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/*
* JBoss, Home of Professional Open Source
* Copyright 2011, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.remoting3.remote;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.nio.ByteBuffer;
import org.jboss.remoting3.MessageCancelledException;
import org.jboss.remoting3.MessageOutputStream;
import org.jboss.remoting3.NotOpenException;
import org.xnio.BrokenPipeException;
import org.xnio.IoUtils;
import org.xnio.Pooled;
import org.xnio.channels.ConnectedMessageChannel;
import org.xnio.streams.BufferPipeOutputStream;
import static java.lang.Thread.holdsLock;
import static org.jboss.remoting3.remote.RemoteLogger.log;
/**
* @author David M. Lloyd
*/
final class OutboundMessage extends MessageOutputStream {
final short messageId;
final RemoteConnectionChannel channel;
final BufferPipeOutputStream pipeOutputStream;
final int maximumWindow;
int window;
boolean closeCalled;
boolean closeReceived;
boolean cancelled;
boolean cancelSent;
boolean eofSent;
boolean released;
long remaining;
final BufferPipeOutputStream.BufferWriter bufferWriter = new BufferPipeOutputStream.BufferWriter() {
public Pooled getBuffer(boolean firstBuffer) throws IOException {
Pooled pooled = allocate(Protocol.MESSAGE_DATA);
boolean ok = false;
try {
ByteBuffer buffer = pooled.getResource();
//Reserve room for the transmit data which is 4 bytes
buffer.limit(buffer.limit() - 4);
buffer.put(firstBuffer ? Protocol.MSG_FLAG_NEW : 0); // flags
// header size plus window size
int windowPlusHeader = maximumWindow + 8;
if (buffer.remaining() > windowPlusHeader) {
// never try to write more than the maximum window size
buffer.limit(windowPlusHeader);
}
ok = true;
return pooled;
} finally {
if (! ok) pooled.free();
}
}
public void accept(final Pooled pooledBuffer, final boolean eof) throws IOException {
boolean ok = false;
try {
assert holdsLock(pipeOutputStream);
if (closeCalled) {
throw new NotOpenException("Message was closed asynchronously by another thread");
}
if (cancelSent) {
throw new MessageCancelledException("Message was cancelled");
}
if (closeReceived) {
throw new BrokenPipeException("Remote side closed the message stream");
}
if (eof) {
closeCalled = true;
// make sure other waiters know about it
pipeOutputStream.notifyAll();
}
final ByteBuffer buffer = pooledBuffer.getResource();
final ConnectedMessageChannel messageChannel = channel.getRemoteConnection().getChannel();
final boolean badMsgSize = channel.getConnectionHandler().isFaultyMessageSize();
final int msgSize = badMsgSize ? buffer.remaining() : buffer.remaining() - 8;
boolean sendCancel = cancelled && ! cancelSent;
boolean intr = false;
if (msgSize > 0 && ! sendCancel) {
// empty messages and cancellation both bypass the transmit window check
for (;;) {
if (window >= msgSize) {
window -= msgSize;
if (log.isTraceEnabled()) {
log.tracef("Message window is open (%d-%d=%d remaining), proceeding with send", Integer.valueOf(window + msgSize), Integer.valueOf(msgSize), Integer.valueOf(window));
}
break;
}
try {
log.trace("Message window is closed, waiting");
pipeOutputStream.wait();
} catch (InterruptedException e) {
cancelled = true;
intr = true;
break;
}
if (closeReceived) {
throw new BrokenPipeException("Remote side closed the message stream");
}
if (closeCalled && ! eof) {
throw new NotOpenException("Message was closed asynchronously by another thread");
}
if (cancelSent) {
throw new MessageCancelledException("Message was cancelled");
}
}
}
if (eof || sendCancel || intr) {
// EOF flag (sync close)
eofSent = true;
buffer.put(7, (byte) (buffer.get(7) | Protocol.MSG_FLAG_EOF));
log.tracef("Sending message (with EOF) (%s) to %s", buffer, messageChannel);
if (! channel.getConnectionHandler().isMessageClose()) {
// free now, because we may never receive a close message
channel.free(OutboundMessage.this);
}
if (! released) {
released = true;
channel.closeOutboundMessage();
}
}
if (sendCancel || intr) {
cancelSent = true;
buffer.put(7, (byte) (buffer.get(7) | Protocol.MSG_FLAG_CANCELLED));
buffer.limit(8); // discard everything in the buffer so we can send even if there is no window
log.trace("Message includes cancel flag");
}
channel.getRemoteConnection().send(pooledBuffer);
ok = true;
if (intr) {
Thread.currentThread().interrupt();
throw new InterruptedIOException("Interrupted on write (message cancelled)");
}
} finally {
if (! ok) pooledBuffer.free();
}
}
public void flush() throws IOException {
log.trace("Flushing message channel");
// no op
}
};
static final IntIndexer INDEXER = new IntIndexer() {
public int getKey(final OutboundMessage argument) {
return argument.messageId & 0xffff;
}
public boolean equals(final OutboundMessage argument, final int index) {
return (argument.messageId & 0xffff) == index;
}
};
OutboundMessage(final short messageId, final RemoteConnectionChannel channel, final int window, final long maxOutboundMessageSize) {
this.messageId = messageId;
this.channel = channel;
this.window = maximumWindow = window;
this.remaining = maxOutboundMessageSize;
try {
pipeOutputStream = new BufferPipeOutputStream(bufferWriter);
} catch (IOException e) {
// not possible
throw new IllegalStateException(e);
}
}
Pooled allocate(byte protoId) {
Pooled pooled = channel.allocate(protoId);
ByteBuffer buffer = pooled.getResource();
buffer.putShort(messageId);
return pooled;
}
void acknowledge(int count) {
synchronized (pipeOutputStream) {
if (log.isTraceEnabled()) {
// do trace enabled check because of boxing here
log.tracef("Acknowledged %d bytes on %s", Integer.valueOf(count), this);
}
window += count;
pipeOutputStream.notifyAll();
}
}
void remoteClosed() {
synchronized (pipeOutputStream) {
closeReceived = true;
Pooled pooled = pipeOutputStream.breakPipe();
if (pooled != null) {
pooled.free();
}
if (! eofSent && channel.getConnectionHandler().isMessageClose()) {
eofSent = true;
pooled = allocate(Protocol.MESSAGE_DATA);
boolean ok = false;
try {
final ByteBuffer buffer = pooled.getResource();
buffer.put(Protocol.MSG_FLAG_EOF); // flags
buffer.flip();
channel.getRemoteConnection().send(pooled);
ok = true;
} finally {
if (! ok) pooled.free();
}
}
// safe to free now; remote side has cleared this ID for sure
// if the peer is new, then they send this to free the message either way
// if the peer is old, then they only send this if they're using the broken async close protocol, and they've already dropped the ID
// either way if this was already freed then it's OK as this is idempotent
channel.free(this);
if (! released) {
released = true;
channel.closeOutboundMessage();
}
// wake up waiters
pipeOutputStream.notifyAll();
}
}
public void write(final int b) throws IOException {
if (remaining > 1) {
pipeOutputStream.write(b);
remaining--;
} else {
throw overrun();
}
}
private IOException overrun() {
try {
return new IOException("Maximum message size overrun");
} finally {
cancel();
}
}
public void write(final byte[] b) throws IOException {
write(b, 0, b.length);
}
public void write(final byte[] b, final int off, final int len) throws IOException {
if ((long) len > remaining) {
throw overrun();
}
pipeOutputStream.write(b, off, len);
remaining -= len;
}
public void flush() throws IOException {
pipeOutputStream.flush();
}
public void close() throws IOException {
synchronized (pipeOutputStream) {
pipeOutputStream.notifyAll();
pipeOutputStream.close();
}
}
public MessageOutputStream cancel() {
synchronized (pipeOutputStream) {
cancelled = true;
pipeOutputStream.notifyAll();
IoUtils.safeClose(pipeOutputStream);
return this;
}
}
public String toString() {
return String.format("Outbound message ID %04x on %s", Short.valueOf(messageId), channel);
}
void dumpState(final StringBuilder b) {
b.append(" ").append(String.format("Outbound message ID %04x, window %d of %d\n", Integer.valueOf(messageId & 0xFFFF), Integer.valueOf(window), Integer.valueOf(maximumWindow)));
b.append(" ").append("* flags: ");
if (cancelled) b.append("cancelled ");
if (cancelSent) b.append("cancel-sent ");
if (closeReceived) b.append("close-received ");
if (closeCalled) b.append("closed-called ");
if (eofSent) b.append("eof-sent ");
b.append('\n');
}
}
