/*
 * 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.beam.runners.flink.streaming;

import java.io.IOException;
import java.util.Collection;
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.AbstractKeyedStateBackend;
import org.apache.flink.runtime.state.KeyGroupRange;
import org.apache.flink.runtime.state.KeyedStateBackendParametersImpl;
import org.apache.flink.runtime.state.KeyedStateHandle;
import org.apache.flink.runtime.state.OperatorStateBackend;
import org.apache.flink.runtime.state.OperatorStateBackendParametersImpl;
import org.apache.flink.runtime.state.OperatorStateHandle;
import org.apache.flink.runtime.state.hashmap.HashMapStateBackend;
import org.apache.flink.runtime.state.ttl.TtlTimeProvider;

class MemoryStateBackendWrapper {
  static <K> AbstractKeyedStateBackend<K> createKeyedStateBackend(
      Environment env,
      JobID jobID,
      String operatorIdentifier,
      TypeSerializer<K> keySerializer,
      int numberOfKeyGroups,
      KeyGroupRange keyGroupRange,
      TaskKvStateRegistry kvStateRegistry,
      TtlTimeProvider ttlTimeProvider,
      MetricGroup metricGroup,
      Collection<KeyedStateHandle> stateHandles,
      CloseableRegistry cancelStreamRegistry)
      throws IOException {

    HashMapStateBackend backend = new HashMapStateBackend();
    return backend.createKeyedStateBackend(
        new KeyedStateBackendParametersImpl<>(
            env,
            jobID,
            operatorIdentifier,
            keySerializer,
            numberOfKeyGroups,
            keyGroupRange,
            kvStateRegistry,
            ttlTimeProvider,
            metricGroup,
            stateHandles,
            cancelStreamRegistry));
  }

  static OperatorStateBackend createOperatorStateBackend(
      Environment env,
      String operatorIdentifier,
      Collection<OperatorStateHandle> stateHandles,
      CloseableRegistry cancelStreamRegistry)
      throws Exception {
    HashMapStateBackend backend = new HashMapStateBackend();
    return backend.createOperatorStateBackend(
        new OperatorStateBackendParametersImpl(
            env, operatorIdentifier, stateHandles, cancelStreamRegistry));
  }
}
