org.apache.flink.runtime.state.PartitionableListState Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.state;
import org.apache.flink.api.common.state.ListState;
import org.apache.flink.core.fs.FSDataOutputStream;
import org.apache.flink.core.memory.DataOutputView;
import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
import org.apache.flink.util.Preconditions;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* Implementation of operator list state.
*
* @param the type of an operator state partition.
*/
public final class PartitionableListState implements ListState {
/**
* Meta information of the state, including state name, assignment mode, and typeSerializer
*/
private RegisteredOperatorStateBackendMetaInfo stateMetaInfo;
/**
* The internal list the holds the elements of the state
*/
private final ArrayList internalList;
/**
* A typeSerializer that allows to perform deep copies of internalList
*/
private final ArrayListSerializer internalListCopySerializer;
PartitionableListState(RegisteredOperatorStateBackendMetaInfo stateMetaInfo) {
this(stateMetaInfo, new ArrayList());
}
private PartitionableListState(
RegisteredOperatorStateBackendMetaInfo stateMetaInfo,
ArrayList internalList) {
this.stateMetaInfo = Preconditions.checkNotNull(stateMetaInfo);
this.internalList = Preconditions.checkNotNull(internalList);
this.internalListCopySerializer = new ArrayListSerializer<>(stateMetaInfo.getPartitionStateSerializer());
}
private PartitionableListState(PartitionableListState toCopy) {
this(toCopy.stateMetaInfo.deepCopy(), toCopy.internalListCopySerializer.copy(toCopy.internalList));
}
public void setStateMetaInfo(RegisteredOperatorStateBackendMetaInfo stateMetaInfo) {
this.stateMetaInfo = stateMetaInfo;
}
public RegisteredOperatorStateBackendMetaInfo getStateMetaInfo() {
return stateMetaInfo;
}
public PartitionableListState deepCopy() {
return new PartitionableListState<>(this);
}
@Override
public void clear() {
internalList.clear();
}
@Override
public Iterable get() {
return internalList;
}
@Override
public void add(S value) {
Preconditions.checkNotNull(value, "You cannot add null to a ListState.");
internalList.add(value);
}
@Override
public String toString() {
return "PartitionableListState{" +
"stateMetaInfo=" + stateMetaInfo +
", internalList=" + internalList +
'}';
}
public long[] write(FSDataOutputStream out) throws IOException {
long[] partitionOffsets = new long[internalList.size()];
DataOutputView dov = new DataOutputViewStreamWrapper(out);
for (int i = 0; i < internalList.size(); ++i) {
S element = internalList.get(i);
partitionOffsets[i] = out.getPos();
getStateMetaInfo().getPartitionStateSerializer().serialize(element, dov);
}
return partitionOffsets;
}
@Override
public void update(List values) {
internalList.clear();
addAll(values);
}
@Override
public void addAll(List values) {
if (values != null && !values.isEmpty()) {
internalList.addAll(values);
}
}
}