/*
* 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.map.impl.query;
import com.hazelcast.query.Predicate;
import com.hazelcast.query.impl.QueryableEntry;
import com.hazelcast.spi.exception.RetryableHazelcastException;
import java.util.ArrayList;
import java.util.Collection;
/**
* Implementation of the {@link PartitionScanExecutor} which executes the partition scan in a sequential-fashion
* in the calling thread.
*/
public class CallerRunsPartitionScanExecutor implements PartitionScanExecutor {
private final PartitionScanRunner partitionScanRunner;
public CallerRunsPartitionScanExecutor(PartitionScanRunner partitionScanRunner) {
this.partitionScanRunner = partitionScanRunner;
}
@Override
public Collection<QueryableEntry> execute(String mapName, Predicate predicate, Collection<Integer> partitions) {
RetryableHazelcastException storedException = null;
Collection<QueryableEntry> result = new ArrayList<QueryableEntry>();
for (Integer partitionId : partitions) {
try {
result.addAll(partitionScanRunner.run(mapName, predicate, partitionId));
} catch (RetryableHazelcastException e) {
// RetryableHazelcastException are stored and re-thrown later. this is to ensure all partitions
// are touched as when the parallel execution was used.
// see discussion at https://github.com/hazelcast/hazelcast/pull/5049#discussion_r28773099 for details.
if (storedException == null) {
storedException = e;
}
}
}
if (storedException != null) {
throw storedException;
}
return result;
}
}