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ReadByteChannel.java
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ReadByteChannel.java
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/*
* SPDX-License-Identifier: Apache-2.0
*
* Copyright 2023 Japplis.
*
* Licensed 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
*
* https://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 com.japplis.virtually;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.util.concurrent.locks.ReentrantLock;
/**
* A ReadableByteChannel that isn't 'synchronized' when reading the input stream but that uses a ReentrantLock to be virtual thread friendly.
*
* @author Anthony Goubard - Japplis
*/
public class ReadByteChannel implements ReadableByteChannel {
private boolean isOpen = true;
private final InputStream inputStream;
private final ReentrantLock channelLock = new ReentrantLock();
public ReadByteChannel(InputStream inputStream) {
this.inputStream = inputStream;
}
@Override
public int read(ByteBuffer dest) throws IOException {
if (dest.isReadOnly()) {
throw new IllegalArgumentException("The byte buffer should not be read only");
}
if (!isOpen()) {
throw new ClosedChannelException();
}
try {
channelLock.lockInterruptibly();
} catch (InterruptedException ex) {
close();
throw new ClosedByInterruptException();
}
int byteRead = 0;
int totalRead = 0;
try {
while (byteRead >= 0) {
if (!isOpen()) {
throw new AsynchronousCloseException();
}
int destBufferSize = dest.remaining();
if (destBufferSize <= 0) break;
byte[] readBuffer = new byte[destBufferSize];
byteRead = inputStream.read(readBuffer);
if (byteRead > 0) {
totalRead += byteRead;
dest.put(readBuffer, 0, byteRead);
}
}
} finally {
channelLock.unlock();
}
return totalRead;
}
@Override
public boolean isOpen() {
return isOpen;
}
@Override
public void close() throws IOException {
isOpen = false;
}
}