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().counter("numRecordsIn");
final Counter numRecordsOut = this.taskContext.getMetricGroup().counter("numRecordsOut");
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;
}
}