/**
* a DatagramChannel has data ready - process all the pending packets, whether its for a
* rdpserversocket or rdpconnection.
*/
void processActiveChannel(DatagramChannel dc) throws ClosedChannelException {
RDPPacket packet;
int count = 0;
// read in the packet
try {
Set<RDPConnection> needsAckConnections = new HashSet<RDPConnection>();
while ((packet = RDPServer.receivePacket(dc)) != null) {
if (Log.loggingNet)
Log.net(
"RDPServer.processActiveChannel: Starting iteration with count of "
+ count
+ " packets");
// see if there is a connection already for this packet
InetAddress remoteAddr = packet.getInetAddress();
int remotePort = packet.getPort();
int localPort = dc.socket().getLocalPort();
ConnectionInfo conInfo = new ConnectionInfo(remoteAddr, remotePort, localPort);
RDPConnection con = RDPServer.getConnection(dc, conInfo);
if (con != null) {
if (Log.loggingNet)
Log.net("RDPServer.processActiveChannel: found an existing connection: " + con);
count++;
if (processExistingConnection(con, packet)) needsAckConnections.add(con);
// Prevent this from blocking getActiveChannels by
// putting an upper bound on the number of packets
// processed
if (count >= 20) break;
continue;
} else {
Log.net("RDPServer.processActiveChannel: did not find an existing connection");
}
// there is no connection,
// see if there is a socket listening for new connection
RDPServerSocket rdpSocket = RDPServer.getRDPSocket(dc);
if (rdpSocket != null) {
count++;
processNewConnection(rdpSocket, packet);
return;
}
return;
}
// Finally, send out the acks
for (RDPConnection con : needsAckConnections) {
RDPPacket replyPacket = new RDPPacket(con);
con.sendPacketImmediate(replyPacket, false);
}
} catch (ClosedChannelException ex) {
Log.error("RDPServer.processActiveChannel: ClosedChannel " + dc.socket());
throw ex;
} finally {
if (Log.loggingNet)
Log.net("RDPServer.processActiveChannel: Returning after processing " + count + " packets");
}
}
static Set<RDPConnection> getAllConnections() {
lock.lock();
try {
Set<RDPConnection> allCon = new HashSet<RDPConnection>();
Iterator<Map<ConnectionInfo, RDPConnection>> iter = allConMap.values().iterator();
while (iter.hasNext()) {
Map<ConnectionInfo, RDPConnection> dcMap = iter.next();
allCon.addAll(dcMap.values());
}
return allCon;
} finally {
lock.unlock();
}
}
/** starts the server listens to incoming packets */
public void run() {
try {
while (true) {
if (Log.loggingNet) Log.net("In RDPServer.run: starting new iteration");
try {
Set<DatagramChannel> activeChannels = getActiveChannels();
activeChannelCalls++;
Iterator<DatagramChannel> iter = activeChannels.iterator();
while (iter.hasNext()) {
DatagramChannel dc = iter.next();
if (Log.loggingNet) Log.net("In RDPServer.run: about to call processActiveChannel");
processActiveChannel(dc);
if (Log.loggingNet) Log.net("In RDPServer.run: returned from processActiveChannel");
}
} catch (ClosedChannelException ex) {
// ignore
} catch (Exception e) {
Log.exception("RDPServer.run caught exception", e);
}
}
} finally {
Log.warn("RDPServer.run: thread exiting");
}
}
/** returns a list of rdpserversockets */
Set<DatagramChannel> getActiveChannels() throws InterruptedException, java.io.IOException {
lock.lock();
try {
while (channelMap.isEmpty()) {
channelMapNotEmpty.await();
}
} finally {
lock.unlock();
}
Set<SelectionKey> readyKeys = null;
do {
lock.lock();
try {
if (!newChannelSet.isEmpty()) {
if (Log.loggingNet) Log.net("RDPServer.getActiveChannels: newChannelSet is not null");
Iterator<DatagramChannel> iter = newChannelSet.iterator();
while (iter.hasNext()) {
DatagramChannel newDC = iter.next();
iter.remove();
newDC.register(selector, SelectionKey.OP_READ);
}
}
} finally {
lock.unlock();
}
int numReady = selector.select(); // this is a blocking call - thread safe
selectCalls++;
if (numReady == 0) {
if (Log.loggingNet) Log.net("RDPServer.getActiveChannels: selector returned 0");
continue;
}
readyKeys = selector.selectedKeys();
if (Log.loggingNet)
Log.net(
"RDPServer.getActiveChannels: called select - # of ready keys = "
+ readyKeys.size()
+ " == "
+ numReady);
} while (readyKeys == null || readyKeys.isEmpty());
lock.lock();
try {
// get a datagramchannel that is ready
Set<DatagramChannel> activeChannels = new HashSet<DatagramChannel>();
Iterator<SelectionKey> iter = readyKeys.iterator();
while (iter.hasNext()) {
SelectionKey key = iter.next();
if (Log.loggingNet)
Log.net(
"RDPServer.getActiveChannels: matched selectionkey: "
+ key
+ ", isAcceptable="
+ key.isAcceptable()
+ ", isReadable="
+ key.isReadable()
+ ", isValid="
+ key.isValid()
+ ", isWritable="
+ key.isWritable());
iter.remove(); // remove from the selected key list
if (!key.isReadable() || !key.isValid()) {
Log.error(
"RDPServer.getActiveChannels: Throwing exception: RDPServer: not readable or invalid");
throw new MVRuntimeException("RDPServer: not readable or invalid");
}
DatagramChannel dc = (DatagramChannel) key.channel();
activeChannels.add(dc);
}
if (Log.loggingNet)
Log.net(
"RDPServer.getActiveChannels: returning " + activeChannels.size() + " active channels");
return activeChannels;
} finally {
lock.unlock();
}
}