org.apache.flink.runtime.io.disk.iomanager.AsynchronousBufferFileWriter 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.io.disk.iomanager;
import org.apache.flink.runtime.io.network.buffer.Buffer;
import org.apache.flink.runtime.util.event.NotificationListener;
import org.apache.flink.util.ExceptionUtils;
import java.io.IOException;
public class AsynchronousBufferFileWriter extends AsynchronousFileIOChannel implements BufferFileWriter {
private static final RecyclingCallback CALLBACK = new RecyclingCallback();
private final int bufferSize;
private final boolean withHeader;
protected AsynchronousBufferFileWriter(ID channelID, IORequestScheduler requestScheduler,
int bufferSize, boolean withHeader) throws IOException {
super(channelID, requestScheduler, CALLBACK, true);
this.bufferSize = bufferSize;
this.withHeader = withHeader;
}
protected AsynchronousBufferFileWriter(ID channelID, IORequestScheduler requestScheduler,
int bufferSize) throws IOException {
this(channelID, requestScheduler, bufferSize, true);
}
/**
* Writes the given block asynchronously.
*
* @param buffer
* the buffer to be written (will be recycled when done)
*
* @throws IOException
* thrown if adding the write operation fails
*/
@Override
public void writeBlock(Buffer buffer) throws IOException {
try {
// if successfully added, the buffer will be recycled after the write operation
if (withHeader) {
addRequest(new BufferWriteRequest(this, buffer, bufferSize));
} else {
addRequest(new StreamWriteRequest(this, buffer, bufferSize));
}
} catch (Throwable e) {
// if not added, we need to recycle here
buffer.recycleBuffer();
ExceptionUtils.rethrowIOException(e);
}
}
@Override
public int getNumberOfOutstandingRequests() {
return requestsNotReturned.get();
}
@Override
public boolean registerAllRequestsProcessedListener(NotificationListener listener) throws IOException {
return super.registerAllRequestsProcessedListener(listener);
}
/**
* Recycles the buffer after the I/O request.
*/
private static class RecyclingCallback implements RequestDoneCallback {
@Override
public void requestSuccessful(Buffer buffer) {
buffer.recycleBuffer();
}
@Override
public void requestFailed(Buffer buffer, IOException e) {
buffer.recycleBuffer();
}
}
}