue.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

interruptedexception, interruptedexception, object, object, queue, queue, util, vector, vector

The Tomcat Queue.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.catalina.util;

import java.util.Vector;

/**
 * A simple FIFO queue class which causes the calling thread to wait
 * if the queue is empty and notifies threads that are waiting when it
 * is not empty.
 *
 * @author Anil V (akv@eng.sun.com)
 */
public class Queue {
    private Vector vector = new Vector();

    /**
     * Put the object into the queue.
     *
     * @param   object          the object to be appended to the
     *                          queue.
     */
    public synchronized void put(Object object) {
        vector.addElement(object);
        notify();
    }

    /**
     * Pull the first object out of the queue. Wait if the queue is
     * empty.
     */
    public synchronized Object pull() {
        while (isEmpty())
            try {
                wait();
            } catch (InterruptedException ex) {
            }
        return get();
    }

    /**
     * Get the first object out of the queue. Return null if the queue
     * is empty.
     */
    public synchronized Object get() {
        Object object = peek();
        if (object != null)
            vector.removeElementAt(0);
        return object;
    }

    /**
     * Peek to see if something is available.
     */
    public Object peek() {
        if (isEmpty())
            return null;
        return vector.elementAt(0);
    }

    /**
     * Is the queue empty?
     */
    public boolean isEmpty() {
        return vector.isEmpty();
    }

    /**
     * How many elements are there in this queue?
     */
    public int size() {
        return vector.size();
    }
}

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat Queue.java source code file:



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