System Introspection for System Analysis on Mobile Devices

Each view adds a listener to the communicator whenever the onResume()method is called. To save system resources, this listener is removed fromthe communicator whenever a view is deactivated by calling the onPause()method. The idea behind this principle is to reduce system load by readingmessages only on notify be the communicator.TabLogDisptacher - Initiating new Logging CyclesThe TabLogDispatcher view communicates with the LogDispatcher and requeststhe list of available logging components. To allow the configuration ofcomponents to be logged on the probe available logging component are presentedas selectable list. By executing a logging cycle the client adds properties<strong>for</strong> each selected component to a message <strong>for</strong>warded to the LogDispatcher.While the logging process is active, all elements on the view are deactivated exceptthe stop button. Executing the stop process sends a stop command to theLogDispatcher. When the current tab view changes the TabLogDispatchterdoes not stop the logging cycle on the probe. This allows to use the live observationeven if a logging process is active. Figure 6.9 shows the logging view.(a) available logging components(b) Executed logging cycleFigure 6.9: Starting logging cycles - The TabLogDispatcher viewcontrols the creation of logging cycles on the probe. Ifthe active tab is changed while a logging cycle is active,the logging cycle on the probe is not stopped.6.4.2 Java Client on Desktop MachineFor using the client on a common computer a prototype of the client was implemented.Due to more resources the application shows more in<strong>for</strong>mationcombined on one screen. Like the mobile client a tabbed navigation is used to48