An Architecture to Support Dynamic Composition of Service Components and its Applicability to Internet Security

........................................................................................................................ iii Acknowledgments ........................................................................................................ iv List of Figures ............................................................................................................... x Chapter 1: Introduction ................................................................................................. 1 1.0 Thesis Objective ........................................................................................... 1 1.1 Motivation .................................................................................................... 1 1.1.1 Trends Indicating the Need for Composite Services ............................... 3 1.1.1.1 Managing Increased Complexity ........................................................ 3 1.1.1.2 Engine-Oriented Software Applications ............................................. 4 1.1.1.3 Cross-Domain Services ...................................................................... 5 1.1.1.4 Bridging Network Protocols ............................................................... 5 1.1.2 Trends Indicating the Need for Dynamic Service Composition ............. 6 1.1.2.1 Internet Security ................................................................................. 6 1.1.2.2 Tailoring Services to Particular Devices (Service Adaptation) .......... 6 1.1.3 Proposed Approach ................................................................................ 7 1.2 Thesis Contributions .................................................................................... 8 1.3 Thesis Organization ..................................................................................... 9 Chapter 2: State of the Art in Dynamic Service Composition ...................................... 11 2.0 Overview ...................................................................................................... 11 2.1 Terminology ................................................................................................. 11 2.1.1 Service Component ................................................................................. 11 2.1.2 Service ..................................................................................................... 12 2.1.3 Composition Method................................................................................ 13 2.2 Goals of Service Composition ..................................................................... 13 2.2.1 Static Composition .................................................................................. 13 2.2.2 Dynamic Composition ............................................................................. 15 2.3 Why Dynamic Composition is Inherently Difficult ..................................... 15 2.4 The Case for Dynamic Service Composition ............................................... 17 2.4.1 Benefits .................................................................................................... 18 2.4.2 Arguments Against................................................................................... 20 2.5 Techniques for Dynamic Service Composition ........................................... 22 2.5.1 Run-time Reconfiguration Using Wrappers ............................................ 23 2.5.2 Runtime Component Adaptation ............................................................. 27 2.5.2.1 Superimposition .................................................................................. 27 2.5.2.2 Type-Safe Delegation and Dynamic Component Re-wiring .............. 30 2.5.3 Composition Languages .......................................................................... 36 2.6 Related Work ............................................................................................... 39 2.6.1 Distributed Feature Composition ............................................................ 39 2.6.2 CHAIMS ................................................................................................. 41