org.apache.flink.streaming.runtime.tasks.StreamTaskFinishedOnRestoreSourceInput 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.streaming.runtime.tasks;
import org.apache.flink.streaming.api.operators.SourceOperator;
import org.apache.flink.streaming.runtime.io.DataInputStatus;
import org.apache.flink.streaming.runtime.io.StreamTaskSourceInput;
import java.util.concurrent.CompletableFuture;
/**
* A special source input implementation that immediately emit END_OF_INPUT. It is used for sources
* that finished on restore.
*/
public class StreamTaskFinishedOnRestoreSourceInput extends StreamTaskSourceInput {
private boolean emittedEndOfData = false;
public StreamTaskFinishedOnRestoreSourceInput(
SourceOperator operator, int inputGateIndex, int inputIndex) {
super(operator, inputGateIndex, inputIndex);
}
@Override
public DataInputStatus emitNext(DataOutput output) throws Exception {
if (emittedEndOfData) {
return DataInputStatus.END_OF_INPUT;
} else {
emittedEndOfData = true;
return DataInputStatus.END_OF_DATA;
}
}
@Override
public CompletableFuture getAvailableFuture() {
return AVAILABLE;
}
}