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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.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
/**
* A receiver is one half of an exchange operator. The receiver is responsible for taking in one or more streams from
* corresponding Senders. Receivers are a special type of Physical Operator that are typically only expressed within the execution plan.
*/
public interface Receiver extends FragmentLeaf {
/**
* A receiver is expecting streams from one or more providing endpoints. This method should return a list of the expected sending endpoints.
* @return List of counterpart sending DrillbitEndpoints.
*/
public abstract List<DrillbitEndpoint> getProvidingEndpoints();
/**
* Whether or not this receive supports out of order exchange. This provides a hint for the scheduling node on whether
* the receiver can start work if only a subset of all sending endpoints are currently providing data. A random
* receiver would supports this form of operation. A NWAY receiver would not.
*
* @return True if this receiver supports working on a streaming/out of order input.
*/
@JsonIgnore
public abstract boolean supportsOutOfOrderExchange();
@JsonProperty("sender-major-fragment")
public int getOppositeMajorFragmentId();
}
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