com.hazelcast.map.impl.querycache.subscriber.operation.ReadAndResetAccumulatorOperation Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, 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.querycache.subscriber.operation;
import com.hazelcast.map.impl.MapDataSerializerHook;
import com.hazelcast.map.impl.operation.MapOperation;
import com.hazelcast.map.impl.querycache.QueryCacheContext;
import com.hazelcast.map.impl.querycache.accumulator.Accumulator;
import com.hazelcast.map.impl.querycache.event.sequence.Sequenced;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.spi.PartitionAwareOperation;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static com.hazelcast.map.impl.querycache.utils.QueryCacheUtil.getAccumulators;
/**
* Reads all available items from the accumulator of the partition and resets it.
* This operation is used to retrieve the events which are buffered during the initial
* snapshot taking phase.
*
* @see com.hazelcast.map.impl.querycache.subscriber.operation.PublisherCreateOperation
*/
public class ReadAndResetAccumulatorOperation extends MapOperation implements PartitionAwareOperation {
private String cacheId;
private List eventDataList;
public ReadAndResetAccumulatorOperation() {
}
public ReadAndResetAccumulatorOperation(String mapName, String cacheId) {
super(mapName);
this.cacheId = cacheId;
}
@Override
public void run() throws Exception {
QueryCacheContext context = getQueryCacheContext();
Map accumulators = getAccumulators(context, name, cacheId);
Accumulator accumulator = accumulators.get(getPartitionId());
if (accumulator == null || accumulator.isEmpty()) {
return;
}
eventDataList = new ArrayList(accumulator.size());
for (Sequenced sequenced : accumulator) {
eventDataList.add(sequenced);
}
accumulator.reset();
}
@Override
public boolean returnsResponse() {
return true;
}
@Override
public Object getResponse() {
return eventDataList;
}
@Override
protected void writeInternal(ObjectDataOutput out) throws IOException {
super.writeInternal(out);
out.writeUTF(cacheId);
}
@Override
protected void readInternal(ObjectDataInput in) throws IOException {
super.readInternal(in);
cacheId = in.readUTF();
}
private QueryCacheContext getQueryCacheContext() {
return mapServiceContext.getQueryCacheContext();
}
@Override
public int getFactoryId() {
return MapDataSerializerHook.F_ID;
}
@Override
public int getId() {
return MapDataSerializerHook.READ_AND_RESET_ACCUMULATOR;
}
}