4.4

Client Side Proxy Design and Operation ...........................................................4 44

4.4.1 Proxy Architecture Overview .........................................................................4 45 

4.4.2 HTTPQoS Filter Architecture .........................................................................4 47 

4.4.3 Operation of the Jigsaw Proxy and the HTTPQoS filter.................................4 48 

4.5

Information Architecture.....................................................................................4 52

4.5.1 SLA Design .....................................................................................................4 52 

4.5.2 Parameter Definition ....................................................................................... 4 56 

4.5.3 Database Design.............................................................................................. 4 56 

4.6

Conclusion...........................................................................................................4 57

5

IMPLEMENTATION...............................................................................................5 58

5.1

Introduction.........................................................................................................5 58

5.2

HTTPQoS Filter ..................................................................................................5 58

5.2.1 Monitoring HTTP Message Content Length and Transfer Time....................5 59 

5.3

DBQoSLogger .....................................................................................................5 63

5.4

QoSParameters ...................................................................................................5 63

5.5

Configuring the HTTPQoS Filter on Jigsaw ......................................................5 64

5.6

Summary..............................................................................................................5 65

6

EVALUATION AND CONCLUSION....................................................................6 66

6.1

Introduction.........................................................................................................6 66

6.2

Evaluation  Overview ..........................................................................................6 66

6.3

Case Study: Yahoo Mail......................................................................................6 66

6.3.1 Test Environment ............................................................................................6 66 

6.3.2 SLA Defined for Case Study...........................................................................6 68 

6.3.3 Services List ....................................................................................................6 71 

6.3.4 SLA and Services List Deployment................................................................6 71 

6.3.5 Proxy Initialisation ..........................................................................................6 71