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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.nio.ByteBuffer;
import java.util.ArrayDeque;
import java.util.Queue;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import org.jboss.logging.Logger;
import org.jboss.remoting3.RemotingOptions;
import org.jboss.remoting3.spi.ConnectionHandlerFactory;
import org.xnio.Buffers;
import org.xnio.ChannelListener;
import org.xnio.IoUtils;
import org.xnio.OptionMap;
import org.xnio.Pool;
import org.xnio.Pooled;
import org.xnio.Result;
import org.xnio.XnioExecutor;
import org.xnio.channels.ConnectedMessageChannel;
import org.xnio.channels.ConnectedStreamChannel;
import org.xnio.channels.SslChannel;
import org.xnio.sasl.SaslWrapper;
/**
* @author David M. Lloyd
*/
final class RemoteConnection {
private static final String FQCN = RemoteConnection.class.getName();
private final Pool messageBufferPool;
private final ConnectedMessageChannel channel;
private final ConnectedStreamChannel underlyingChannel;
private final OptionMap optionMap;
private final RemoteWriteListener writeListener = new RemoteWriteListener();
private final Executor executor;
private final int heartbeatInterval;
private volatile Result result;
private volatile SaslWrapper saslWrapper;
private final RemoteConnectionProvider remoteConnectionProvider;
RemoteConnection(final Pool messageBufferPool, final ConnectedStreamChannel underlyingChannel, final ConnectedMessageChannel channel, final OptionMap optionMap, final RemoteConnectionProvider remoteConnectionProvider) {
this.messageBufferPool = messageBufferPool;
this.underlyingChannel = underlyingChannel;
this.channel = channel;
this.optionMap = optionMap;
heartbeatInterval = optionMap.get(RemotingOptions.HEARTBEAT_INTERVAL, RemotingOptions.DEFAULT_HEARTBEAT_INTERVAL);
this.executor = remoteConnectionProvider.getExecutor();
this.remoteConnectionProvider = remoteConnectionProvider;
}
Pooled allocate() {
return messageBufferPool.allocate();
}
void setReadListener(ChannelListener listener, final boolean resume) {
RemoteLogger.log.logf(RemoteConnection.class.getName(), Logger.Level.TRACE, null, "Setting read listener to %s", listener);
synchronized (getLock()) {
channel.getReadSetter().set(listener);
if (listener != null && resume) {
channel.resumeReads();
}
}
}
RemoteConnectionProvider getRemoteConnectionProvider() {
return remoteConnectionProvider;
}
Result getResult() {
return result;
}
void setResult(final Result result) {
this.result = result;
}
void handleException(IOException e) {
handleException(e, true);
}
void handleException(IOException e, boolean log) {
RemoteLogger.conn.logf(RemoteConnection.class.getName(), Logger.Level.TRACE, e, "Connection error detail");
if (log) {
RemoteLogger.conn.connectionError(e);
}
final XnioExecutor.Key key = writeListener.heartKey;
if (key != null) {
key.remove();
}
IoUtils.safeClose(channel);
final Result result = this.result;
if (result != null) {
result.setException(e);
this.result = null;
}
}
void send(final Pooled pooled) {
writeListener.send(pooled, false);
}
void send(final Pooled pooled, boolean close) {
writeListener.send(pooled, close);
}
void shutdownWrites() {
writeListener.shutdownWrites();
}
OptionMap getOptionMap() {
return optionMap;
}
ConnectedMessageChannel getChannel() {
return channel;
}
ChannelListener getWriteListener() {
return writeListener;
}
public Executor getExecutor() {
return executor;
}
public SslChannel getSslChannel() {
return underlyingChannel instanceof SslChannel ? (SslChannel) underlyingChannel : null;
}
SaslWrapper getSaslWrapper() {
return saslWrapper;
}
void setSaslWrapper(final SaslWrapper saslWrapper) {
this.saslWrapper = saslWrapper;
}
void handlePreAuthCloseRequest() {
try {
terminateHeartbeat();
channel.close();
} catch (IOException e) {
RemoteLogger.conn.debug("Error closing remoting channel", e);
}
}
void sendAlive() {
final Pooled pooled = allocate();
boolean ok = false;
try {
final ByteBuffer buffer = pooled.getResource();
buffer.put(Protocol.CONNECTION_ALIVE);
buffer.limit(80);
Buffers.addRandom(buffer);
buffer.flip();
send(pooled);
ok = true;
channel.wakeupReads();
} finally {
if (! ok) pooled.free();
}
}
void sendAliveResponse() {
final Pooled pooled = allocate();
boolean ok = false;
try {
final ByteBuffer buffer = pooled.getResource();
buffer.put(Protocol.CONNECTION_ALIVE_ACK);
buffer.limit(80);
Buffers.addRandom(buffer);
buffer.flip();
send(pooled);
ok = true;
} finally {
if (! ok) pooled.free();
}
}
void terminateHeartbeat() {
final XnioExecutor.Key key = writeListener.heartKey;
if (key != null) {
key.remove();
}
}
Object getLock() {
return writeListener.queue;
}
final class RemoteWriteListener implements ChannelListener {
private final Queue> queue = new ArrayDeque>();
private XnioExecutor.Key heartKey;
private boolean closed;
RemoteWriteListener() {
}
public void handleEvent(final ConnectedMessageChannel channel) {
synchronized (queue) {
assert channel == getChannel();
Pooled pooled;
final Queue> queue = this.queue;
try {
while ((pooled = queue.peek()) != null) {
final ByteBuffer buffer = pooled.getResource();
if (channel.send(buffer)) {
RemoteLogger.conn.logf(FQCN, Logger.Level.TRACE, null, "Sent message %s (via queue)", buffer);
queue.poll().free();
} else {
// try again later
return;
}
}
if (channel.flush()) {
RemoteLogger.conn.logf(FQCN, Logger.Level.TRACE, null, "Flushed channel");
if (closed) {
terminateHeartbeat();
// End of queue reached; shut down and try to flush the remainder
channel.shutdownWrites();
if (channel.flush()) {
RemoteLogger.conn.logf(FQCN, Logger.Level.TRACE, null, "Shut down writes on channel");
return;
}
// either this is successful and no more notifications will come, or not and it will be retried
// either way we're done here
return;
}
channel.suspendWrites();
}
} catch (IOException e) {
handleException(e, false);
channel.wakeupReads();
while ((pooled = queue.poll()) != null) {
pooled.free();
}
}
// else try again later
}
}
public void shutdownWrites() {
synchronized (queue) {
closed = true;
terminateHeartbeat();
final ConnectedMessageChannel channel = getChannel();
try {
if (! queue.isEmpty()) {
channel.resumeWrites();
return;
}
channel.shutdownWrites();
if (! channel.flush()) {
channel.resumeWrites();
return;
}
RemoteLogger.conn.logf(FQCN, Logger.Level.TRACE, null, "Shut down writes on channel");
} catch (IOException e) {
handleException(e, false);
channel.wakeupReads();
Pooled unqueued;
while ((unqueued = queue.poll()) != null) {
unqueued.free();
}
}
}
}
public void send(Pooled pooled, final boolean close) {
synchronized (queue) {
XnioExecutor.Key heartKey = this.heartKey;
if (heartKey != null) heartKey.remove();
if (closed) { pooled.free(); return; }
if (close) { closed = true; }
final ConnectedMessageChannel channel = getChannel();
boolean free = true;
try {
final SaslWrapper wrapper = saslWrapper;
if (wrapper != null) {
final ByteBuffer buffer = pooled.getResource();
final ByteBuffer source = buffer.duplicate();
buffer.clear();
wrapper.wrap(buffer, source);
buffer.flip();
}
if (queue.isEmpty()) {
final ByteBuffer buffer = pooled.getResource();
if (! channel.send(buffer)) {
RemoteLogger.conn.logf(FQCN, Logger.Level.TRACE, null, "Can't directly send message %s, enqueued", buffer);
queue.add(pooled);
free = false;
channel.resumeWrites();
return;
}
RemoteLogger.conn.logf(FQCN, Logger.Level.TRACE, null, "Sent message %s (direct)", buffer);
if (close) {
channel.shutdownWrites();
RemoteLogger.conn.logf(FQCN, Logger.Level.TRACE, null, "Shut down writes on channel (direct)");
// fall thru to flush
}
if (! channel.flush()) {
channel.resumeWrites();
return;
}
RemoteLogger.conn.logf(FQCN, Logger.Level.TRACE, null, "Flushed channel (direct)");
if (! close) {
this.heartKey = channel.getWriteThread().executeAfter(heartbeatCommand, heartbeatInterval, TimeUnit.MILLISECONDS);
}
} else {
queue.add(pooled);
free = false;
}
} catch (IOException e) {
handleException(e, false);
channel.wakeupReads();
Pooled unqueued;
while ((unqueued = queue.poll()) != null) {
unqueued.free();
}
} finally {
if (free) {
pooled.free();
}
}
}
}
}
private final Runnable heartbeatCommand = new Runnable() {
public void run() {
sendAlive();
}
};
public String toString() {
return String.format("Remoting connection %08x to %s", Integer.valueOf(hashCode()), channel.getPeerAddress());
}
}
