runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/control/OutputReceiverFactory.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
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 * 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,
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package org.apache.beam.runners.fnexecution.control;

import org.apache.beam.sdk.fn.data.FnDataReceiver;

/** A factory that can create output receivers during an executable stage. */
public interface OutputReceiverFactory {
  /**
   * Get a new {@link RemoteOutputReceiver} for an output PCollection.
   *
   * <p>This call should only be invoked once per PCollection id per factory.
   */
  <OutputT> FnDataReceiver<OutputT> create(String pCollectionId);
}