Download Applying UML and Patterns: An Introduction to by Craig Larman PDF

By Craig Larman

* A fresh variation of the world’s such a lot famous creation to object-oriented research and layout with UML
* Fully up to date for UML 2 and the newest iterative/agile practices
* Includes an all-new case examine illustrating some of the book’s key points

Applying UML and Patterns is the world’s number one company and school creation to “thinking in objects”—and utilizing that perception in real-world object-oriented research and layout. construction on broadly acclaimed earlier versions, Craig Larman has up to date this publication to completely replicate the hot UML 2 common, that will help you grasp the artwork of item layout, and to advertise high-impact, iterative, and skillful agile modeling practices.

Developers and scholars will research object-oriented research and layout (OOA/D) via 3 iterations of 2 cohesive, start-to-finish case experiences. those case stories incrementally introduce key abilities, crucial OO ideas and styles, UML notation, and most sensible practices. You won’t simply examine UML diagrams—you’ll easy methods to apply UML within the context of OO software program improvement.

Drawing on his unsurpassed adventure as a mentor and advisor, Larman is helping you recognize evolutionary specifications and use situations, area item modeling, responsibility-driven layout, crucial OO layout, layered architectures, “Gang of Four” layout styles, take hold of, iterative equipment, an agile method of the Unified technique (UP), and lots more and plenty extra. This edition’s large advancements comprise
* a better specialize in assisting you grasp OOA/D via case stories that show key OO rules and styles, whereas additionally utilizing the UML
* New assurance of UML 2, Agile Modeling, Test-Driven improvement, and refactoring
* Many new pointers on combining iterative and evolutionary improvement with OOA/D
* Updates for less complicated research, together with new studying aids and pix
* New collage educator educating resources
* counsel on utilizing the UP in a gentle, agile spirit, complementary with different iterative tools reminiscent of XP and Scrum
* options for employing the UML to documenting architectures
* a brand new bankruptcy on evolutionary requisites, and masses more

Applying UML and styles, 3rd Edition, is a lucid and useful creation to considering and designing with objects—and growing structures which are good crafted, powerful, and maintainable.

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Extra resources for Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and Iterative Development (3rd Edition)

Sample text

This includes CPU usage, memory and network or I/O bandwidth. If an application is causing one or more resource limits to be hit, then the result will be a performance problem. It is also worth noting that the operating system itself should not normally be a major contributing factor to system utilisation. The role of an operating system is to manage resources on behalf of user processes, not to consume them itself. The only real exception to this rule is when resources are so scarce that the OS is having difficulty allocating anywhere near enough to satisfy user requirements.

Two basic tools that every performance engineer should be aware of are vmstat and iostat. On Linux and other Unixes, these command-line tools provide immediate and often very useful insight into the current state of the virtual memory and I/O subsystems, respectively. The tools only provide numbers at the level of the entire host, but this is frequently enough to point the way to more detailed diagnostic approaches. Let’s take a look at how to use vmstat as an example: ben@janus:~$ vmstat 1 r b swpd free buff cache 2 0 0 759860 248412 2572248 2 0 0 759002 248412 2572248 1 0 0 758854 248412 2572248 3 0 0 758604 248412 2572248 2 0 0 758932 248412 2572248 2 0 0 759860 248412 2572248 si 0 0 0 0 0 0 so bi bo 0 0 80 0 0 0 0 0 80 0 0 14 0 0 96 0 0 0 in 63 55 57 65 52 60 cs us sy id wa st 127 8 0 92 0 0 103 12 0 88 0 0 116 5 1 94 0 0 142 10 0 90 0 0 100 8 0 92 0 0 112 3 0 97 0 0 The parameter 1 following vmstat indicates that we want vmstat to provide ongoing output (until interrupted via Ctrl-C) rather than a single snapshot.

For the performance analyst / engineer, it suffices to have an awareness of the I/O behavior of our applications. g. blocks in or out) that are often all we need for basic diagnosis, especially uf we make the assumption that only one I/O-intensive application is present per host. Finally, it’s worth mentioning one aspect of I/O that is becoming more widely used across a class of Java applications that have a dependency on I/O but also stringent performance applications. Kernel Bypass I/O For some high-performance applications, the cost of using the kernel to copy data from, for example, a buffer on a network card, and place it into a user space region is prohibitively high.

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