Prism-MW - Adaptable Architectural Middleware for Mobile and Resource Constrained Environments

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1 Prism-MW - Adaptable Architectural Middleware for Mobile and Resource Constrained Environments Marija Mikic-Rakic with Sam Malek and Nenad Medvidovic {marija,neno,malek}@usc.edu

2 Motivation Novel computing platforms Inexpensive, small, heterogeneous, resourceconstrained, highly distributed, mobile Prism -Programming-in-the-Small-and-Many Software architecture Useful in developing large-scale software systems Requires support for implementation Architectural Middleware Prism-MW 2

3 Prism-MW Objectives Architectural abstractions components, connectors, their configurations, communication events Efficiency impose minimal overhead on an application's execution Scalability devices, threads, components, connectors, and communication events Extensibility awareness, mobility, dynamic reconfigurability, security, real-time support, delivery guarantees 3

4 Prism-MW Core Design FIFOScheduler Scaffold IScheduler RRobinDispatch IDispatch Brick IScaffold 0..n Architecture Connector IConnector Event 0..n Component IComponent IArchitecture 4

5 Prism-MW Efficiency Thread Pool Component A Component B Connector C Component D send Request handlerequest XR N R R N R R 5

6 Distributed Event Dispatching Address space A2 Address space A3 Component A Component B β β 2 Distribution Connector C2 Distribution Connector C3 α α 2 Network Distribution Connector C Component D Thread Pool 7 2 Adaptation of an existing worker thread pool technique Topology based routing Single event queue for both locally and remotely generated events Easy redeployment and redistribution of applications onto different hardware configurations E E 2 E 3 E 4 Address space A E 6

7 Evaluation of Efficiency Time (ms) 50 } Event 50 0 Number of components Number of events Event Intel Pentium III 700 MHz,256 MB RAM JDK..8, Windows 2000 Type Core Component Connector Weld Event Memory overhead (KB) *num_parameters Prism-MW + 5 Components + Connector + Queue of 000 Events = KB 7

8 Prism-MW Scalability Connectors and Devices No middleware limitations Components (available_memory - middleware) / average_comp_size Threads and Events Time (ms) Threads Number of components 8

9 Prism-MW Extensibility EDF Scheduler RateMonotonic Scheduler FIFOScheduler Priority Dispatch IScheduler Scaffold Evt Frequency Moni tor RRobinDispatch IDispatch Brick IScaffold IMonitor 0..n Architecture RealTimeE Security Connector Socket Distribution IConnector Event IRDistribution Com pression ISecurity IDistribution ICompression Extensi ble Connector 0..n Component Extensible Component IComponent IArchitecture IAdmin Admin ArchRuntime Analysis Extensible Event IRealTimeEvent IDeliveryGuaranteesEvent Delivery Guarantees IConn Delivery Guarantees IXMLConversion IRuntimeAnalysis Delivery GuaranteesE XML Converter 9 Serializable

10 Tool Support Modeling and analysis Deployment and runtime monitoring 0

11 Example Prism Application

12 Current Status A large number of applications built Used in two graduate-level courses at USC Evaluated by two industrial organizations Future plans Supporting multiple architectural styles Automated selection of extensions 2

13 References Papers Marija Mikic-Rakic and Nenad Medvidovic. Adaptable Architectural Middleware for Programming-in-the-Small-and-Many. To Appear in Middleware 2003, Rio de Janeiro, Brazil, June M. Mikic-Rakic and N. Medvidovic. Middleware for Software Architecture-Based Development in Distributed, Mobile, and Resource-Constrained Environments. TR USC-CSE M. Mikic-Rakic and N. Medvidovic. Software Architecture-Based Development Support for Ubiquitous Systems. TR USC-CSE

Software engineers and practitioners traditionally

Software engineers and practitioners traditionally COVER FEATURE Software Architectural Support for Handheld Computing The authors present a software-architecture-based approach to support computing on distributed, handheld, mobile, resource-constrained