package org.gcube.informationsystem.collector.impl.state;

import org.gcube.common.core.utils.logging.GCUBELog;
import org.gcube.informationsystem.collector.impl.persistence.AggregatorPersistentResource;
import org.gcube.informationsystem.collector.impl.utils.EntryEPRParser;
import org.gcube.informationsystem.collector.impl.xmlstorage.exist.State;

import org.globus.mds.aggregator.impl.AggregatorServiceGroupEntryRemovedCallback;
import org.globus.mds.aggregator.impl.AggregatorServiceGroupEntryResource;

/**
 * Whenever a AggregatorServiceGroupEntryResource is removed from an
 * AggregatorServiceGroupEntryHome, the corresponding remove method of this class will be invoked
 * passing as a parameter the instance of the resource that is about to be removed.
 * 
 * 
 * @author Manuele Simi (ISTI-CNR)
 * 
 */
public class ICAggregatorRemoveCallback implements AggregatorServiceGroupEntryRemovedCallback {

    private static GCUBELog logger = new GCUBELog(ICAggregatorRemoveCallback.class);

    /**
     * Creates a new Callback object
     * 
     */
    public ICAggregatorRemoveCallback() {
	super();
    }

    /**
     * Removes from the storage the supplied resource
     * 
     * @param entry the AggregatorServiceGroupEntryResource that is about to be removed
     * @throws Exception
     *             if the delete operation fails
     */
    public void remove(AggregatorServiceGroupEntryResource entry) throws Exception {

	logger.debug("ICAggregatorRemoveCallback invoked " + entry.getEntryEPR().toString());
	EntryEPRParser parser = new EntryEPRParser(entry.getEntryEPR());

	AggregatorPersistentResource res = new AggregatorPersistentResource();
	res.setEntryKey(parser.getEntryKey());
	res.setGroupKey(parser.getGroupKey());

	// mark the resource as no longer available
	synchronized (State.deletedResources) {
	    State.deletedResources.add(res);
	}

	// delete the resource from the database
	try {
	    State.storage_manager.retrieveAndDeleteResourceFromID(res.getID());
	} catch (Exception e) {
	    logger.error(State.logPrefix + "unable to remove resource: " + res.getID(), e);
	}

    }

}