/*
* TeleStax, Open Source Cloud Communications
* Copyright 2011-2016, TeleStax Inc. and individual contributors
* by the @authors tag.
*
* This program is free software: you can redistribute it and/or modify
* under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
package org.jdiameter.client.impl.transport.tcp.netty;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.concurrent.ConcurrentLinkedQueue;
// FIXME : requires JDK6 : import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.jdiameter.api.AvpDataException;
import org.jdiameter.api.Configuration;
import org.jdiameter.api.InternalException;
import org.jdiameter.api.OverloadException;
import org.jdiameter.client.api.IMessage;
import org.jdiameter.client.api.io.IConnection;
import org.jdiameter.client.api.io.IConnectionListener;
import org.jdiameter.client.api.io.TransportError;
import org.jdiameter.client.api.io.TransportException;
import org.jdiameter.client.api.parser.IMessageParser;
import org.jdiameter.common.api.concurrent.IConcurrentFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.netty.channel.Channel;
/**
*
* @author <a href="mailto:jqayyum@gmail.com"> Jehanzeb Qayyum </a>
*/
public class TCPClientConnection implements IConnection {
private static Logger logger = LoggerFactory.getLogger(TCPClientConnection.class);
private final long createdTime = System.currentTimeMillis();
private TCPTransportClient client;
// FIXME : requires JDK6 : protected LinkedBlockingDeque<Event> buffer = new
// LinkedBlockingDeque<Event>(64);
private LinkedBlockingQueue<Event> buffer = new LinkedBlockingQueue<Event>(64);
private IMessageParser parser;
private Lock lock = new ReentrantLock();
private ConcurrentLinkedQueue<IConnectionListener> listeners = new ConcurrentLinkedQueue<IConnectionListener>();
// Cached value for connection key
private String cachedKey = null;
public TCPClientConnection(Configuration config, IConcurrentFactory concurrentFactory, InetAddress remoteAddress,
int remotePort, InetAddress localAddress, int localPort, IMessageParser parser, String ref) {
this.parser = parser;
this.client = new TCPTransportClient(this, parser, new InetSocketAddress(remoteAddress, remotePort),
new InetSocketAddress(localAddress, localPort));
}
public TCPClientConnection(Configuration config, IConcurrentFactory concurrentFactory, InetAddress remoteAddress,
int remotePort, InetAddress localAddress, int localPort, IConnectionListener listener, IMessageParser parser,
String ref) {
this(config, concurrentFactory, remoteAddress, remotePort, localAddress, localPort, parser, ref);
listeners.add(listener);
}
public TCPClientConnection(Channel channel, IMessageParser parser) {
this.parser = parser;
this.client = new TCPTransportClient(this, parser, channel);
}
public long getCreatedTime() {
return createdTime;
}
public void connect() throws TransportException {
try {
this.client.start();
} catch (Exception e) {
throw new TransportException("Cannot init transport: ", TransportError.Internal, e);
}
}
public void disconnect() throws InternalError {
logger.debug("In disconnect for [{}]", this.getKey());
try {
if (this.client != null) {
this.client.stop();
}
} catch (Exception e) {
throw new InternalError("Error while stopping transport: " + e.getMessage());
}
}
public void release() throws IOException {
logger.debug("In release for [{}]", this.getKey());
try {
if (this.client != null) {
this.client.release();
}
} catch (Exception e) {
throw new IOException(e.getMessage());
} finally {
parser = null;
buffer.clear();
remAllConnectionListener();
}
}
public void sendMessage(IMessage message) throws TransportException, OverloadException {
try {
if (this.client != null) {
this.client.sendMessage(message);
}
} catch (Exception e) {
throw new TransportException("Cannot send message: ", TransportError.FailedSendMessage, e);
}
}
protected TCPTransportClient getClient() {
return this.client;
}
public boolean isNetworkInitiated() {
return false;
}
public boolean isConnected() {
return this.client != null && this.client.isConnected();
}
public InetAddress getRemoteAddress() {
return this.client.getDestAddress().getAddress();
}
public int getRemotePort() {
return this.client.getDestAddress().getPort();
}
public void addConnectionListener(IConnectionListener listener) {
lock.lock();
try {
listeners.add(listener);
if (buffer.size() != 0) {
for (Event e : buffer) {
try {
logger.debug("Processing event from buffer");
onEvent(e);
} catch (AvpDataException e1) {
// ignore
}
}
buffer.clear();
}
} finally {
lock.unlock();
}
}
public void remAllConnectionListener() {
logger.debug("Waiting to get lock in order to remove all listeners");
lock.lock();
try {
logger.debug("Removing all listeners on [{}]", this.getKey());
listeners.clear();
} finally {
lock.unlock();
}
}
public void remConnectionListener(IConnectionListener listener) {
lock.lock();
try {
logger.debug("Removing listener [{}] on [{}]", listener.getClass().getName(), this.getKey());
listeners.remove(listener);
} finally {
lock.unlock();
}
}
public boolean isWrapperFor(Class<?> aClass) throws InternalException {
return false;
}
public <T> T unwrap(Class<T> aClass) throws InternalException {
return null;
}
public String getKey() {
if (this.cachedKey == null) {
this.cachedKey = new StringBuffer("aaa://").append(getRemoteAddress().getHostName()).append(":").append(getRemotePort())
.toString();
}
return this.cachedKey;
}
protected void onDisconnect() throws AvpDataException {
onEvent(new Event(EventType.DISCONNECTED));
}
protected void onMessageReceived(IMessage message) throws AvpDataException {
onEvent(new Event(EventType.MESSAGE_RECEIVED, message));
}
protected void onAvpDataException(AvpDataException e) {
try {
onEvent(new Event(EventType.DATA_EXCEPTION, e));
} catch (AvpDataException e1) {
// ignore
}
}
protected void onConnected() {
try {
onEvent(new Event(EventType.CONNECTED));
} catch (AvpDataException e1) {
// ignore
}
}
protected void onEvent(Event event) throws AvpDataException {
logger.debug("In onEvent for connection [{}]. Getting lock", this.getKey());
lock.lock();
logger.debug("Got lock");
try {
if (processBufferedMessages(event)) {
for (IConnectionListener listener : listeners) {
if (logger.isDebugEnabled()) {
logger.debug("Passing event to listener. Event type is [{}]", event.type.toString());
}
switch (event.type) {
case CONNECTED:
listener.connectionOpened(getKey());
break;
case DISCONNECTED:
listener.connectionClosed(getKey(), null);
break;
case MESSAGE_RECEIVED:
listener.messageReceived(getKey(), event.message);
break;
case DATA_EXCEPTION:
listener.internalError(getKey(), null,
new TransportException("Avp Data Exception:", TransportError.ReceivedBrokenMessage, event.exception));
break;
}
}
}
} finally {
logger.debug("Releasing lock and finished onEvent for connection [{}]", this.getKey());
lock.unlock();
}
}
protected boolean processBufferedMessages(Event event) throws AvpDataException {
if (listeners.size() == 0) {
logger.debug("listeners.size() == 0 on connection [{}]", this.getKey());
try {
buffer.add(event);
} catch (IllegalStateException e) {
logger.debug("Got IllegalStateException in processBufferedMessages");
// FIXME : requires JDK6 : buffer.removeLast();
Event[] tempBuffer = buffer.toArray(new Event[buffer.size()]);
buffer.remove(tempBuffer[tempBuffer.length - 1]);
buffer.add(event);
}
logger.debug("processBufferedMessages is returning false");
return false;
} else {
logger.debug("processBufferedMessages is returning true on connection [{}] as there are listeners", getKey());
return true;
}
}
// ------------------ helper classes ------------------------
private enum EventType {
CONNECTED, DISCONNECTED, MESSAGE_RECEIVED, DATA_EXCEPTION
}
private static class Event {
EventType type;
IMessage message;
Exception exception;
Event(EventType type) {
this.type = type;
}
Event(EventType type, Exception exception) {
this(type);
this.exception = exception;
}
Event(EventType type, IMessage message) {
this(type);
this.message = message;
}
}
}