/*
* 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.nifi.remote.io.socket;
import java.io.IOException;
import java.io.OutputStream;
import java.net.SocketTimeoutException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedByInterruptException;
import java.nio.channels.SocketChannel;
import java.util.concurrent.TimeUnit;
public class SocketChannelOutputStream extends OutputStream {
private static final long CHANNEL_FULL_WAIT_NANOS = TimeUnit.NANOSECONDS.convert(10, TimeUnit.MILLISECONDS);
private final SocketChannel channel;
private volatile int timeout = 30000;
private final ByteBuffer oneByteBuffer = ByteBuffer.allocate(1);
public SocketChannelOutputStream(final SocketChannel socketChannel) throws IOException {
// this class expects a non-blocking channel
socketChannel.configureBlocking(false);
this.channel = socketChannel;
}
public void setTimeout(final int timeoutMillis) {
this.timeout = timeoutMillis;
}
@Override
public void write(final int b) throws IOException {
oneByteBuffer.flip();
oneByteBuffer.clear();
oneByteBuffer.put((byte) b);
oneByteBuffer.flip();
final int timeoutMillis = this.timeout;
long maxTime = System.currentTimeMillis() + timeoutMillis;
int bytesWritten;
while (oneByteBuffer.hasRemaining()) {
bytesWritten = channel.write(oneByteBuffer);
if (bytesWritten == 0) {
if (System.currentTimeMillis() > maxTime) {
throw new SocketTimeoutException("Timed out writing to socket");
}
try {
TimeUnit.NANOSECONDS.sleep(CHANNEL_FULL_WAIT_NANOS);
} catch (InterruptedException e) {
close();
Thread.currentThread().interrupt(); // set the interrupt status
throw new ClosedByInterruptException(); // simulate an interrupted blocked write operation
}
} else {
return;
}
}
}
@Override
public void write(final byte[] b) throws IOException {
write(b, 0, b.length);
}
@Override
public void write(final byte[] b, final int off, final int len) throws IOException {
final ByteBuffer buffer = ByteBuffer.wrap(b, off, len);
final int timeoutMillis = this.timeout;
long maxTime = System.currentTimeMillis() + timeoutMillis;
int bytesWritten;
while (buffer.hasRemaining()) {
bytesWritten = channel.write(buffer);
if (bytesWritten == 0) {
if (System.currentTimeMillis() > maxTime) {
throw new SocketTimeoutException("Timed out writing to socket");
}
try {
TimeUnit.NANOSECONDS.sleep(CHANNEL_FULL_WAIT_NANOS);
} catch (InterruptedException e) {
close();
Thread.currentThread().interrupt(); // set the interrupt status
throw new ClosedByInterruptException(); // simulate an interrupted blocked write operation
}
} else {
maxTime = System.currentTimeMillis() + timeoutMillis;
}
}
}
/**
* Closes the underlying SocketChannel
*
* @throws java.io.IOException if issues closing underlying stream
*/
@Override
public void close() throws IOException {
channel.close();
}
}