com.zendesk.maxwell.util.RunLoopProcess Maven / Gradle / Ivy

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Maxwell's daemon. Watches mysql, outputs to JSON.

There is a newer version: 1.8.0

package com.zendesk.maxwell.util;

import java.util.concurrent.TimeoutException;

abstract public class RunLoopProcess implements StoppableTask {
	protected volatile StoppableTaskState taskState;
	private Thread thread;

	public RunLoopProcess() {
		this.taskState = new StoppableTaskState(this.getClass().getName());
	}

	public void requestStop() {
		this.taskState.requestStop();

		interrupt();
	}

	public void interrupt() {
		if ( this.thread != null )
			this.thread.interrupt();
	}

	public void awaitStop(Long timeout) throws TimeoutException {
		this.taskState.awaitStop(thread, timeout);
	}

	public void runLoop() throws Exception {
		this.thread = Thread.currentThread();
		this.beforeStart();

		try {
			while (this.taskState.isRunning()) {
				work();
			}
		} finally {
			this.beforeStop();
			this.taskState.stopped();
		}
	}

	protected abstract void work() throws Exception;
	protected void beforeStart() throws Exception { }
	protected void beforeStop() throws Exception { }
}