// Be kind and assign a via header for this provider if the user is
// sloppy
if (sipRequest.getTopmostVia() == null) {
ListeningPointImpl lp = (ListeningPointImpl) this
.getListeningPoint("udp");
Via via = lp.getViaHeader();
request.setHeader(via);
}
// Give the request a quick check to see if all headers are assigned.
try {
sipRequest.checkHeaders();
} catch (ParseException ex) {
throw new TransactionUnavailableException(ex.getMessage(), ex);
}
/*
* User decided to give us his own via header branch. Lets see if it
* results in a clash. If so reject the request.
*/
if (sipRequest.getTopmostVia().getBranch() != null
&& sipRequest.getTopmostVia().getBranch().startsWith(
SIPConstants.BRANCH_MAGIC_COOKIE)
&& sipStack.findTransaction((SIPRequest) request, false) != null) {
throw new TransactionUnavailableException(
"Transaction already exists!");
}
if (request.getMethod().equalsIgnoreCase(Request.CANCEL)) {
SIPClientTransaction ct = (SIPClientTransaction) sipStack
.findCancelTransaction((SIPRequest) request, false);
if (ct != null) {
ClientTransaction retval = sipStack.createClientTransaction(
(SIPRequest) request, ct.getMessageChannel());
((SIPTransaction) retval).addEventListener(this);
sipStack.addTransaction((SIPClientTransaction) retval);
if (ct.getDialog() != null) {
((SIPClientTransaction) retval).setDialog((SIPDialog) ct
.getDialog(), sipRequest.getDialogId(false));
}
return retval;
}
}
if (sipStack.isLoggingEnabled())
sipStack.getLogWriter().logDebug(
"could not find existing transaction for "
+ ((SIPRequest) request).getFirstLine()
+ " creating a new one ");
// Could not find a dialog or the route is not set in dialog.
Hop hop = null;
try {
hop = sipStack.getNextHop((SIPRequest) request);
if (hop == null)
throw new TransactionUnavailableException(
"Cannot resolve next hop -- transaction unavailable");
} catch (SipException ex) {
throw new TransactionUnavailableException(
"Cannot resolve next hop -- transaction unavailable", ex);
}
String transport = hop.getTransport();
ListeningPointImpl listeningPoint = (ListeningPointImpl) this
.getListeningPoint(transport);
String dialogId = sipRequest.getDialogId(false);
SIPDialog dialog = sipStack.getDialog(dialogId);
if (dialog != null && dialog.getState() == DialogState.TERMINATED) {
// throw new TransactionUnavailableException
// ("Found a terminated dialog -- possible re-use of old tag
// parameters");
sipStack.removeDialog(dialog);
}
// An out of dialog route was found. Assign this to the
// client transaction.
try {
// Set the brannch id before you ask for a tx.
// If the user has set his own branch Id and the
// branch id starts with a valid prefix, then take it.
// otherwise, generate one.
String branchId = null;
if (sipRequest.getTopmostVia().getBranch() == null
|| !sipRequest.getTopmostVia().getBranch().startsWith(
SIPConstants.BRANCH_MAGIC_COOKIE)) {
branchId = Utils.getInstance().generateBranchId();
sipRequest.getTopmostVia().setBranch(branchId);
}
Via topmostVia = sipRequest.getTopmostVia();
topmostVia.setTransport(transport);
topmostVia.setPort(listeningPoint.getPort());
branchId = sipRequest.getTopmostVia().getBranch();
SIPClientTransaction ct = (SIPClientTransaction) sipStack
.createMessageChannel(sipRequest, listeningPoint
.getMessageProcessor(), hop);