com.hazelcast.map.impl.querycache.subscriber.operation.SetReadCursorOperation 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.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.spi.impl.operationservice.PartitionAwareOperation;
import java.io.IOException;
import static com.hazelcast.internal.util.Preconditions.checkHasText;
import static com.hazelcast.internal.util.Preconditions.checkPositive;
import static com.hazelcast.map.impl.querycache.utils.QueryCacheUtil.getAccumulatorOrNull;
/**
* Sets read cursor of {@code Accumulator} in
* this partition to the supplied sequence number.
*
* @see Accumulator#setHead
*/
public class SetReadCursorOperation
extends MapOperation implements PartitionAwareOperation {
private long sequence;
private String cacheId;
private transient boolean result;
public SetReadCursorOperation() {
}
public SetReadCursorOperation(String mapName, String cacheId, long sequence, int ignored) {
super(checkHasText(mapName, "mapName"));
checkPositive(sequence, "sequence");
this.cacheId = checkHasText(cacheId, "cacheId");
this.sequence = sequence;
}
@Override
protected void runInternal() {
this.result = setReadCursor();
}
@Override
public Object getResponse() {
return result;
}
@Override
protected void writeInternal(ObjectDataOutput out) throws IOException {
super.writeInternal(out);
out.writeUTF(cacheId);
out.writeLong(sequence);
}
@Override
protected void readInternal(ObjectDataInput in) throws IOException {
super.readInternal(in);
cacheId = in.readUTF();
sequence = in.readLong();
}
private boolean setReadCursor() {
QueryCacheContext context = getContext();
Accumulator accumulator = getAccumulatorOrNull(context, name, cacheId, getPartitionId());
if (accumulator == null) {
return false;
}
return accumulator.setHead(sequence);
}
private QueryCacheContext getContext() {
return mapServiceContext.getQueryCacheContext();
}
@Override
public int getFactoryId() {
return MapDataSerializerHook.F_ID;
}
@Override
public int getClassId() {
return MapDataSerializerHook.SET_READ_CURSOR;
}
}