/*
* Copyright (c) 2008-2013, 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.queue.impl.operations;
import com.hazelcast.core.ItemEventType;
import com.hazelcast.monitor.impl.LocalQueueStatsImpl;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.queue.impl.QueueContainer;
import com.hazelcast.queue.impl.QueueDataSerializerHook;
import com.hazelcast.spi.Notifier;
import com.hazelcast.spi.Operation;
import com.hazelcast.spi.WaitNotifyKey;
import com.hazelcast.spi.impl.SerializableCollection;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Map;
/**
* This class drain items according to drain condition.
*/
public class DrainOperation extends QueueBackupAwareOperation implements Notifier {
private int maxSize;
private Map<Long, Data> dataMap;
public DrainOperation() {
}
public DrainOperation(String name, int maxSize) {
super(name);
this.maxSize = maxSize;
}
@Override
public void run() throws Exception {
QueueContainer container = getOrCreateContainer();
dataMap = container.drain(maxSize);
response = new SerializableCollection(new ArrayList<Data>(dataMap.values()));
}
@Override
public void afterRun() throws Exception {
LocalQueueStatsImpl stats = getQueueService().getLocalQueueStatsImpl(name);
stats.incrementOtherOperations();
for (Data data : dataMap.values()) {
publishEvent(ItemEventType.REMOVED, data);
}
}
@Override
public boolean shouldBackup() {
return dataMap.size() > 0;
}
@Override
public Operation getBackupOperation() {
return new DrainBackupOperation(name, dataMap.keySet());
}
@Override
protected void writeInternal(ObjectDataOutput out) throws IOException {
super.writeInternal(out);
out.writeInt(maxSize);
}
@Override
protected void readInternal(ObjectDataInput in) throws IOException {
super.readInternal(in);
maxSize = in.readInt();
}
@Override
public boolean shouldNotify() {
return dataMap.size() > 0;
}
@Override
public WaitNotifyKey getNotifiedKey() {
return getOrCreateContainer().getOfferWaitNotifyKey();
}
@Override
public int getId() {
return QueueDataSerializerHook.DRAIN;
}
}