System Introspection for System Analysis on Mobile Devices

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Figure 4.2: The different layer of BonSAI - The top layer containselements <strong>for</strong> complex behaviors, the middle layerholds functional components <strong>for</strong> base tasks and the bottomlayer controls low level hardware components [FromWachsmuth et al. (2011)]Open Handset Alliance 8 . The architecture behind Android provides an operatingsystem, middle-ware and several key applications placed in differentlayers (Figure 4.3). Android applications can be written with the Java programminglanguage through the Android SDK 9 . Android comes with support<strong>for</strong> wireless connections (Bluetooth, WIFI, EDGE, 3G), hardware components(cameras, GPS, accelerometer) and media support. Android relies on a Linuxkernel which acts as abstraction layer between hardware and software.Android offers an open development plat<strong>for</strong>m to allow developers the creationof rich and innovative applications. Each Android applications runs withinits own life cycle (Figure 4.4) and is called activity. An activity consists ofa class containing the logic and an XML file describing the layout of the activity.The life cycle describes the different states of an activity presented bydifferent methods. The onCreate()-method is called once an activity startsand initializes the components. The onStart()-method is triggered when allconfiguration of the creation state has ended. Once started the activity runsin the <strong>for</strong>eground of the device within the onResume()-method. In this methodthe interaction with the user takes place. If the user stops the activity it is notdirectly destroyed. The state of the activity is changed to onPause() and thenonStop(). In this state the operation system places the activity in the background.If the activity is requested again the onRestart()-method is called. Ifthe activity has been terminated by the operation system due to the need ofresources the onCreate()-method is called if the activity is requested. If theactivities interaction is finally finished the onDestroy()-method is called andthe activity ends. One application can contain several activities to provide interactionwith the user. The operating system there<strong>for</strong>e decides which activityis running in <strong>for</strong>eground and sends unused activities to the background.8 http://www.webcitation.org/5wiFwDWLg - Open Handset Alliance9 http://www.webcitation.org/5wrOKYh2w - Android Developer Guide15
Figure 4.3: The architecture behind android - The top layer containsstandard applications. The application frameworkoffers interface <strong>for</strong> high level components. The librariescontains functionality used by the application framework.The Linux kernel controls the low components and thehardware [From the Android Developer Guide]4.4 XMPP, Openfire and the SMACK LibraryFor the communication between the probe and the client a communicationframework is needed. In this thesis the communication framework of choiceis the Extended Messaging and Presence Protocol (XMPP 10 ). XMPP is anopen-standard communication protocol based on the Extensible Markup Language(XML11 ) published by the XMPP Standards Foundation (XSF 12 ). Saint-Andre (2005) gives an introduction on streaming XML with XMPP.XMPP uses streams to exchange XML elements between two entities over anetwork. The first-level child element send over such a stream is called stanza(Saint-Andre, 2004). There are three core stanzas <strong>for</strong> communication:used to push in<strong>for</strong>mation from one entity to anothersend in<strong>for</strong>mation about network availability of one entity<strong>for</strong> info or query in<strong>for</strong>mation between entities10 http://www.webcitation.org/5wiG3zxxE - Extended Messaging and Presence Protocol11 http://www.webcitation.org/5xNK6MKGA - Extensible Markup Language12 http://www.webcitation.org/5wiGCGjXV - XMPP Standards Foundation16
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
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Page 23 and 24: Figure 4.5: Typical instant messagi
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Page 27 and 28: Figure 5.2: Message exchange betwee
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Page 31 and 32: Figure 5.5: Reading and processing
Page 33 and 34: data and only forw
Page 35 and 36: For example a developer can select
Page 37 and 38: Figure 5.13: Principle of tabbed na
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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
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Page 55 and 56: LoginController which also observes
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Page 59 and 60: 7 EvaluationIn the previous chapter
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Page 69 and 70: 8 ConclusionsIn the context of this
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9 OutlookGiven this new tool its no
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BibliographyBurrell, A. and A. Soda
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6.10 Main classes of the Java clien
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AppendixUse CasesUse Case 1: Connec
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Use Case 4: Disconnect from compone
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Use Case 9: Sending beacon to keep
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Figure 9.4: Latency of receiving da
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System Introspection for System Analysis on Mobile Devices

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