System Introspection for System Analysis on Mobile Devices

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Also the component dispatcher knows all component threads available and can<strong>for</strong>ward the state of each component thread to the client. This allows the clientto monitor the state of components from the robot without directly connectingto a component thread. To receive requests the component dispatcher observesthe communication interface <strong>for</strong> commands (Figure 5.7). Main functionalitiesare connecting a client with a component thread, disconnecting clients fromcomponent threads and sending the list of all component threads available. Thecomponent dispatcher knows the list of connected clients. Whenever a clientdisconnects, the component dispatcher removes the client from all componentthreads the client was connected to. The component dispatcher adds clientsrequesting data to the list of the requested component thread. If the thread isinactive the component dispatcher starts the component thread. The designof the probe allows to configure which component threads are available bychanging a configuration file.Figure 5.7: Processing commands <strong>for</strong> Component Threads - TheComponent Dispatcher checks the incoming commands.If a client requests a Component Thread it is added tothe list of clients known to the Component Thread. Adisconnect command send to the Component Thread removesthe client from the list. The list of all availableComponent Threads can be requested from the ComponentDispatcher.Component Threads - Live Observation of Robot ComponentsTo fulfill the requirement of multi user connection and collecting data in parallel,the elements used <strong>for</strong> live observation use threading. Threading allowscomponent threads to collect data in parallel and makes multi user observationpossible due to handling multiple requests at once. A component threadis reading the data via the component holder and filters it to the needs of thedeveloper (Figure 5.8). In this thesis filtering means to extract parts of the27
data and only <strong>for</strong>ward the extracted data. The result is <strong>for</strong>warded as messageto the client via the communication interface. Each component threadis holding a list of all clients that have currently requested the componentthread. If no client is connected, the component thread is inactivated. Thecomponent thread needs to listen to the communication interface <strong>for</strong> directcommands from clients. To achieve this, every component thread is observingthe communication interface and checks every message <strong>for</strong> its TAG. Messagecontaining the TAG are processed by the component thread. Each componentthread can acquire a special state. Possible states are SLEEPING, RUNNINGor ERROR. Inactive threads in SLEEPING state have no clients connectedand do not collect data from the component holder. Active threads in RUN-NING state read data and <strong>for</strong>ward it to connected clients. Whenever an erroroccurs the state is changed to ERROR. Examples can be a robot componentnot reachable due to system failure. To control the update rate of each componentthread the delay between two reading cycles can be configured in theconfiguration file.Figure 5.8: Component Thread collecting and publishing data - Aftercreating and initializing the list of connected clients ischecked. If no client is connected the Component Threadbecomes inactive until the Component Dispatcher activatesit. If clients are connected the Component Threadreads the components of the robot via the ComponentHolder and <strong>for</strong>wards the data to the connected clients.Logging DispatcherThe logging dispatcher controls logging cycles requested by clients. To monitorall created cycles the logging dispatcher holds a local list containing clientsand their logging cycle. The logging dispatcher observes the communicationinterface <strong>for</strong> new requests and holds a reference to the list of connected clients.28
Page 1: Bringing System <s
Page 5 and 6: AbstractSystem <st
Page 7 and 8: output, so each component is offeri
Page 9 and 10: of the system and the decisions mad
Page 11 and 12: created a telelaboratory where two
Page 13 and 14: Like the telelaboratory there is a
Page 15 and 16: with a very high frequency which ma
Page 17 and 18: Due to improving technology the use
Page 19 and 20: Figure 4.1: ToBI platfor</s
Page 21 and 22: Figure 4.3: The architecture behind
Page 23 and 24: Figure 4.5: Typical instant messagi
Page 25 and 26: 5 System DesignThe
Page 27 and 28: Figure 5.2: Message exchange betwee
Page 29 and 30: Figure 5.4: Beacon running between
Page 31: Figure 5.5: Reading and processing
Page 35 and 36: For example a developer can select
Page 37 and 38: Figure 5.13: Principle of tabbed na
Page 39 and 40: 6.1 The Communication InterfaceThe
Page 41 and 42: 6.2 The Probe - Implementation of t
Page 43 and 44: stop all active processes of the co
Page 45 and 46: is received containing the TAG of t
Page 47 and 48: The selected sensors give a good im
Page 49 and 50: 1 2 4 6 8 Listing 6.2: Example of t
Page 51 and 52: TabConfig - The Status ViewThe TabC
Page 53 and 54: Each view adds a listener to the co
Page 55 and 56: LoginController which also observes
Page 57 and 58: tends the JPanel class. The templat
Page 59 and 60: 7 EvaluationIn the previous chapter
Page 61 and 62: Name Description CharactersSingleli
Page 63 and 64: Figure 7.1: Latency of receiving da
Page 65 and 66: For this thesis only a rough estima
Page 67 and 68: Laptop CPU load without Probe CPU l
Page 69 and 70: 8 ConclusionsIn the context of this
Page 71 and 72: 9 OutlookGiven this new tool its no
Page 74: BibliographyBurrell, A. and A. Soda
Page 77 and 78: 6.10 Main classes of the Java clien
Page 79 and 80: AppendixUse CasesUse Case 1: Connec
Page 81 and 82: Use Case 4: Disconnect from compone
Page 83 and 84:
Use Case 9: Sending beacon to keep
Page 85 and 86:
Figure 9.4: Latency of receiving da
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