org.apache.flink.runtime.io.network.api.writer.MultipleRecordWriters Maven / Gradle / Ivy
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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.flink.runtime.io.network.api.writer;
import org.apache.flink.core.io.IOReadableWritable;
import org.apache.flink.runtime.event.AbstractEvent;
import org.apache.flink.util.ExceptionUtils;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import static org.apache.flink.util.Preconditions.checkNotNull;
/**
* The specific delegate implementation for the multiple outputs case.
*/
public class MultipleRecordWriters implements RecordWriterDelegate {
/** The real record writer instances for this delegate. */
private final List> recordWriters;
/**
* Maintains the respective record writer futures to avoid allocating new arrays every time
* in {@link #getAvailableFuture()}.
*/
private final CompletableFuture[] futures;
public MultipleRecordWriters(List> recordWriters) {
this.recordWriters = checkNotNull(recordWriters);
this.futures = new CompletableFuture[recordWriters.size()];
}
@Override
public void broadcastEvent(AbstractEvent event) throws IOException {
IOException exception = null;
for (RecordWriter recordWriter : recordWriters) {
try {
recordWriter.broadcastEvent(event);
} catch (IOException e) {
exception = ExceptionUtils.firstOrSuppressed(
new IOException("Could not send event to downstream tasks.", e), exception);
}
}
if (exception != null) {
throw exception;
}
}
@Override
public RecordWriter getRecordWriter(int outputIndex) {
return recordWriters.get(outputIndex);
}
@Override
public CompletableFuture getAvailableFuture() {
for (int i = 0; i < futures.length; i++) {
futures[i] = recordWriters.get(i).getAvailableFuture();
}
return CompletableFuture.allOf(futures);
}
@Override
public boolean isAvailable() {
for (RecordWriter recordWriter : recordWriters) {
if (!recordWriter.isAvailable()) {
return false;
}
}
return true;
}
@Override
public void close() {
for (RecordWriter recordWriter : recordWriters) {
recordWriter.close();
}
}
}