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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.common.util.queue;

import java.util.Iterator;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

/**
 * Iterator based producer which pulls entry from iterator and produces items for the queue
 *
 * @param  Item type produced for the buffer.
 */
public class IteratorBasedQueueProducer implements BoundedInMemoryQueueProducer {

  private static final Logger logger = LogManager.getLogger(IteratorBasedQueueProducer.class);

  // input iterator for producing items in the buffer.
  private final Iterator inputIterator;

  public IteratorBasedQueueProducer(Iterator inputIterator) {
    this.inputIterator = inputIterator;
  }

  @Override
  public void produce(BoundedInMemoryQueue queue) throws Exception {
    logger.info("starting to buffer records");
    while (inputIterator.hasNext()) {
      queue.insertRecord(inputIterator.next());
    }
    logger.info("finished buffering records");
  }
}