public ClientTransaction getNewClientTransaction(Request request)
throws TransactionUnavailableException {
if (request == null)
throw new NullPointerException("null request");
if (!sipStack.isAlive())
throw new TransactionUnavailableException("Stack is stopped");
SIPRequest sipRequest = (SIPRequest) request;
if (sipRequest.getTransaction() != null)
throw new TransactionUnavailableException(
"Transaction already assigned to request");
if ( sipRequest.getMethod().equals(Request.ACK)) {
throw new TransactionUnavailableException ("Cannot create client transaction for " + Request.ACK);
}
// 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.getStackLogger().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. If branch ID checking has
// been requested, set the branch ID.
String branchId = null;
if (sipRequest.getTopmostVia().getBranch() == null
|| !sipRequest.getTopmostVia().getBranch().startsWith(
SIPConstants.BRANCH_MAGIC_COOKIE)
|| sipStack.checkBranchId() ) {
branchId = Utils.getInstance().generateBranchId();
sipRequest.getTopmostVia().setBranch(branchId);
}
Via topmostVia = sipRequest.getTopmostVia();
//set port and transport if user hasn't already done this.
if(topmostVia.getTransport() == null)
topmostVia.setTransport(transport);
if(topmostVia.getPort() == -1)
topmostVia.setPort(listeningPoint.getPort());
branchId = sipRequest.getTopmostVia().getBranch();
SIPClientTransaction ct = (SIPClientTransaction) sipStack
.createMessageChannel(sipRequest, listeningPoint
.getMessageProcessor(), hop);
if (ct == null)
throw new TransactionUnavailableException("Cound not create tx");
ct.setNextHop(hop);
ct.setOriginalRequest(sipRequest);
ct.setBranch(branchId);
// if the stack supports dialogs then
if (sipStack.isDialogCreated(request.getMethod())) {
// create a new dialog to contain this transaction
// provided this is necessary.
// This could be a re-invite
// in which case the dialog is re-used.
// (but noticed by Brad Templeton)
if (dialog != null)
ct.setDialog(dialog, sipRequest.getDialogId(false));
else if (this.isAutomaticDialogSupportEnabled()) {
SIPDialog sipDialog = sipStack.createDialog(ct);
ct.setDialog(sipDialog, sipRequest.getDialogId(false));
}
} else {
if (dialog != null) {
ct.setDialog(dialog, sipRequest.getDialogId(false));
}
}
// The provider is the event listener for all transactions.
ct.addEventListener(this);
return (ClientTransaction) ct;
} catch (IOException ex) {
throw new TransactionUnavailableException(
"Could not resolve next hop or listening point unavailable! ",
ex);
} catch (java.text.ParseException ex) {
InternalErrorHandler.handleException(ex);
throw new TransactionUnavailableException(
"Unexpected Exception FIXME! ", ex);
} catch (InvalidArgumentException ex) {
InternalErrorHandler.handleException(ex);
throw new TransactionUnavailableException(
"Unexpected Exception FIXME! ", ex);
}
}