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The free Java library for Asterisk PBX integration.

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package org.asteriskjava.pbx;

import org.asteriskjava.util.Log;
import org.asteriskjava.util.LogFactory;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

/**
 * This is a utility class designed to wait for an activity to complete. When
 * starting an activity for that you want to wait until completion pass this
 * class as the iCallback listener and then call waitForCompletion.
 * waitForCompletion will not return until the activity completes.
 *
 * @param 
 * @author bsutton
 */
public class CompletionAdaptor implements ActivityCallback {
    private static final Log logger = LogFactory.getLog(CompletionAdaptor.class);

    CountDownLatch _latch = new CountDownLatch(1);

    @Override
    public void progress(final T activity, ActivityStatusEnum status, String message) {
        if (status == ActivityStatusEnum.FAILURE || status == ActivityStatusEnum.SUCCESS) {
            _latch.countDown();
        }
    }

    public void waitForCompletion(long timeout, TimeUnit unit) {
        // wait until the activity completes
        try {
            if (!_latch.await(timeout, unit)) {
                Exception e = new Exception("Timeout waiting for activity to complete (" + timeout + " " + unit + ")");
                logger.error(e, e);
            }
        } catch (final InterruptedException e) {
            // should never happen
            CompletionAdaptor.logger.error(e, e);
        }

    }

}