exec/java-exec/src/main/java/org/apache/drill/exec/physical/base/Sender.java


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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.drill.exec.physical.base;

import java.util.List;

import org.apache.drill.exec.proto.CoordinationProtos.DrillbitEndpoint;

import com.fasterxml.jackson.annotation.JsonProperty;

/**
 * A sender is one half of an exchange node operations. It is responsible for subdividing/cloning and sending a local
 * record set to a set of destination locations. This is typically only utilized at the level of the execution plan.
 */
public interface Sender extends FragmentRoot {
  
  /**
   * Get the list of destination endpoints that this Sender will be communicating with.
   * @return List of DrillbitEndpoints.
   */
  public abstract List<DrillbitEndpoint> getDestinations();
  
  /**
   * Get the receiver major fragment id that is opposite this sender.
   * @return
   */
  @JsonProperty("receiver-major-fragment")
  public int getOppositeMajorFragmentId();

}