Later I had worked on the logical model. Among other things Balloon has classes responsible to render graphic object and classes responsible to load data. I have just improved this using an event/listener mechanism.
Also I turn many java classes on JavaBeans, firing property change events and so on that helps to improve the client programming.
Finally I have divided the load process between synchronous (working in the update thread) and asynchronous process (working in a new thread). For example, to load WMS images the load process starts as a synchronous process, checks if the images is cached in the local disk and if so loads it, otherwise changes it to an asynchronous mode and loads data from the network server.
Probably it must be better to write some docs to help the future programmers of Balloon ;)
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