forked from hazelcast/hazelcast
/
ReadManyOperation.java
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/
ReadManyOperation.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.ringbuffer.impl.operations;
import com.hazelcast.core.IFunction;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.ringbuffer.impl.ReadResultSetImpl;
import com.hazelcast.ringbuffer.impl.RingbufferContainer;
import com.hazelcast.ringbuffer.impl.client.PortableReadResultSet;
import com.hazelcast.spi.BlockingOperation;
import com.hazelcast.spi.ReadonlyOperation;
import com.hazelcast.spi.WaitNotifyKey;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static com.hazelcast.ringbuffer.impl.RingbufferDataSerializerHook.READ_MANY_OPERATION;
public class ReadManyOperation<O> extends AbstractRingBufferOperation implements BlockingOperation, ReadonlyOperation {
transient long sequence;
private int minSize;
private int maxSize;
private long startSequence;
private IFunction<O, Boolean> filter;
private boolean returnPortable;
private transient ReadResultSetImpl<O, O> resultSet;
public ReadManyOperation() {
}
public ReadManyOperation(String name, long startSequence, int minSize, int maxSize, IFunction<O, Boolean> filter) {
this(name, startSequence, minSize, maxSize, filter, false);
}
public ReadManyOperation(String name, long startSequence, int minSize, int maxSize, IFunction<O, Boolean> filter,
boolean returnPortable) {
super(name);
this.minSize = minSize;
this.maxSize = maxSize;
this.startSequence = startSequence;
this.filter = filter;
this.returnPortable = returnPortable;
}
@Override
public void beforeRun() {
RingbufferContainer ringbuffer = getRingBufferContainer();
ringbuffer.checkBlockableReadSequence(startSequence);
}
@Override
public boolean shouldWait() {
if (resultSet == null) {
resultSet = new ReadResultSetImpl<O, O>(minSize, maxSize, getNodeEngine().getSerializationService(), filter);
sequence = startSequence;
}
RingbufferContainer ringbuffer = getRingBufferContainer();
if (minSize == 0) {
if (!ringbuffer.shouldWait(sequence)) {
sequence = ringbuffer.readMany(sequence, resultSet);
}
return false;
}
if (resultSet.isMinSizeReached()) {
// enough items have been read, we are done.
return false;
}
if (ringbuffer.shouldWait(sequence)) {
// the sequence is not readable
return true;
}
sequence = ringbuffer.readMany(sequence, resultSet);
return !resultSet.isMinSizeReached();
}
@Override
public void run() throws Exception {
// no-op; we already did the work in the shouldWait method.
}
@Override
public Object getResponse() {
if (returnPortable) {
final List<Data> items = new ArrayList<Data>(resultSet.size());
final long[] seqs = new long[resultSet.size()];
final Data[] dataItems = resultSet.getDataItems();
for (int k = 0; k < resultSet.size(); k++) {
items.add(dataItems[k]);
seqs[k] = resultSet.getSequence(k);
}
final PortableReadResultSet portableReadResultSet = new PortableReadResultSet(
resultSet.readCount(), items, seqs, resultSet.getNextSequenceToReadFrom());
return getNodeEngine().toData(portableReadResultSet);
}
return resultSet;
}
@Override
public WaitNotifyKey getWaitKey() {
RingbufferContainer ringbuffer = getRingBufferContainer();
return ringbuffer.getRingEmptyWaitNotifyKey();
}
@Override
public void onWaitExpire() {
//todo:
}
@Override
public int getId() {
return READ_MANY_OPERATION;
}
@Override
protected void writeInternal(ObjectDataOutput out) throws IOException {
super.writeInternal(out);
out.writeLong(startSequence);
out.writeInt(minSize);
out.writeInt(maxSize);
out.writeObject(filter);
out.writeBoolean(returnPortable);
}
@Override
protected void readInternal(ObjectDataInput in) throws IOException {
super.readInternal(in);
startSequence = in.readLong();
minSize = in.readInt();
maxSize = in.readInt();
filter = in.readObject();
returnPortable = in.readBoolean();
}
}