Download e-book for kindle: Common Design Patterns for Symbian OS: The Foundations of by Adrian J. Issott

By Adrian J. Issott

ISBN-10: 0470516356

ISBN-13: 9780470516355

ISBN-10: 0470758961

ISBN-13: 9780470758960

Universal layout styles for Symbian OS is the 1st layout styles publication 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 objective of the e-book is to supply the adventure of Symbian's builders to a much broader viewers and allow subtle courses to be fast written and to a excessive normal. as a way to do that, it:

  • Provides styles in response to the Symbian OS architectural components
  • Describes how styles fitted to non-mobile software program might be tailored or maybe kept away from for Symbian OS
  • Provides Symbian OS established examples and code illustrations

every one bankruptcy covers styles that handle particular key drawback skilled by way of builders: reminiscence functionality, time functionality, energy functionality, protection and responsiveness.

This e-book isn't particular to any specific model of Symbian OS. whereas person examples may perhaps come from one model or one other the styles defined during this e-book are meant to be extra established 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 mirror the software program in Symbian OS.

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

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In addition, there is the logic to map the API and the protocol together. Although initially this may appear to be fairly straightforward, for an open operating system this is rarely the case. There can be multiple, distinct GAVDP clients using the protocol to communicate with multiple devices, or even the same device. The stack is required to co-ordinate these requests and responses in a robust and efficient manner. We hope to have convinced you that the Symbian OS GAVDP/AVDTP protocol implementation is a complex component of software.

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.

For example, if the engine of an application encounters a disk full error when trying to save the user’s data, it is not able to start deleting files to make space without consulting the end user. So instead it escalates the error upwards to the UI layer so that the end user can be informed. It would be inappropriate to use Fail Fast (see page 17) to resolve such errors by panicking. Whilst it does have the advantage of resolving the current error condition in a way which ensures that the integrity of data stored on the phone is unlikely to be compromised, it is too severe a 14 Such as by using Fail Fast (see page 17) when there was a possibility of a safe recovery.

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Common Design Patterns for Symbian OS: The Foundations of Smartphone Software (Symbian Press) by Adrian J. Issott

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