《BREW開發(fā)簡(jiǎn)介》PPT課件.ppt

1、BREW的介紹,2003年7月,什么是BREW,BREW: Binary Runtime Environment for wireless(二進(jìn)制運(yùn)行環(huán)境） Brew是一個(gè)無(wú)線平臺(tái)，通過(guò)COM風(fēng)格的API提供給上層應(yīng)用。 B：Binary，API是二進(jìn)制庫(kù)的集合。應(yīng)用程序可以被編譯和鏈結(jié)到特定的處理器（如ARM） R：Runtime，Applications and extensions are discovered at run time E:Environment,BREW provides a wealth of APIs and application management servi

2、ces. W:For wireless .BREW is a fast ,efficient,low RAM/FLASH enviroment,and specifically developed for wireless devices to allow applications to take advantage of wireless servieces,BREW結(jié)構(gòu),BREW結(jié)構(gòu),1、Device Layer Provides Primitives OS and Deviece Driver Functionality 2、OEM layer Provides services to

3、the AEE layer natively or through the Device Layer ChiL(Chip Interface Layer)Provides Baseband Chip Specific Services(e.g. GPS,Socket) MIL(Mobile Interface Layer) Provides Generic Baseband Chip Independent services(e.g. Database,Heap) 3、AEE layer Provides a uniform API to applications,BREW 文件和目錄,所有的

4、BREW文件和目錄名字都是小寫字母 BREW3.0將允許大小寫的文件名 四種文件類型 MIF：Module information File BAR：BREW Applet Resource File MOD：Binary Module File SIG：Digital Signature File,MIF,This file type contains information about each Module.Each module can contain One or More BREW applets or Extensions,and this type of file contai

5、ns information such as: Applet ClassIDs,names,Images,and settings General module information in text Privilege levels Exported ClassIDs and MIME types Module dependencies,BAR and MOD file,BAR: this file type contains the application resources:text strings,images and dialogs.This file type is used by

6、 the MOD files during execution.the BAR files are generated from BREW resource intermediate files(BRI) MOD: This file type is the dynamically loaded module executed at runtime.The applet Source files are compiles and linked into this MOD file type SIG: This file typecontains Digital Signature inform

7、ation to ensure the Integrity of each applet.When a Module is downloaded,this Signature file is verified by validating the binary and resource files,BREW Stacking and Management,BREW applet stacking Only one applet is visible at a time BREW maintains history list of application that have started and

8、 suspended Allows mix of OEM UI/MMI and BREW applets Allows one or more BREW applets to be started in sequences and mixed with OEM UI dialogs or applications BREW applets can run in the background if no display or keypad interaction is needed,BREW key Handling,When BREW is active,all key events need

9、 to be channeled to BREW after converting to AEE Virtual key code(AVK_*)of type AVKType There are four types of BREW Key Event: EVT_KEY_PRESS:sent when key is pressedcan be sent through AEE_KeyPress() EVT_KEY_RELEASE:Sent when key is releasedcan be sent through AEE_KeyRelease(),BREW key Handling,EVT

10、_KEY:Sent immediate after EVT_KEY_PRESS or Before EVT_KEY_RELEASE depending on the native UIs behavior EVT_KEY_HELD:Sent for keys being held Simultaneous key press is supported,BREW Classes,BREW uses COM style Interface Components can be dynamically interchanged without breaking old client It consis

11、ts if a well-defined interface and component implementations Exposed through VTBL All instances of the same class share the same VTBL Most BREW classes are reference counted to conserve memory,BREW classessingle Instance,Client,Interface vtbl Interface obj,BREW classesmultiple Instance,Client,Interf

12、ace vtbl obj 1 obj2,BREW Classes,Sample BREW Interface Declare Interface VTBL File: MyInterface.h Typedef struct IMyInterface IMyInterface; AEEINTERFACE(IMyInterface) DECALRE_Ibase(IMyInterface); int (*MyFunction1)(IMyInterface * po,int a); int (*MyFunction2)(IMyInterface * po); int (*MyFunction3)(I

13、MyInterface * po,boolean b); ;,BREW Classes,Define Function Macros #define IMYINTERFACE_Add(p) AEEGETPVTBL(p),IMyInterface)-AddRef(p) #define IMYINTERFACE_Release(p) AEEGETPVTBL(p),IMyInterface)-Release(p) #define IMYINTERFACE_MyFunction1(p,a) AEEGETPVTBL(p),IMyInterface)-MyFunction1(p,a) #define IM

14、YINTERFACE_MyFunction2(p) AEEGETPVTBL(p),IMyInterface)-MyFunction2(p) #define IMYINTERFACE_MyFunction3(p) AEEGETPVTBL(p),IMyInterface)-MyFunction3(p,b),BREW CLasses,Declare interface Class FILE: MyInterface.c Struct IMyInterface const AEEVTBL(IMyInterface)* pvt; int m_myData1; int m_myData2; int m_m

15、yData3; ;,BREW Classes,Define Interface VTBL Static const VTBL(IMyInterface) gMyFuncs = CMyInterface_AddRef, CMyInterface_Release, CMyInterface_MyFunction1, CMyInterface_MyFunction2, CMyInterface_MyFunction3 ;,BREW Classes,Interface Class Constructor int CMyInterface_New(Ishell * pIShell,AEECLSID cl

16、sid,void* pi) IMyInterface *pMe; *pi = 0; if(AEECLSID_MYCLSID != clsid) return EUNSUPPORTED; pMe = MALLOCREC(IMyInterface); if(!pMe) return ENOMEMORY; *pi = (void*)pMe; pMe-pvt = gMyFuncs; pMe-m_MyData1 = 0; . return SUCCESS; ,BREW Classes,IMyInterface,IMyInterface,BREW Classes,Many BREW Classes use

17、 Reference counting to conserve memory Reference counted objects are shared Objects are create when first used Subsequent creation of objects increments reference count through AddRef() Deletion of objects decrements reference count through Release() and last deletion destroys objects All BREW Class

18、es derive from Ibase and It declares AddRef() and Release() methods,BREW Classes,AddRef Increments reference count Object is created only the first time,Object,Client3,Client2,Client1,Create()/AddRef()/RefCnt=1,AddRef()/RefCnt=2,AddRef()/RefCnt=3,BREW Classes,Release Decrements reference count Objec

19、t is destroyed when reference count reachs zero,Object,Client3,Client2,Client1,Release()/RefCnt=2,Release()/RefCnt=1,Release()/RefCnt=0/Destroy(),OEM modules and classes,BREW is highly featurized and allows customization of handsets by adding or removing modules either statically or dynamically BREW

20、 modules are a collection of BREW classes Dynamic modules and classes are recognized through MIF file at run time Static modules and classes are organized in OEM mod table and featurized Features are defined in OEMFeatures.h,OEM Modules and Classes,Static BREW Modules Static BREW modules need Modinf

21、o functions to return module information: PFNMODENTRY MyMod_GetModInfo(Ishell* ps, AEECLSID* ppClasses,AEEAppInfo* pApps,unit16* pnApps,unit16* pwMinPriv); The function returns the entry point to a module Modinfo functions need to be externed extern PFNMODENTRY MyMod_GetModInfo(Ishell* ps, AEECLSID* ppClasses,AEEAp