package com.alibaba.jstorm.callback.impl;
import org.apache.log4j.Logger;
import com.alibaba.jstorm.callback.BaseCallback;
import com.alibaba.jstorm.cluster.StormBase;
import com.alibaba.jstorm.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;
}
}