/*
 * 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.streampipes.pe.flink.sink.elasticsearch.elastic;

import org.elasticsearch.action.ActionRequest;
import org.elasticsearch.action.DocWriteRequest;
import org.elasticsearch.action.bulk.BulkProcessor;

import java.util.concurrent.atomic.AtomicLong;

/**
 * Implementation of a {@link RequestIndexer}, using a {@link BulkProcessor}.
 * {@link ActionRequest ActionRequests} will be converted to {@link DocWriteRequest}
 * and will be buffered before sending a bulk request to the Elasticsearch cluster.
 */
public class BulkProcessorIndexer implements RequestIndexer {

  private final BulkProcessor bulkProcessor;
  private final boolean flushOnCheckpoint;
  private final AtomicLong numPendingRequestsRef;

  public BulkProcessorIndexer(BulkProcessor bulkProcessor,
                              boolean flushOnCheckpoint,
                              AtomicLong numPendingRequests) {
    this.bulkProcessor = bulkProcessor;
    this.flushOnCheckpoint = flushOnCheckpoint;
    this.numPendingRequestsRef = numPendingRequests;
  }

  @Override
  public void add(ActionRequest... actionRequests) {
    for (ActionRequest actionRequest : actionRequests) {
      if (flushOnCheckpoint) {
        numPendingRequestsRef.getAndIncrement();
      }
      this.bulkProcessor.add((DocWriteRequest) actionRequest);
    }
  }
}
