/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.client.impl.protocol.task.map;
import com.hazelcast.aggregation.Aggregator;
import com.hazelcast.client.impl.protocol.ClientMessage;
import com.hazelcast.instance.Node;
import com.hazelcast.map.impl.query.QueryResult;
import com.hazelcast.map.impl.query.QueryResultUtils;
import com.hazelcast.nio.Connection;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.query.Predicate;
import com.hazelcast.query.TruePredicate;
import com.hazelcast.spi.serialization.SerializationService;
import com.hazelcast.util.IterationType;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;
public abstract class DefaultMapProjectMessageTask<P>
extends AbstractMapQueryMessageTask<P,
QueryResult, QueryResult, List<Data>> {
public DefaultMapProjectMessageTask(ClientMessage clientMessage, Node node, Connection connection) {
super(clientMessage, node, connection);
}
@Override
protected IterationType getIterationType() {
return IterationType.VALUE;
}
@Override
protected Aggregator<?, ?> getAggregator() {
return null;
}
@Override
protected Predicate getPredicate() {
return TruePredicate.INSTANCE;
}
@Override
protected void extractAndAppendResult(Collection<QueryResult> results, QueryResult result) {
results.add(result);
}
@Override
protected List<Data> reduce(Collection<QueryResult> results) {
if (results.isEmpty()) {
return Collections.emptyList();
}
QueryResult combinedResult = null;
for (QueryResult result : results) {
if (combinedResult == null) {
combinedResult = result;
} else {
combinedResult.combine(result);
}
}
Set result = QueryResultUtils.transformToSet(nodeEngine.getSerializationService(), combinedResult,
getPredicate(), IterationType.VALUE, false);
List<Data> serialized = new ArrayList<Data>(result.size());
SerializationService serializationService = nodeEngine.getSerializationService();
for (Object row : result) {
serialized.add(serializationService.toData(row));
}
return serialized;
}
}