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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.disk.iomanager;
import org.apache.flink.runtime.io.network.buffer.Buffer;
import org.apache.flink.runtime.util.NioBufferedFileInputStream;
import java.io.File;
import java.io.IOException;
import java.nio.channels.FileChannel;
import static org.apache.flink.util.Preconditions.checkArgument;
/**
* Helper class to read {@link Buffer}s from files into objects.
* Notice that the data in the file is a sequence of stream, and don't have any header to separate each buffer
* compared to {@link BufferFileChannelReader}.
*/
final public class StreamFileChannelReader {
public static boolean readBufferFromFileChannel(
FileChannel fileChannel, Buffer buffer, long offset, long length, File file)
throws IOException {
final long currPosition = fileChannel.position();
// We cannot afford the overhead of seeking before reading each buffer,
// so make sure the sequence of each ReadRequest.
if (currPosition != offset) {
throw new IllegalStateException("Expect fileChannel's position to be " + offset
+ ", but the current position is " + currPosition + ", fileId: " + file);
}
// Make sure this buffer can hold the required data size.
checkArgument(buffer.getSize() == 0, "Buffer not empty");
if (length > buffer.getMaxCapacity()) {
throw new IllegalStateException("Buffer is too small for data: " + buffer.getMaxCapacity()
+ " bytes available, but " + length
+ " needed. This is most likely due to an serialized event, which is larger than the buffer size.");
}
// Make sure this fileChannel has enough data to be read.
if ((fileChannel.size() - currPosition) < length) {
throw new IllegalStateException("Cannot read " + length + "bytes from this file, file size: "
+ fileChannel.size() + ", current position: " + currPosition + ", fileId: " + file);
}
fileChannel.read(buffer.getNioBuffer(0, (int) length));
buffer.setSize((int) length);
return fileChannel.size() - fileChannel.position() == 0;
}
public static boolean readBufferFromFileBufferedChannel(
NioBufferedFileInputStream in, Buffer buffer, long offset, long length, File file
) throws IOException {
final long currPosition = in.position();
// We cannot afford the overhead of seeking before reading each buffer,
// so make sure the sequence of each ReadRequest.
if (currPosition != offset) {
throw new IllegalStateException("Expect fileChannel's position to be " + offset
+ ", but the current position is " + currPosition + ", fileId: " + file);
}
// Make sure this buffer can hold the required data size.
checkArgument(buffer.getSize() == 0, "Buffer not empty");
if (length > buffer.getMaxCapacity()) {
throw new IllegalStateException("Buffer is too small for data: " + buffer.getMaxCapacity()
+ " bytes available, but " + length
+ " needed. This is most likely due to an serialized event, which is larger than the buffer size.");
}
// Make sure this fileChannel has enough data to be read.
if ((in.size() - currPosition) < length) {
throw new IllegalStateException("Cannot read " + length + "bytes from this file, file size: "
+ in.size() + ", current position: " + currPosition + ", fileId: " + file);
}
in.continuousRead(buffer.getNioBuffer(0, (int) length));
buffer.setSize((int) length);
return in.size() - in.position() == 0;
}
}
