org.wildfly.httpclient.common.WildflyClientInputStream Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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
*
* 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.wildfly.httpclient.common;
import static org.xnio.Bits.allAreClear;
import static org.xnio.Bits.anyAreSet;
import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import org.wildfly.common.Assert;
import org.xnio.ChannelListener;
import org.xnio.IoUtils;
import org.xnio.channels.StreamSourceChannel;
import io.undertow.connector.ByteBufferPool;
import io.undertow.connector.PooledByteBuffer;
class WildflyClientInputStream extends InputStream {
private final Object lock = new Object();
private final ByteBufferPool bufferPool;
private final StreamSourceChannel channel;
private PooledByteBuffer pooledByteBuffer;
private IOException ioException;
private int state;
private static final int FLAG_CLOSED = 1;
private static final int FLAG_MINUS_ONE_READ = 1 << 2;
private final ChannelListener channelListener = new ChannelListener() {
@Override
public void handleEvent(StreamSourceChannel streamSourceChannel) {
synchronized (lock) {
if (pooledByteBuffer != null) {
return;
}
boolean free = true;
final PooledByteBuffer pooled = bufferPool.allocate();
try {
for (; ; ) {
int res = streamSourceChannel.read(pooled.getBuffer());
if (res == 0) {
pooled.getBuffer().flip();
if (pooled.getBuffer().hasRemaining()) {
pooledByteBuffer = pooled;
free = false;
streamSourceChannel.suspendReads();
}
lock.notifyAll();
return;
}
if (res == -1) {
pooled.getBuffer().flip();
if (pooled.getBuffer().hasRemaining()) {
pooledByteBuffer = pooled;
free = false;
streamSourceChannel.suspendReads();
}
state |= FLAG_MINUS_ONE_READ;
lock.notifyAll();
return;
} else if (!pooled.getBuffer().hasRemaining()) {
pooled.getBuffer().flip();
pooledByteBuffer = pooled;
free = false;
lock.notifyAll();
streamSourceChannel.suspendReads();
return;
}
}
} catch (IOException e) {
ioException = e;
if (pooledByteBuffer != null) {
pooledByteBuffer.close();
pooledByteBuffer = null;
}
lock.notifyAll();
} finally {
if (free) {
pooled.close();
}
}
}
}
};
WildflyClientInputStream(ByteBufferPool bufferPool, StreamSourceChannel channel) {
this.bufferPool = bufferPool;
this.channel = channel;
}
@Override
public int read() throws IOException {
byte[] b = new byte[1];
int res = read(b);
if (res == 1) {
return b[0] & 0xFF;
}
return res;
}
@Override
public int read(byte[] b) throws IOException {
return read(b, 0, b.length);
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
synchronized (lock) {
if (len < 1) {
return 0;
}
if (Thread.currentThread() == channel.getIoThread()) {
throw HttpClientMessages.MESSAGES.blockingIoFromIOThread();
}
if (anyAreSet(state, FLAG_CLOSED) && !anyAreSet(state, FLAG_MINUS_ONE_READ)) {
throw HttpClientMessages.MESSAGES.streamIsClosed();
}
if (ioException != null) {
throw new IOException(ioException);
}
while (pooledByteBuffer == null) {
if (anyAreSet(state, FLAG_MINUS_ONE_READ)) {
state |= FLAG_CLOSED;
return -1;
}
runReadTask();
try {
lock.wait();
} catch (InterruptedException e) {
throw new InterruptedIOException(e.getMessage());
}
if (ioException != null) {
throw new IOException(ioException);
}
}
int toRead = Math.min(pooledByteBuffer.getBuffer().remaining(), len);
pooledByteBuffer.getBuffer().get(b, off, toRead);
if (!pooledByteBuffer.getBuffer().hasRemaining()) {
pooledByteBuffer.close();
pooledByteBuffer = null;
}
return toRead;
}
}
private void runReadTask() {
Assert.assertTrue(pooledByteBuffer == null);
channel.getReadSetter().set(channelListener);
channel.resumeReads();
}
@Override
public int available() throws IOException {
synchronized (lock) {
if (pooledByteBuffer != null) {
return pooledByteBuffer.getBuffer().remaining();
}
}
return 0;
}
@Override
public void close() throws IOException {
if (anyAreSet(state, FLAG_CLOSED)) {
return;
}
synchronized (lock) {
IoUtils.safeClose(pooledByteBuffer);
pooledByteBuffer = null;
while (allAreClear(state, FLAG_MINUS_ONE_READ) && ioException == null) {
runReadTask();
try {
lock.wait();
} catch (InterruptedException e) {
IoUtils.safeClose(pooledByteBuffer, channel);
throw new InterruptedIOException(e.getMessage());
}
IoUtils.safeClose(pooledByteBuffer);
pooledByteBuffer = null;
}
if (ioException != null) {
throw new IOException(ioException);
}
}
}
}