org.apache.beam.fn.harness.data.MultiplexingFnDataReceiver.java Source code

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Here is the source code for org.apache.beam.fn.harness.data.MultiplexingFnDataReceiver.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.beam.fn.harness.data;

import com.google.common.collect.Iterables;
import java.util.Collection;
import org.apache.beam.sdk.fn.data.FnDataReceiver;

/**
 * A {@link FnDataReceiver} which forwards all received inputs to a collection of {@link
 * FnDataReceiver receivers}.
 */
public class MultiplexingFnDataReceiver<T> implements FnDataReceiver<T> {
    public static <T> FnDataReceiver<T> forConsumers(Collection<FnDataReceiver<T>> consumers) {
        if (consumers.size() == 1) {
            return Iterables.getOnlyElement(consumers);
        }
        return new MultiplexingFnDataReceiver<>(consumers);
    }

    private final Collection<FnDataReceiver<T>> consumers;

    private MultiplexingFnDataReceiver(Collection<FnDataReceiver<T>> consumers) {
        this.consumers = consumers;
    }

    @Override
    public void accept(T input) throws Exception {
        for (FnDataReceiver<T> consumer : consumers) {
            consumer.accept(input);
        }
    }
}