wolfgang f. mader, peter steinbach€¦ · "we are uncovering better ways of developing...
TRANSCRIPT
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Software Development: Theory and Exercises
Wolfgang F. Mader, Peter Steinbach
Institute for Nuclear and Particle Physics, TU Dresden
March 11th, 2011
P. Steinbach (IKTP) SW Development March 11th, 2011 1 / 17
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Outline
Part 1: Theory
Introduction
Waterfall Model
Rational Unified Process by IBM
Agile DevelopmentThe Agile ManifestoAssorted Contents
Summary
Part 2: Exercises
Your TasksCombination of ErrorsCalibration Data Interface
Part 3: Possible Solutions
Combination of Errors
Calibration Interface
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Part I
Theory
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Introduction
If you sit down and ...
... start a project, what do you do?
I what is the purpose of my software?
I what should it do?
I who is to use it?
I how long will it live?
I what should I do first?
In nuce ...
... you enter the software development process!
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Waterfall Model
Waterfall Model, [3]
The Waterfall Model
I each step requires documentation
I one may reverse or forward only one interval
I very rigid process model
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Rational Unified Process by IBM
Rational Unified Process by IBM, [2]
The Rational Unified Process by IBM (RUP)
I developed at Rational (later bought by IBM)
I IBM sells adequate software to follow RUP
I first interative approach to software development
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Agile Development The Agile Manifesto
The Agile Manifesto, [1]
In 2001 ...
I 20 renowned computer scientists come together in Utah, USA
I goal: create lightweight and flexible software development process
I the agile movement was born
”We are uncovering better ways of developing software by doing it andhelping others do it. Through this work we have come to value:
Individuals and interactions over processes and toolsWorking software over comprehensive documentationCustomer collaboration over contract negotiationResponding to change over following a plan
That is, while there is value in the items on the right, we value the itemson the left more.”
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Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
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Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
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Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
![Page 11: Wolfgang F. Mader, Peter Steinbach€¦ · "We are uncovering better ways of developing software by doing it and helping others do it. Through this work we have come to value: Individuals](https://reader036.vdocuments.site/reader036/viewer/2022070917/5fb73937975726776659af55/html5/thumbnails/11.jpg)
Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
![Page 12: Wolfgang F. Mader, Peter Steinbach€¦ · "We are uncovering better ways of developing software by doing it and helping others do it. Through this work we have come to value: Individuals](https://reader036.vdocuments.site/reader036/viewer/2022070917/5fb73937975726776659af55/html5/thumbnails/12.jpg)
Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
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Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
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Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
![Page 15: Wolfgang F. Mader, Peter Steinbach€¦ · "We are uncovering better ways of developing software by doing it and helping others do it. Through this work we have come to value: Individuals](https://reader036.vdocuments.site/reader036/viewer/2022070917/5fb73937975726776659af55/html5/thumbnails/15.jpg)
Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
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Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
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Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
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Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
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Agile Development Assorted Contents
Assorted Contents
Main Building Blocks
I Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
I Welcome changing requirements, even late in development. Agile processes harness change for thecustomer’s competitive advantage.
I Deliver working software frequently, from a couple of weeks to a couple of months, with a preference tothe shorter timescale.
I Business people and developers must work together daily throughout the project.
I Build projects around motivated individuals. Give them the environment and support they need, andtrust them to get the job done.
I The most efficient and effective method of conveying information to and within a development team isface-to-face conversation.
I Working software is the primary measure of progress.
I Agile processes promote sustainable development. The sponsors, developers, and users should be ableto maintain a constant pace indefinitely.
I Continuous attention to technical excellence and good design enhances agility.
I Simplicity–the art of maximizing the amount of work not done–is essential.
I The best architectures, requirements, and designs emerge from self-organizing teams.
I At regular intervals, the team reflects on how to become more effective, then tunes and adjusts itsbehavior accordingly.
P. Steinbach (IKTP) SW Development March 11th, 2011 8 / 17
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Summary
Summary
I software development techniques apply to teams working on projects
I some models are for fixed requirements
I some for ever changing requirements
I agile development has forged many techniques that are worthwhile to studyfor HEP
I Pair ProgrammingI Unit Testing (Test Driven Design)I RefactoringI Continuous IntegrationI ...
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Part II
Exercises
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Your Tasks
Putting it all together
I The goal of this exercise is to obtain an almost complete UML description of theproject.
I You are free to add features to or to choose your own project, if none on the listinterests you.
I Please work in groups of 3 − 6 people.
I Try to collect your thoughts in the end, so that your design can be presented to thegroup.
time
Let’s reconvene here at 11.30 am to compare results!
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Your Tasks Combination of Errors
Topics: Combination of Errors
Goal
Write a HistoHandler that extracts and displays systematic errors for a given histogram.
Input
I histos with central value
I histos with uncertainties
I recipe how to combine uncertainties
Output
I The result plot in which the statistical AND the total systematic error are displayed as error bars
Aside
I extraction of histo objects is done automatically for you!
I how to pass recipe to handler?
I maybe extend this design to have multiple outputs?
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Your Tasks Calibration Data Interface
Topics: Calibration Data Interface
Goal
Write a CalibrationInterface that extracts and stores calibration constants for a given physicalquantity in a file.
Input
I file with TH1/TF1/XML style data
I recipe what to retrieve from the file
I recipe what/how to calculate values from what was stored in file
I recipe how to invert retrieval
Output
I a calculated calibration constant
I a file containing calibration constants
Aside
I try to imagine the difficult read/write calls to be handled by a service!
I don’t invest time contemplating performance
I concentrate on how to represent the data and how to formulate recipes!
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Part III
Possible Solutions
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Combination of Errors
A Solution to ”Calibration Data Interface”
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Calibration Interface
A Solution to ”Calibration Data Interface”
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References
[1] Kent Beck et al.Agile manifesto.agilemanifesto.org.
[2] Ivar Jacobson, Grady Booch, and James Rumbaugh.The Unified Software Development Process.Addison-Wesley Professional, 1999.
[3] Nicholas Solter and Scott Kleper.Professional C++ (Programmer to Programmer).Wrox, 2005.
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