Bug #5781 --> Add IsBusy method & CanHandleUrl.

a=chofmann

mailnews/imap/public/nsIImapProtocol.h

@@ -38,6 +38,7 @@
     { 0x80, 0x6e, 0x0, 0x60, 0x8, 0x12, 0x8c, 0x4e } }
 
 class nsIURL;
+class nsIImapUrl;
 class nsIImapHostSessionList;
 class nsIWebShell;
 
@@ -57,6 +58,19 @@ public:
 	/////////////////////////////////////////////////////////////////////////
 	NS_IMETHOD LoadUrl(nsIURL * aUrl, nsISupports * aConsumer) = 0;
 
+	///////////////////////////////////////////////////////////////////////// 
+	// IsBusy returns true if the connection is currently processing a url
+	// and false otherwise.
+	/////////////////////////////////////////////////////////////////////////
+	NS_IMETHOD IsBusy(PRBool & aIsConnectionBusy) = 0;
+
+	// Protocol instance examines the url, looking at the host name,
+	// user name and folder the action would be on in order to figure out
+	// if it can process this url. I decided to push the semantics about
+	// whether a connection can handle a url down into the connection level
+	// instead of in the connection cache.
+	NS_IMETHOD CanHandleUrl(nsIImapUrl * aImapUrl, PRBool & aCanRunUrl) = 0;
+
 	/////////////////////////////////////////////////////////////////////////
 	// Right now, initialize requires the event queue of the UI thread, 
 	// or more importantly the event queue of the consumer of the imap