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package com.redhat.lightblue.migrator;

/**
 * Base class for all monitored threads. Once created, this thread needs to be
 * registered with a ThreadMonitor. The implementing thread should call ping
 * periodically to notify progress. If ping is not called for a long time, the
 * thread monitor will try to interrup and terminate the thread. A terminated
 * thread will throw a runtime exception next time it calls ping.
 */
public abstract class AbstractMonitoredThread extends Thread implements MonitoredThread {

    private ThreadMonitor monitor;

    public AbstractMonitoredThread() {
    }

    public AbstractMonitoredThread(String name) {
        super(name);
    }

    public AbstractMonitoredThread(ThreadGroup group, String name) {
        super(group, name);
    }

    @Override
    public void registerThreadMonitor(ThreadMonitor monitor) {
        this.monitor = monitor;
        ping();
    }

    public void ping() {
        ping(null);
    }

    @Override
    public void ping(String msg) {
        if (monitor != null) {
            monitor.ping(msg);
        }
    }

    @Override
    public void notifyEnd() {
        if (monitor != null) {
            monitor.endThread();
        }
    }

    @Override
    public final void run() {
        try {
            monitoredRun();
        } finally {
            notifyEnd();
        }
    }

    protected abstract void monitoredRun();
}