package org.infinispan.query.clustered;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Sort;
import org.hibernate.search.exception.SearchException;
import org.hibernate.search.spi.SearchIntegrator;
import org.infinispan.AdvancedCache;
import org.infinispan.query.CacheQuery;
import org.infinispan.query.FetchOptions;
import org.infinispan.query.ResultIterator;
import org.infinispan.query.backend.KeyTransformationHandler;
import org.infinispan.query.impl.CacheQueryImpl;
/**
* A extension of CacheQueryImpl used for distributed queries.
*
* @author Israel Lacerra <israeldl@gmail.com>
* @since 5.1
*/
public class ClusteredCacheQueryImpl<E> extends CacheQueryImpl<E> {
private Sort sort;
private Integer resultSize;
private final ExecutorService asyncExecutor;
// like QueryHits.DEFAULT_TOP_DOC_RETRIEVAL_SIZE = 100;
// (just to have the same default size of not clustered queries)
private int maxResults = 100;
private int firstResult = 0;
public ClusteredCacheQueryImpl(Query luceneQuery, SearchIntegrator searchFactory,
ExecutorService asyncExecutor, AdvancedCache<?, ?> cache, KeyTransformationHandler keyTransformationHandler, Class<?>... classes) {
super(luceneQuery, searchFactory, cache, keyTransformationHandler, null, classes);
this.asyncExecutor = asyncExecutor;
this.hSearchQuery = searchFactory.createHSQuery(luceneQuery, classes);
}
@Override
public CacheQuery<E> maxResults(int maxResults) {
this.maxResults = maxResults;
return super.maxResults(maxResults);
}
@Override
public CacheQuery<E> firstResult(int firstResult) {
this.firstResult = firstResult;
return this;
}
@Override
public CacheQuery<E> sort(Sort sort) {
this.sort = sort;
return super.sort(sort);
}
@Override
public int getResultSize() {
int accumulator;
if (resultSize == null) {
ClusteredQueryCommand command = ClusteredQueryCommand.getResultSize(hSearchQuery, cache);
ClusteredQueryInvoker invoker = new ClusteredQueryInvoker(cache, asyncExecutor);
List<QueryResponse> responses = invoker.broadcast(command);
accumulator = 0;
for (QueryResponse response : responses) {
accumulator += response.getResultSize();
}
resultSize = Integer.valueOf(accumulator);
} else {
accumulator = resultSize.intValue();
}
return accumulator;
}
@Override
public ResultIterator<E> iterator(FetchOptions fetchOptions) throws SearchException {
hSearchQuery.maxResults(getNodeMaxResults());
switch (fetchOptions.getFetchMode()) {
case EAGER: {
ClusteredQueryCommand command = ClusteredQueryCommand.createEagerIterator(hSearchQuery, cache);
HashMap<UUID, ClusteredTopDocs> topDocsResponses = broadcastQuery(command);
return new DistributedIterator<>(sort,
fetchOptions.getFetchSize(), this.resultSize, maxResults,
firstResult, topDocsResponses, cache);
}
case LAZY: {
UUID lazyItId = UUID.randomUUID();
ClusteredQueryCommand command = ClusteredQueryCommand.createLazyIterator(hSearchQuery, cache, lazyItId);
HashMap<UUID, ClusteredTopDocs> topDocsResponses = broadcastQuery(command);
// Make a sort copy to avoid reversed results
return new DistributedLazyIterator<>(sort,
fetchOptions.getFetchSize(), this.resultSize, maxResults,
firstResult, lazyItId, topDocsResponses, asyncExecutor, cache);
}
default:
throw new IllegalArgumentException("Unknown FetchMode " + fetchOptions.getFetchMode());
}
}
// number of results of each node of cluster
private int getNodeMaxResults() {
return maxResults + firstResult;
}
private HashMap<UUID, ClusteredTopDocs> broadcastQuery(ClusteredQueryCommand command) {
ClusteredQueryInvoker invoker = new ClusteredQueryInvoker(cache, asyncExecutor);
HashMap<UUID, ClusteredTopDocs> topDocsResponses = new HashMap<>();
int resultSize = 0;
List<QueryResponse> responses = invoker.broadcast(command);
for (QueryResponse queryResponse : responses) {
ClusteredTopDocs topDocs = new ClusteredTopDocs(queryResponse.getTopDocs(), queryResponse.getNodeUUID());
resultSize += queryResponse.getResultSize();
topDocs.setNodeAddress(queryResponse.getAddress());
topDocsResponses.put(queryResponse.getNodeUUID(), topDocs);
}
this.resultSize = resultSize;
return topDocsResponses;
}
@Override
public List<E> list() throws SearchException {
List<E> values = new ArrayList<>();
try (ResultIterator<E> iterator = iterator(new FetchOptions().fetchMode(FetchOptions.FetchMode.EAGER))) {
while (iterator.hasNext()) {
values.add(iterator.next());
}
}
return values;
}
@Override
public CacheQuery<E> timeout(long timeout, TimeUnit timeUnit) {
throw new UnsupportedOperationException("Clustered queries do not support timeouts yet."); // TODO
}
}