org.apache.flink.runtime.operators.UnionWithTempOperator Maven / Gradle / Ivy

/*
 * 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.flink.runtime.operators;

import org.apache.flink.api.common.functions.Function;
import org.apache.flink.metrics.Counter;
import org.apache.flink.runtime.operators.util.metrics.CountingCollector;
import org.apache.flink.util.Collector;
import org.apache.flink.util.MutableObjectIterator;

public class UnionWithTempOperator implements Driver {
	
	private static final int CACHED_INPUT = 0;
	private static final int STREAMED_INPUT = 1;
	
	private TaskContext taskContext;
	
	private volatile boolean running;
	
	
	@Override
	public void setup(TaskContext context) {
		this.taskContext = context;
		this.running = true;
	}

	@Override
	public int getNumberOfInputs() {
		return 2;
	}
	
	@Override
	public int getNumberOfDriverComparators() {
		return 0;
	}

	@Override
	public Class getStubType() {
		return null; // no UDF
	}

	@Override
	public void prepare() {}

	@Override
	public void run() throws Exception {
		final Counter numRecordsIn = this.taskContext.getMetricGroup().getIOMetricGroup().getNumRecordsInCounter();
		final Counter numRecordsOut = this.taskContext.getMetricGroup().getIOMetricGroup().getNumRecordsOutCounter();
		
		final Collector output = new CountingCollector<>(this.taskContext.getOutputCollector(), numRecordsOut);
		T reuse = this.taskContext.getInputSerializer(STREAMED_INPUT).getSerializer().createInstance();
		T record;
		
		final MutableObjectIterator input = this.taskContext.getInput(STREAMED_INPUT);
		while (this.running && ((record = input.next(reuse)) != null)) {
			numRecordsIn.inc();
			output.collect(record);
		}
		
		final MutableObjectIterator cache = this.taskContext.getInput(CACHED_INPUT);
		while (this.running && ((record = cache.next(reuse)) != null)) {
			numRecordsIn.inc();
			output.collect(record);
		}
	}

	@Override
	public void cleanup() {}

	@Override
	public void cancel() {
		this.running = false;
	}
}