org.rzo.netty.ahessian.heartbeat.IntervalTimer.java Source code

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Here is the source code for org.rzo.netty.ahessian.heartbeat.IntervalTimer.java

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/*******************************************************************************
 * Copyright  2015 rzorzorzo@users.sf.net
 *
 * 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.rzo.netty.ahessian.heartbeat;

import io.netty.util.Timeout;
import io.netty.util.Timer;
import io.netty.util.TimerTask;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;

import org.rzo.netty.ahessian.utils.MyReentrantLock;

public class IntervalTimer {
    private final Timer _timer;
    private final TimerTask _task;
    private volatile Timeout _timeout;
    private final long _interval;
    private volatile String _name = "?";
    private final Lock _lock = new MyReentrantLock();

    public IntervalTimer(final Timer timer, final TimerTask task, final long interval) {
        _timer = timer;
        _task = new TimerTask() {

            public void run(Timeout timeout) throws Exception {
                _lock.lock();
                try {
                    if (!timeout.equals(getTimeout())) {
                        // System.out.println("other timeout -> ignore");
                        return;
                    }
                    // System.out.println(new Date()+" timer called " +
                    // _name+"/"+_interval);
                    try {
                        task.run(timeout);
                    } catch (Throwable ex) {
                        ex.printStackTrace();
                    }
                    if (getTimeout() != null)
                        setTimeout(_timer.newTimeout(this, interval, TimeUnit.MILLISECONDS));
                } finally {
                    _lock.unlock();
                }

            }

        };
        _interval = interval;
    }

    synchronized public void start() {
        _lock.lock();
        try {
            if (_timeout != null)
                return;
            // System.out.println("starting timer "+_name);
            setTimeout(_timer.newTimeout(_task, _interval, TimeUnit.MILLISECONDS));
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            _lock.unlock();
        }
    }

    synchronized public void stop() {
        _lock.lock();
        try {
            if (getTimeout() == null)
                return;
            // System.out.println("stopping timer "+_name);
            getTimeout().cancel();
            setTimeout(null);
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            _lock.unlock();
        }
    }

    synchronized public boolean isActive() {
        return _timeout != null;
    }

    public long getInterval() {
        return _interval;
    }

    public void setName(String name) {
        _name = name;
    }

    private Timeout getTimeout() {
        return _timeout;
    }

    private void setTimeout(Timeout timeout) {
        _timeout = timeout;
    }

}