package org.commoncrawl.rpc;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.LinkedList;
import org.commoncrawl.async.EventLoop;
import org.commoncrawl.async.Timer;
import org.commoncrawl.io.internal.NIOClientSocket;
import org.commoncrawl.io.internal.NIOClientTCPSocket;
import org.commoncrawl.io.internal.NIOServerSocketListener;
import org.commoncrawl.io.internal.NIOServerTCPSocket;
import org.commoncrawl.io.internal.NIOSocket;
/**
* RPCServerChannel - Listens for and routes RPCMessages on a given
* Socket/Endpoint.
* @author rana
*
*/
public class RPCServerChannel implements NIOServerSocketListener {
public static interface ConnectionCallback {
void IncomingClientConnected(RPCChannel channel);
void IncomingClientDisconnected(RPCChannel channel);
}
private static int INITIAL_RECONNECT_DELAY = 1000;
InetSocketAddress _address;
EventLoop _eventLoop;
NIOServerTCPSocket _socket;
Timer _reconnectTimer = null;
int _reconnectDelay = 0;
RPCActorService _server;
LinkedList<RPCChannel> _activeClients = new LinkedList<RPCChannel>();
ConnectionCallback _callback;
private enum State {
OPEN, OPEN_CONNECTED, CLOSED
}
State _state = State.CLOSED;
public RPCServerChannel(RPCActorService server, EventLoop eventLoop,
InetSocketAddress address, ConnectionCallback callback) {
_address = address;
_eventLoop = eventLoop;
_server = server;
_callback = callback;
}
public void open() throws IOException {
if (_state == State.CLOSED) {
rebind();
}
}
public void close() {
if (_state != State.CLOSED) {
release();
}
}
void rebind() throws IOException {
release();
if (_reconnectDelay == 0) {
_reconnectDelay = INITIAL_RECONNECT_DELAY;
bind();
} else {
_reconnectTimer = new Timer(_reconnectDelay, false,
new Timer.Callback() {
// @Override
public void timerFired(Timer timer) {
try {
bind();
} catch (IOException e) {
e.printStackTrace();
try {
rebind();
} catch (IOException e2) {
}
}
}
});
_eventLoop.setTimer(_reconnectTimer);
}
}
void bind() throws IOException {
// increate reconnect delay ...
_reconnectDelay = _reconnectDelay * 2;
_reconnectTimer = null;
if (_socket == null) {
_socket = new NIOServerTCPSocket(this);
_socket.open(_address);
_eventLoop.getSelector().registerForAccept(_socket);
// update state ...
_state = State.OPEN_CONNECTED;
}
}
void release() {
// stop accepting sockets on this host ...
if (_reconnectTimer != null) {
_eventLoop.cancelTimer(_reconnectTimer);
_reconnectTimer = null;
}
if (_socket != null) {
_eventLoop.getSelector().cancelRegistration(_socket);
_socket.close();
_socket = null;
}
for (RPCChannel client : _activeClients) {
try {
client.close();
} catch (IOException e) {
}
}
_activeClients.clear();
_state = State.CLOSED;
}
RPCActorService getServer() {
return _server;
}
// @Override
public void Accepted(NIOClientSocket newClientSocket) throws IOException {
RPCChannel newChannel = new RPCChannel(
(NIOClientTCPSocket) newClientSocket, this);
_activeClients.add(newChannel);
if (_callback != null) {
_callback.IncomingClientConnected(newChannel);
}
}
// @Override
public void Disconnected(NIOSocket theSocket, Exception disconnectReason)
throws IOException {
}
void ClientChannelDisconnected(RPCChannel channel) {
if (_callback != null)
_callback.IncomingClientDisconnected(channel);
_activeClients.remove(channel);
}
final void dispatchRequest(RPCChannel source,RPCFrame.IncomingFrame frame) throws RPCException {
getServer().dispatchWireRequest(this, source, frame);
}
public void Excepted(NIOSocket socket, Exception e) {
}
}