Download Common Design Patterns for Symbian OS: The Foundations of by Adrian J. Issott PDF

By Adrian J. Issott

Universal layout styles for Symbian OS is the 1st layout styles e-book that addresses Symbian OS particularly. It introduces programmers to the typical layout styles that support enforce a wide number of purposes and companies on Symbian OS. The target of the ebook is to supply the adventure of Symbian's builders to a much broader viewers and permit refined courses to be fast written and to a excessive common. with a purpose to do that, it:

  • Provides styles in keeping with the Symbian OS architectural components
  • Describes how styles fitted to non-mobile software program could be tailored or perhaps kept away from for Symbian OS
  • Provides Symbian OS dependent examples and code illustrations

every one bankruptcy covers styles that handle particular key obstacle skilled via builders: reminiscence functionality, time functionality, energy functionality, defense and responsiveness.

This publication isn't particular to any specific model of Symbian OS. whereas person examples could come from one model or one other the styles defined during this booklet are meant to be extra universal and according to the typical performance to be had in all releases. the place attainable the examples given for the layout styles will at once replicate the software program in Symbian OS.

universal layout styles for Symbian OS is meant for use along side a number of SDKs for particular Symbian OS telephones and with the assets on hand on the Symbian DevNet website. This facility will give you the heritage fabric had to aid comprehend the styles and the examples accompanying them.

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Additional info for Common Design Patterns for Symbian OS: The Foundations of Smartphone Software (Symbian Press)

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3) revolves around the following two concepts: • The caller is the higher-layer component that makes a function call to another component. This component is aware of the motivation for the function call and hence how to resolve any system or domain errors that might occur. 17 One of the cardinal sins on Symbian OS. 3 Structure of Escalate Errors pattern • The callee is the lower-layer component on which the function call is made. This component is responsible for attempting to satisfy the function call if possible and detecting any system or domain errors that occur whilst doing so.

The drawbacks of ensuring your software is reliable are mainly the increased effort and cost of development and testing. A major part of ensuring that your software is reliable on a mobile device is designing in ways of handling sudden power loss gracefully. The expectation of an end user is that they will be able to continue seamlessly from where they left off once they’ve restored power to the device in some way. As power can be lost at any time and your software is probably given very little warning, this means the normal activity of your component must take this into account by, for instance, regularly saving data to disk.

Minimal execution time The execution time for a piece of software can have a number of meanings. Usually you are concerned about a particular use case, whether it’s starting an application or responding to a key press from the end user, and wish to measure the time taken between that use case starting and ending. You can also start taking into account the amount of time your software was active during the use case. However, the main concern is to make your use case execute in as short a time as possible.

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