/**
* 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;
}
/**
* 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;
}
/**
* Handles a new SIP request. It finds a server transaction to handle this message. If none
* exists, it creates a new transaction.
*
* @param requestReceived Request to handle.
* @param requestMessageChannel Channel that received message.
* @return A server transaction.
*/
protected ServerRequestInterface newSIPServerRequest(
SIPRequest requestReceived, MessageChannel requestMessageChannel) {
// Iterator through all server transactions
Iterator<SIPServerTransaction> transactionIterator;
// Next transaction in the set
SIPServerTransaction nextTransaction;
// Transaction to handle this request
SIPServerTransaction currentTransaction;
String key = requestReceived.getTransactionId();
currentTransaction = (SIPServerTransaction) serverTransactionTable.get(key);
if (currentTransaction == null
|| !currentTransaction.isMessagePartOfTransaction(requestReceived)) {
// Loop through all server transactions
synchronized (serverTransactions) {
transactionIterator = serverTransactions.iterator();
currentTransaction = null;
while (transactionIterator.hasNext() && currentTransaction == null) {
nextTransaction = (SIPServerTransaction) transactionIterator.next();
// If this transaction should handle this request,
if (nextTransaction.isMessagePartOfTransaction(requestReceived)) {
// Mark this transaction as the one
// to handle this message
currentTransaction = nextTransaction;
}
}
// If no transaction exists to handle this message
if (currentTransaction == null) {
currentTransaction = findPendingTransaction(requestReceived);
if (currentTransaction != null) return currentTransaction;
currentTransaction = createServerTransaction(requestMessageChannel);
currentTransaction.setOriginalRequest(requestReceived);
if (!isDialogCreated(requestReceived.getMethod())) {
// Dialog is not created - can we find the state?
// If so, then create a transaction and add it.
String dialogId = requestReceived.getDialogId(true);
SIPDialog dialog = getDialog(dialogId);
// Sequence numbers are supposed to increment.
// avoid processing old sequence numbers and
// delivering the same request up to the
// application if the request has already been seen.
// Special handling applies to ACK processing.
if (dialog != null
&& (requestReceived.getMethod().equals(Request.ACK)
|| requestReceived.getCSeq().getSequenceNumber()
> dialog.getRemoteSequenceNumber())) {
// Found a dialog.
if (LogWriter.needsLogging)
logWriter.logMessage("adding server transaction " + currentTransaction);
serverTransactions.add(0, currentTransaction);
addTransactionHash(currentTransaction);
currentTransaction.startTransactionTimer();
currentTransaction.isMapped = true;
}
} else {
// Create the transaction but dont map it.
String dialogId = requestReceived.getDialogId(true);
SIPDialog dialog = getDialog(dialogId);
// This is a dialog creating request that is part of an
// existing dialog (eg. re-Invite). Re-invites get a non
// null server transaction Id (unlike the original
// invite).
if (dialog != null
&& requestReceived.getCSeq().getSequenceNumber()
> dialog.getRemoteSequenceNumber()) {
currentTransaction.map();
if (LogWriter.needsLogging)
logWriter.logMessage("adding server transaction " + currentTransaction);
serverTransactions.add(0, currentTransaction);
addTransactionHash(currentTransaction);
currentTransaction.startTransactionTimer();
currentTransaction.toListener = true;
}
}
}
}
}
// Set ths transaction's encapsulated request
// interface from the superclass
currentTransaction.setRequestInterface(
super.newSIPServerRequest(requestReceived, currentTransaction));
return currentTransaction;
}
/**
* Return the dialog for a given dialog ID. If compatibility is enabled then we do not assume the
* presence of tags and hence need to add a flag to indicate whether this is a server or client
* transaction.
*
* @param dialogId is the dialog id to check.
*/
public SIPDialog getDialog(String dialogId) {
if (LogWriter.needsLogging) logWriter.logMessage("Getting dialog for " + dialogId);
synchronized (dialogTable) {
return (SIPDialog) dialogTable.get(dialogId);
}
}