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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.streaming.api.operators.sorted.state;

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.CheckpointStorageAccess;
import org.apache.flink.runtime.state.CheckpointableKeyedStateBackend;
import org.apache.flink.runtime.state.CompletedCheckpointStorageLocation;
import org.apache.flink.runtime.state.DefaultOperatorStateBackendBuilder;
import org.apache.flink.runtime.state.KeyGroupRange;
import org.apache.flink.runtime.state.KeyedStateHandle;
import org.apache.flink.runtime.state.OperatorStateBackend;
import org.apache.flink.runtime.state.OperatorStateHandle;
import org.apache.flink.runtime.state.StateBackend;
import org.apache.flink.runtime.state.ttl.TtlTimeProvider;

import javax.annotation.Nonnull;

import java.util.Collection;

/** A simple {@link StateBackend} which is used in a BATCH style execution. */
public class BatchExecutionStateBackend implements StateBackend {
    @Override
    public CompletedCheckpointStorageLocation resolveCheckpoint(String externalPointer) {
        throw new UnsupportedOperationException(
                "Checkpoints are not supported in a single key state backend");
    }

    @Override
    public CheckpointStorageAccess createCheckpointStorage(JobID jobId) {
        return new NonCheckpointingStorageAccess();
    }

    @Override
    public  CheckpointableKeyedStateBackend createKeyedStateBackend(
            Environment env,
            JobID jobID,
            String operatorIdentifier,
            TypeSerializer keySerializer,
            int numberOfKeyGroups,
            KeyGroupRange keyGroupRange,
            TaskKvStateRegistry kvStateRegistry,
            TtlTimeProvider ttlTimeProvider,
            MetricGroup metricGroup,
            @Nonnull Collection stateHandles,
            CloseableRegistry cancelStreamRegistry) {
        return new BatchExecutionKeyedStateBackend<>(keySerializer, keyGroupRange);
    }

    @Override
    public OperatorStateBackend createOperatorStateBackend(
            Environment env,
            String operatorIdentifier,
            @Nonnull Collection stateHandles,
            CloseableRegistry cancelStreamRegistry)
            throws Exception {
        return new DefaultOperatorStateBackendBuilder(
                        env.getUserCodeClassLoader().asClassLoader(),
                        env.getExecutionConfig(),
                        false,
                        stateHandles,
                        cancelStreamRegistry)
                .build();
    }
}