/**
* Create a client transaction from a raw channel.
*
* @param transaction is the transport channel to encapsulate.
*/
public MessageChannel createMessageChannel(SIPTransaction transaction) {
synchronized (clientTransactions) {
// New client transaction to return
SIPTransaction returnChannel = createClientTransaction(transaction.getMessageChannel());
clientTransactions.add(0, (SIPClientTransaction) returnChannel);
((SIPClientTransaction) returnChannel).setViaPort(transaction.getViaPort());
((SIPClientTransaction) returnChannel).setViaHost(transaction.getViaHost());
// Add the transaction timer for the state machine.
returnChannel.startTransactionTimer();
return returnChannel;
}
}
/**
* Handles a new SIP response. It finds a client transaction to handle this message. If none
* exists, it sends the message directly to the superclass.
*
* @param responseReceived Response to handle.
* @param responseMessageChannel Channel that received message.
* @return A client transaction.
*/
protected ServerResponseInterface newSIPServerResponse(
SIPResponse responseReceived, MessageChannel responseMessageChannel) {
// System.out.println("response = " + responseReceived.encode());
// Iterator through all client transactions
Iterator<SIPClientTransaction> transactionIterator;
// Next transaction in the set
SIPClientTransaction nextTransaction;
// Transaction to handle this request
SIPClientTransaction currentTransaction;
String key = responseReceived.getTransactionId();
currentTransaction = (SIPClientTransaction) clientTransactionTable.get(key);
if (currentTransaction == null
|| !currentTransaction.isMessagePartOfTransaction(responseReceived)) {
// Loop through all server transactions
synchronized (clientTransactions) {
transactionIterator = clientTransactions.iterator();
currentTransaction = null;
while (transactionIterator.hasNext() && currentTransaction == null) {
nextTransaction = (SIPClientTransaction) transactionIterator.next();
// If this transaction should handle this request,
if (nextTransaction.isMessagePartOfTransaction(responseReceived)) {
// Mark this transaction as the one to
// handle this message
currentTransaction = nextTransaction;
}
}
}
// If no transaction exists to handle this message,
if (currentTransaction == null) {
// Pass the message directly to the TU
return super.newSIPServerResponse(responseReceived, responseMessageChannel);
}
}
// Set ths transaction's encapsulated response interface
// from the superclass
currentTransaction.setResponseInterface(
super.newSIPServerResponse(responseReceived, currentTransaction));
return currentTransaction;
}
/**
* Find the transaction corresponding to a given request.
*
* @param sipMessage request for which to retrieve the transaction.
* @param isServer search the server transaction table if true.
* @return the transaction object corresponding to the request or null if no such mapping exists.
*/
public SIPTransaction findTransaction(SIPMessage sipMessage, boolean isServer) {
SIPTransaction retval = null;
if (isServer) {
Via via = sipMessage.getTopmostVia();
if (via.getBranch() != null) {
String key = sipMessage.getTransactionId();
synchronized (this.serverTransactionTable) {
retval = (SIPTransaction) serverTransactionTable.get(key);
if (LogWriter.needsLogging) logMessage("looking for key " + key);
if (retval != null && retval.isMessagePartOfTransaction(sipMessage)) return retval;
}
}
// Need to scan the table for old style transactions (RFC 2543
// style)
synchronized (this.serverTransactions) {
Iterator<SIPServerTransaction> it = serverTransactions.iterator();
while (it.hasNext()) {
SIPServerTransaction sipServerTransaction = (SIPServerTransaction) it.next();
if (sipServerTransaction.isMessagePartOfTransaction(sipMessage))
return sipServerTransaction;
}
}
} else {
Via via = sipMessage.getTopmostVia();
if (via.getBranch() != null) {
String key = sipMessage.getTransactionId();
synchronized (this.clientTransactionTable) {
retval = (SIPTransaction) clientTransactionTable.get(key);
if (retval != null && retval.isMessagePartOfTransaction(sipMessage)) return retval;
}
}
// Need to scan the table for old style transactions (RFC 2543
// style)
synchronized (this.clientTransactions) {
Iterator<SIPClientTransaction> it = clientTransactions.iterator();
while (it.hasNext()) {
SIPClientTransaction clientTransaction = (SIPClientTransaction) it.next();
if (clientTransaction.isMessagePartOfTransaction(sipMessage)) return clientTransaction;
}
}
}
return null;
}
/**
* Add a new client transaction to the set of existing transactions. Add it to the top of the list
* so an incoming response has less work to do in order to find the transaction.
*
* @param clientTransaction -- client transaction to add to the set.
*/
public void addTransaction(SIPClientTransaction clientTransaction) {
if (LogWriter.needsLogging) logWriter.logMessage("added transaction " + clientTransaction);
synchronized (clientTransactions) {
clientTransactions.add(0, clientTransaction);
}
addTransactionHash(clientTransaction);
clientTransaction.startTransactionTimer();
}
/**
* Get the transaction to cancel. Search the server transaction table for a transaction that
* matches the given transaction.
*/
public SIPTransaction findCancelTransaction(SIPRequest cancelRequest, boolean isServer) {
if (LogWriter.needsLogging) {
logWriter.logMessage(
"findCancelTransaction request= \n"
+ cancelRequest
+ "\nfindCancelRequest isServer="
+ isServer);
}
if (isServer) {
synchronized (this.serverTransactions) {
Iterator<SIPServerTransaction> li = this.serverTransactions.iterator();
while (li.hasNext()) {
SIPTransaction transaction = (SIPTransaction) li.next();
// SIPRequest sipRequest = (SIPRequest) (transaction
// .getRequest());
SIPServerTransaction sipServerTransaction = (SIPServerTransaction) transaction;
if (sipServerTransaction.doesCancelMatchTransaction(cancelRequest))
return sipServerTransaction;
}
}
} else {
synchronized (this.clientTransactions) {
Iterator<SIPClientTransaction> li = this.clientTransactions.iterator();
while (li.hasNext()) {
SIPTransaction transaction = (SIPTransaction) li.next();
// SIPRequest sipRequest = (SIPRequest) (transaction
// .getRequest());
SIPClientTransaction sipClientTransaction = (SIPClientTransaction) transaction;
if (sipClientTransaction.doesCancelMatchTransaction(cancelRequest))
return sipClientTransaction;
}
}
}
if (LogWriter.needsLogging)
logWriter.logMessage("Could not find transaction for cancel request");
return null;
}
/**
* Creates a client transaction to handle a new request. Gets the real message channel from the
* superclass, and then creates a new client transaction wrapped around this channel.
*
* @param nextHop Hop to create a channel to contact.
*/
public MessageChannel createMessageChannel(int sourcePort, Hop nextHop)
throws UnknownHostException {
synchronized (clientTransactions) {
// New client transaction to return
SIPTransaction returnChannel;
// Create a new client transaction around the
// superclass' message channel
MessageChannel mc = super.createMessageChannel(sourcePort, nextHop);
// Superclass will return null if no message processor
// available for the transport.
if (mc == null) return null;
returnChannel = createClientTransaction(mc);
clientTransactions.add(0, (SIPClientTransaction) returnChannel);
((SIPClientTransaction) returnChannel).setViaPort(nextHop.getPort());
((SIPClientTransaction) returnChannel).setViaHost(nextHop.getHost());
// Add the transaction timer for the state machine.
returnChannel.startTransactionTimer();
return returnChannel;
}
}