org.directwebremoting.impl.PollingServerLoadMonitor Maven / Gradle / Ivy

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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed 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.directwebremoting.impl;

import java.util.Random;

import org.directwebremoting.extend.ServerLoadMonitor;

/**
 * A default implementation of ServerLoadMonitor
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class PollingServerLoadMonitor implements ServerLoadMonitor 
{
    /* (non-Javadoc)
     * @see org.directwebremoting.ServerLoadMonitor#timeWithinPoll()
     */
    public long getPreStreamWaitTime()
    {
        return 0;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerLoadMonitor#timeWithinPoll()
     */
    public long getPostStreamWaitTime()
    {
        return 0;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerLoadMonitor#timeToNextPoll()
     */
    public int getTimeToNextPoll()
    {
        return random.nextInt(timeToNextPoll);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerLoadMonitor#threadWaitStarting()
     */
    public void threadWaitStarting()
    {
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerLoadMonitor#threadWaitEnding()
     */
    public void threadWaitEnding()
    {
    }

    /**
     * We ask clients to wait a random number of millis before they come
     * back to avoid killing the server
     */
    protected Random random = new Random();

    /**
     * How long are we telling users to wait before they come back next
     */
    protected int timeToNextPoll = 5000;
}