This blog post extends the diagram presented earlier explaining the global architecture of CTI in XiVO.
Here is what the XiVO Client looks like from a developer point of view:
This is the new architecture that will be included in our new development iteration beginning on Monday, 3rd October.The main change is the "creation" of the XLetlib, that was previously into the Baselib. The Baselib will be progressively stripped of everything not necessary: the goal is to make it a reusable component, which will only manage the connection with the CTI server.
Everything in the XiVO Client is written in C++ and Qt.
Let's explicit the spaghetti plate above a little :XLets, for XiVO applets, are plugins to the XiVO Client. Almost every function of the XiVO Client is pluggable/unpluggable, depending on the server configuration to allow some XLet to be activated. You can see what XLets look like in the XiVO wiki (each tab is an XLet).
Each XLet can use the tools available in the XLetlib, that are mainly GUI elements used to display information in a consistent way within all XLets. They are also given access to the Baselib "API" (it is an API, but scarcely documented for the time being), that receives or sends CTI events and informations to the CTI server, such as "a new phone has registered to Asterisk", "you have a new telephone message", "I want to call this number", etc.
Of course, there are some options available to control how the XiVO Client behaves ; about half of them control GUI aspects and the other half control how the connection is established to the server. The GUI related options are some of the things we still have to migrate out of the Baselib, because someone wanting to connect to the CTI server through our Baselib does not care that the XiVO Client presence indicator is 5 pixels wide...
About the communication protocol between the XiVO Client and the CTI server, everything is JSON encoded. For now, there is no compatibility between protocol versions, but we're thinking about it. The goal is to be able to release XiVO Client upgrades without having to wait for the XiVO distribution to be released, especially if the new version introduces mainly GUI improvements. But this can't happen if an "old" server can not talk with a more recent client.
One could think that working on the XiVO Client may be boring, as it's only easy GUI stuff, placing a button here, making it violet with green dots for obscure marketing reasons. There's a part of GUI stuff, of course, but I find the plugins-only, freely movable (in dock mode) interface concept very interesting, it makes the XiVO Client a potential swiss-army knife, to which anyone can choose exactly the tools he needs, no more, no less.