/*
* 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.runtime.jobgraph.tasks.AbstractInvokable;
import org.apache.flink.runtime.operators.chaining.ChainedDriver;
import org.apache.flink.runtime.operators.chaining.ExceptionInChainedStubException;
/**
* A chained driver that just passes on the input as the output
* @param <IT> The type of the input
*/
public class NoOpChainedDriver<IT> extends ChainedDriver<IT, IT> {
@Override
public void setup(AbstractInvokable parent) {
}
@Override
public void openTask() throws Exception {
}
@Override
public void closeTask() throws Exception {
}
@Override
public void cancelTask() {
}
@Override
public Function getStub() {
return null;
}
@Override
public String getTaskName() {
return this.taskName;
}
@Override
public void collect(IT record) {
try {
this.numRecordsIn.inc();
this.outputCollector.collect(record);
} catch (Exception ex) {
throw new ExceptionInChainedStubException(this.taskName, ex);
}
}
@Override
public void close() {
this.outputCollector.close();
}
}