package org.act.tstream.callback.impl;

import org.act.tstream.callback.BaseCallback;
import org.apache.log4j.Logger;

import org.act.tstream.cluster.StormBase;
import org.act.tstream.daemon.nimbus.NimbusData;

/**
 * Remove topology /ZK-DIR/topology data
 * 
 * remove this ZK node will trigger watch on this topology
 * 
 * And Monitor thread every 10 seconds will clean these disappear topology
 * 
 */
public class RemoveTransitionCallback extends BaseCallback {

	private static Logger LOG = Logger
			.getLogger(RemoveTransitionCallback.class);

	private NimbusData data;
	private String topologyid;

	public RemoveTransitionCallback(NimbusData data, String topologyid) {
		this.data = data;
		this.topologyid = topologyid;
	}

	@Override
	public <T> Object execute(T... args) {
		LOG.info("Begin to remove topology: " + topologyid);
		try {

			StormBase stormBase = data.getStormClusterState().storm_base(
					topologyid, null);
			if (stormBase == null) {
				LOG.info("Topology " + topologyid + " has been removed ");
				return null;
			}
			data.getStormClusterState().remove_storm(topologyid);
			LOG.info("Successfully removed ZK items topology: " + topologyid);

		} catch (Exception e) {
			// TODO Auto-generated catch block
			LOG.warn("Failed to remove StormBase " + topologyid + " from ZK", e);
		}
		return null;
	}

}