package org.infinispan.query.clustered;
import java.util.HashMap;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import org.apache.lucene.search.Sort;
import org.infinispan.AdvancedCache;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
/**
* DistributedLazyIterator.
*
* Lazily iterates on a distributed query
*
* @author Israel Lacerra <israeldl@gmail.com>
* @since 5.1
*/
public class DistributedLazyIterator<E> extends DistributedIterator<E> {
private final UUID queryId;
private final ExecutorService asyncExecutor;
private final ClusteredQueryInvoker invoker;
private static final Log log = LogFactory.getLog(DistributedLazyIterator.class);
public DistributedLazyIterator(Sort sort, int fetchSize, int resultSize, int maxResults, int firstResult, UUID id,
HashMap<UUID, ClusteredTopDocs> topDocsResponses, ExecutorService asyncExecutor, AdvancedCache<?, ?> cache) {
super(sort, fetchSize, resultSize, maxResults, firstResult, topDocsResponses, cache);
this.queryId = id;
this.asyncExecutor = asyncExecutor;
this.invoker = new ClusteredQueryInvoker(cache, asyncExecutor);
}
@Override
public void close() {
ClusteredQueryCommand killQuery = ClusteredQueryCommand.destroyLazyQuery(cache, queryId);
ClusteredQueryInvoker invoker = new ClusteredQueryInvoker(cache, asyncExecutor);
try {
invoker.broadcast(killQuery);
} catch (Exception e) {
log.error("Could not close the distributed iterator", e);
}
}
@Override
protected E fetchValue(int scoreIndex, ClusteredTopDocs topDoc) {
Object value = null;
try {
value = invoker.getValue(scoreIndex, topDoc.getNodeAddress(), queryId);
} catch (Exception e) {
log.error("Error while trying to remoting fetch next value: " + e.getMessage());
}
return (E) value;
}
}