Prof. Dr. R. H. Reussner (reussner@ipd.uka.de)
Lehrstuhl Software-Entwurf und ­Qualität
Institut für Programmstrukturen und Datenorganisation (IPD)
Fakultät für Informatik, Universität Karlsruhe (TH)
Universität Karlsruhe (TH)
Forschungsuniversität gegründet 1825
Praktikum Ingenieurmäßige
Software-Entwicklung
Palladio Component Model (PCM)
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Outline
1.Introduction
a. Roles, Process Model, Example
b. Solver (Simulation, Analytical Model)
2.Component Developer
a. Repository
b. Component, Interface, Data Types
c. SEFF
3.Stochastical Expressions
a. Constants, PMF, PDF, Parameter
Characterisation
b. Parametric Dependencies
Palladio Component Model 17.08.2007 2
Lecture 1
Lecture 2
Lecture 3
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Outline
4.Software Architect
a) System (Composed Structure)
b) QoS Annotations on System Interfaces
5.System Deployer
a) Resource Types, Resource Environment
b) Allocation
6.Domain Expert
a. Usage Model
b. Parameter Characterisations
7.Solver, Result Interpretation
8.Comprehensive Case Study
9.Outlook
Palladio Component Model 17.08.2007 3
Lecture 4
Lecture 5
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Outline
1.Introduction
a. Roles, Process Model, Example
b. Solver (Simulation, Analytical Model)
2.Component Developer
a. Repository
b. Component, Interface, Data Types
c. SEFF
3.Stochastical Expressions
a. Constants, PMF, PDF, Parameter
Characterisation
b. Parametric Dependencies
Palladio Component Model 17.08.2007 4
Lecture 1
Lecture 2
Lecture 3
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
 Developed at Uni Oldenburg,
Uni Karlsruhe since 2003
 Domain-specific
Modelling Language
 Targeted at
­ Performance Prediction
for Component-based Software Architectures
­ Business Information Systems
 Extensive Metamodel in EMF/Ecore
 Named after famous Renaissance Architect
Palladio Component Model
Palladio Component Model 17.08.2007 5
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
CBSE Development Process
Palladio Component Model 17.08.2007 6
[Cheeseman2000, Koziolek2006a]
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Developer Roles
Palladio Component Model 17.08.2007 7
Palladio Component Model 17.08.2007 8
Component
Developers
Software
Architect
System
Deployer
Domain
Expert
[Becker2007a]
Palladio Component Model 17.08.2007 9
Dom. Exp.
DSL Instance
Sys. Depl.
DSL Instance
Soft. Arch.
DSL Instance
Comp.Dev.
DSL Instance
Stochastic
Regular Expr.
Analysis
SPA with
Scheduling
Analysis +
Simulation
Queueing
Network
Performance
Prototype
Java Code
Skeletons
Simulation
Execution +
Measurement
Completion +
Compilation
Instance
Palladio
Component
Model
[Becker2007a]
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Repository
Palladio Component Model 17.08.2007 10
Component
Developer
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Service Effect Specification
Palladio Component Model 17.08.2007 11
Component
Developer
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
System
Palladio Component Model 17.08.2007 12
Software
Architect
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Resource Environment
Palladio Component Model 17.08.2007 13
System
Deployer
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Usage Model
Palladio Component Model 17.08.2007 14
Domain
Expert
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Model Solver
Palladio Component Model 17.08.2007 15
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Model Solver
PCMSolver
 Only Single User
 Fast (~2-5 seconds)
 Analytical Method,
High Precision
 Stochastic Process
Algebra based
 Traverses the
architecture once
 Directly convolutes
specified probability
functions
SimuBench
 Single + Multiple User
 Slow (~30-600 sec.)
 Process-based
Simulation
 Queueing Network
based (G/G/n)
 Traverses the
architecture repeatedly
 Draws samples from
probability functions,
adds them up
Palladio Component Model 17.08.2007 16
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Example
 Blog-System 
 Switch to Eclipse!
Palladio Component Model 17.08.2007 17
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Outline
1.Introduction
a. Roles, Process Model, Example
b. Solver (Simulation, Analytical Model)
2.Component Developer
a. Repository
b. Component, Interface, Data Types
c. SEFF
3.Stochastical Expressions
a. Constants, PMF, PDF, Parameter
Characterisation
b. Parametric Dependencies
Palladio Component Model 17.08.2007 18
Lecture 1
Lecture 2
Lecture 3
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Tasks
 Specifies Component & Interfaces
 Specifies Data Types
 Builds Composite Components
 Creates Service Effect Specifications
 Stores Modelling & Implementation
Artefacts in Repositories
 Implements Components
 Tests Components
 Maintains Components
Palladio Component Model 17.08.2007 19
Component
Developer
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Example Repository
Palladio Component Model 17.08.2007 20
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Example Repository
Palladio Component Model 17.08.2007 21
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Interfaces
Palladio Component Model 17.08.2007 22
[Beugnard1999]
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
PCM Interfaces
 QoS (=Performance, Reliability)
­ Service Effect Specification (Lecture 2)
 Protocol (=Valid Call Sequences)
­ Finite State Machine (Not shown here)
 Signature
­ Corba IDL:
* Return Type
* Name
* Parameter List
* Exception List
Palladio Component Model 17.08.2007 23
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
PCM Component Types
Palladio Component Model 17.08.2007 24
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Provided Component Type
 Only Provided Interfaces mandatory
 May contain required services,
not mandatory
 Specified during early development,
refined later
 Situation: certain functionality needed,
but additionally required services unknown
 QoS Annotations
Palladio Component Model 17.08.2007 25
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Complete Component Type
 Provided and Required Interfaces
mandatory
 Dependencies between Provided and
Required Interfaces not fixed
 Situation: Needed functionallity known,
component environment also fixed
Palladio Component Model 17.08.2007 26
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Basic Component
 Provided/Required Interfaces mandatory
 One option to implement a Complete Type
 Service Effect Specification for
Dependencies between Provided and
Required Interfaces
 May be composed to Composed
Components
Palladio Component Model 17.08.2007 27
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Composite Component
 During development composed from any
component types
 Finally composed from Basic Components
and/or other Composite Components
 Likely not used in the experiment, but may
occur in exercises
Palladio Component Model 17.08.2007 28
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Data Types
 Primitive Datatype
­ INT, CHAR, BOOL, DOUBLE, LONG, ...
 Collection Datatype
­ Contains an inner primitive datatype
­ ARRAY, SET, LIST, TREE, HASHMAP, ...
 Composite Datatype (Struct)
­ Contains inner primitive
and/or collection and/or composite datatypes
­ ADDRESS, CUSTOMER, PERSON, ...
Palladio Component Model 17.08.2007 29
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Hands on Example
 Switch to PCMBench
Palladio Component Model 17.08.2007 30
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Outline
1.Introduction
a. Roles, Process Model, Example
b. Solver (Simulation, Analytical Model)
2.Component Developer
a. Repository
b. Component, Interface, Data Types
c. SEFF
3.StoEx
a. Constants, PMF, PDF, Parameter
Characterisation
b. Parametric Dependencies
Palladio Component Model 17.08.2007 31
Lecture 1
Lecture 2
Lecture 3
SD
Xperf=1.00
Xloss=0.01
Software Design
and Quality
Lessons Learned Today
 Person ­ Role ­ Task
 Component Developer, Software Architect,
System Deployer, Domain Expert
 PCMSolver vs. SimuBench
 PCM Repository (Component Developer)
­ Components
(Provided, Complete, Basic, Composite)
­ Interfaces
(Signature, Protocol, SEFF)
­ Data Types
(Primitive, Collection, Composite)
Palladio Component Model 17.08.2007 32