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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.annotation.PublicEvolving;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.JobID;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.core.fs.CloseableRegistry;
import org.apache.flink.metrics.MetricGroup;
import org.apache.flink.runtime.execution.Environment;
import org.apache.flink.runtime.query.TaskKvStateRegistry;
import org.apache.flink.runtime.state.metrics.LatencyTrackingStateConfig;
import org.apache.flink.runtime.state.ttl.TtlTimeProvider;

import javax.annotation.Nonnull;

import java.io.IOException;
import java.util.Collection;

/**
 * An abstract base implementation of the {@link StateBackend} interface.
 *
 * 

This class has currently no contents and only kept to not break the prior class hierarchy for * users. */ @PublicEvolving public abstract class AbstractStateBackend implements StateBackend, java.io.Serializable { private static final long serialVersionUID = 4620415814639230247L; public static StreamCompressionDecorator getCompressionDecorator( ExecutionConfig executionConfig) { if (executionConfig != null && executionConfig.isUseSnapshotCompression()) { return SnappyStreamCompressionDecorator.INSTANCE; } else { return UncompressedStreamCompressionDecorator.INSTANCE; } } protected LatencyTrackingStateConfig.Builder latencyTrackingConfigBuilder = LatencyTrackingStateConfig.newBuilder(); // ------------------------------------------------------------------------ // State Backend - State-Holding Backends // ------------------------------------------------------------------------ @Override public abstract AbstractKeyedStateBackend createKeyedStateBackend( Environment env, JobID jobID, String operatorIdentifier, TypeSerializer keySerializer, int numberOfKeyGroups, KeyGroupRange keyGroupRange, TaskKvStateRegistry kvStateRegistry, TtlTimeProvider ttlTimeProvider, MetricGroup metricGroup, @Nonnull Collection stateHandles, CloseableRegistry cancelStreamRegistry) throws IOException; @Override public abstract OperatorStateBackend createOperatorStateBackend( Environment env, String operatorIdentifier, @Nonnull Collection stateHandles, CloseableRegistry cancelStreamRegistry) throws Exception; }





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