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/
MergeOperation.java
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/
MergeOperation.java
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/*
* Copyright (c) 2008-2018, 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.multimap.impl.operations;
import com.hazelcast.multimap.impl.MultiMapContainer;
import com.hazelcast.multimap.impl.MultiMapDataSerializerHook;
import com.hazelcast.multimap.impl.MultiMapMergeContainer;
import com.hazelcast.multimap.impl.MultiMapRecord;
import com.hazelcast.multimap.impl.MultiMapValue;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.spi.BackupAwareOperation;
import com.hazelcast.spi.Operation;
import com.hazelcast.spi.merge.SplitBrainMergePolicy;
import com.hazelcast.spi.merge.SplitBrainMergeTypes.MultiMapMergeTypes;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import static com.hazelcast.util.MapUtil.createHashMap;
/**
* Merges multiple {@link MultiMapMergeContainer} for split-brain healing with a {@link SplitBrainMergePolicy}.
*
* @since 3.10
*/
public class MergeOperation extends AbstractMultiMapOperation implements BackupAwareOperation {
private List<MultiMapMergeContainer> mergeContainers;
private SplitBrainMergePolicy<Collection<Object>, MultiMapMergeTypes> mergePolicy;
private transient Map<Data, Collection<MultiMapRecord>> resultMap;
public MergeOperation() {
}
public MergeOperation(String name, List<MultiMapMergeContainer> mergeContainers,
SplitBrainMergePolicy<Collection<Object>, MultiMapMergeTypes> mergePolicy) {
super(name);
this.mergeContainers = mergeContainers;
this.mergePolicy = mergePolicy;
}
@Override
public void run() throws Exception {
MultiMapContainer container = getOrCreateContainerWithoutAccess();
resultMap = createHashMap(mergeContainers.size());
for (MultiMapMergeContainer mergeContainer : mergeContainers) {
Data key = mergeContainer.getKey();
if (!container.canAcquireLock(key, getCallerUuid(), -1)) {
Object valueKey = getNodeEngine().getSerializationService().toObject(key);
getLogger().info("Skipped merging of locked key '" + valueKey + "' on MultiMap '" + name + "'");
continue;
}
MultiMapValue result = container.merge(mergeContainer, mergePolicy);
if (result != null) {
resultMap.put(key, result.getCollection(false));
}
}
response = !resultMap.isEmpty();
}
@Override
public boolean shouldBackup() {
return !resultMap.isEmpty();
}
@Override
public Operation getBackupOperation() {
return new MergeBackupOperation(name, resultMap);
}
@Override
protected void writeInternal(ObjectDataOutput out) throws IOException {
super.writeInternal(out);
out.writeInt(mergeContainers.size());
for (MultiMapMergeContainer container : mergeContainers) {
out.writeObject(container);
}
out.writeObject(mergePolicy);
}
@Override
protected void readInternal(ObjectDataInput in) throws IOException {
super.readInternal(in);
int size = in.readInt();
mergeContainers = new ArrayList<MultiMapMergeContainer>(size);
for (int i = 0; i < size; i++) {
MultiMapMergeContainer container = in.readObject();
mergeContainers.add(container);
}
mergePolicy = in.readObject();
}
@Override
public int getId() {
return MultiMapDataSerializerHook.MERGE_OPERATION;
}
}