org.apache.flink.runtime.state.OperatorStreamStateHandle 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,
 * 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 org.apache.flink.runtime.state;

import org.apache.flink.core.fs.FSDataInputStream;
import org.apache.flink.util.Preconditions;

import java.io.IOException;
import java.util.Map;
import java.util.Optional;

/**
 * State handle for partitionable operator state. Besides being a {@link StreamStateHandle}, this
 * also provides a map that contains the offsets to the partitions of named states in the stream.
 */
public class OperatorStreamStateHandle implements OperatorStateHandle {

    private static final long serialVersionUID = 35876522969227335L;

    /** unique state name -> offsets for available partitions in the handle stream */
    private final Map stateNameToPartitionOffsets;

    private final StreamStateHandle delegateStateHandle;

    public OperatorStreamStateHandle(
            Map stateNameToPartitionOffsets,
            StreamStateHandle delegateStateHandle) {

        this.delegateStateHandle = Preconditions.checkNotNull(delegateStateHandle);
        this.stateNameToPartitionOffsets = Preconditions.checkNotNull(stateNameToPartitionOffsets);
    }

    @Override
    public Map getStateNameToPartitionOffsets() {
        return stateNameToPartitionOffsets;
    }

    @Override
    public void discardState() throws Exception {
        delegateStateHandle.discardState();
    }

    @Override
    public long getStateSize() {
        return delegateStateHandle.getStateSize();
    }

    @Override
    public FSDataInputStream openInputStream() throws IOException {
        return delegateStateHandle.openInputStream();
    }

    @Override
    public Optional asBytesIfInMemory() {
        return delegateStateHandle.asBytesIfInMemory();
    }

    @Override
    public StreamStateHandle getDelegateStateHandle() {
        return delegateStateHandle;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        if (!(o instanceof OperatorStreamStateHandle)) {
            return false;
        }

        OperatorStreamStateHandle that = (OperatorStreamStateHandle) o;

        if (stateNameToPartitionOffsets.size() != that.stateNameToPartitionOffsets.size()) {
            return false;
        }

        for (Map.Entry entry : stateNameToPartitionOffsets.entrySet()) {
            if (!entry.getValue().equals(that.stateNameToPartitionOffsets.get(entry.getKey()))) {
                return false;
            }
        }

        return delegateStateHandle.equals(that.delegateStateHandle);
    }

    @Override
    public int hashCode() {
        int result = delegateStateHandle.hashCode();
        for (Map.Entry entry : stateNameToPartitionOffsets.entrySet()) {

            int entryHash = entry.getKey().hashCode();
            if (entry.getValue() != null) {
                entryHash += entry.getValue().hashCode();
            }
            result = 31 * result + entryHash;
        }
        return result;
    }

    @Override
    public String toString() {
        return "OperatorStateHandle{"
                + "stateNameToPartitionOffsets="
                + stateNameToPartitionOffsets
                + ", delegateStateHandle="
                + delegateStateHandle
                + '}';
    }
}