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/*
 *  Copyright (c) 2017 Uber Technologies, Inc. ([email protected])
 *
 *  Licensed 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 com.uber.hoodie.func;

import com.uber.hoodie.common.util.queue.BoundedInMemoryExecutor;
import com.uber.hoodie.common.util.queue.BoundedInMemoryQueueConsumer;
import com.uber.hoodie.common.util.queue.BoundedInMemoryQueueProducer;
import com.uber.hoodie.common.util.queue.IteratorBasedQueueProducer;
import com.uber.hoodie.config.HoodieWriteConfig;
import java.util.Iterator;
import java.util.Optional;
import java.util.function.Function;
import org.apache.spark.TaskContext;
import org.apache.spark.TaskContext$;

public class SparkBoundedInMemoryExecutor extends BoundedInMemoryExecutor {

  // Need to set current spark thread's TaskContext into newly launched thread so that new thread can access
  // TaskContext properties.
  final TaskContext sparkThreadTaskContext;

  public SparkBoundedInMemoryExecutor(final HoodieWriteConfig hoodieConfig, final Iterator inputItr,
      BoundedInMemoryQueueConsumer consumer,
      Function bufferedIteratorTransform) {
    this(hoodieConfig, new IteratorBasedQueueProducer<>(inputItr), consumer, bufferedIteratorTransform);
  }

  public SparkBoundedInMemoryExecutor(final HoodieWriteConfig hoodieConfig,
      BoundedInMemoryQueueProducer producer,
      BoundedInMemoryQueueConsumer consumer,
      Function bufferedIteratorTransform) {
    super(hoodieConfig.getWriteBufferLimitBytes(), producer,
        Optional.of(consumer), bufferedIteratorTransform);
    this.sparkThreadTaskContext = TaskContext.get();
  }

  public void preExecute() {
    // Passing parent thread's TaskContext to newly launched thread for it to access original TaskContext properties.
    TaskContext$.MODULE$.setTaskContext(sparkThreadTaskContext);
  }
}