org.apache.flink.runtime.io.disk.iomanager.AsynchronousBulkBlockReader 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 java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.flink.core.memory.MemorySegment;
/**
*
*/
public class AsynchronousBulkBlockReader extends AsynchronousFileIOChannel implements BulkBlockChannelReader {
private final ArrayList returnBuffers;
protected AsynchronousBulkBlockReader(FileIOChannel.ID channelID, RequestQueue requestQueue,
List sourceSegments, int numBlocks)
throws IOException
{
this (channelID, requestQueue, sourceSegments, numBlocks, new ArrayList(numBlocks));
}
private AsynchronousBulkBlockReader(FileIOChannel.ID channelID, RequestQueue requestQueue,
List sourceSegments, int numBlocks, ArrayList target)
throws IOException
{
super(channelID, requestQueue, new CollectingCallback(target), false);
this.returnBuffers = target;
// sanity check
if (sourceSegments.size() < numBlocks) {
throw new IllegalArgumentException("The list of source memory segments must contain at least" +
" as many segments as the number of blocks to read.");
}
// send read requests for all blocks
for (int i = 0; i < numBlocks; i++) {
readBlock(sourceSegments.remove(sourceSegments.size() - 1));
}
}
private void readBlock(MemorySegment segment) throws IOException {
addRequest(new SegmentReadRequest(this, segment));
}
@Override
public List getFullSegments() {
synchronized (this.closeLock) {
if (!this.isClosed() || this.requestsNotReturned.get() > 0) {
throw new IllegalStateException("Full segments can only be obtained after the reader was properly closed.");
}
}
return this.returnBuffers;
}
// --------------------------------------------------------------------------------------------
private static final class CollectingCallback implements RequestDoneCallback {
private final ArrayList list;
public CollectingCallback(ArrayList list) {
this.list = list;
}
@Override
public void requestSuccessful(MemorySegment buffer) {
list.add(buffer);
}
@Override
public void requestFailed(MemorySegment buffer, IOException e) {
list.add(buffer);
}
}
}