Building Scalable Web Apps with Windows Azure.pptx

BuildingScalableWebAppswithWindowsAzureNameTitleMicrosoftCorporationAgendaWhowillbenefitfromthistalkWebappdeveloperswhoarealreadyfamiliarwithWindowsAzurewithscalingneedsTopicsAsynchronouspatterns&essTuningapplicationperformanceWhatyou’llleavewithWindowsAzurehelpsyoubuildscalablewebappsusingtheapproachesthatyou’realreadyfamiliarwithSynchronousDesignPatternEachthreaddedicatedtooneoutstandingrequestBlockoneachstepof“thework”doneforeachrequest,thenrespond&repeatThisapproachscalespoorlyEachoutstandingrequestisstoredonathreadstackThreadsblockevenwhenthereisworktobedoneAddingathreadenablesonlyoneadditionalconcurrentrequestClientRequest#1WebAppFrontEndSQLAzureWAStorageMiddleTierClientResponse#1ClientRequest#2“TheWork”#1Response#1Timepasses…ThreadThreadWaiting…pletesClientRequest#1WebAppFrontEndSQLAzureWAStorageMiddleTierClientResponse#1ClientRequest#2“TheWork”#1Response#1ThreadThreadClientResponse#2“TheWork”#2Response#2ContextThisapproachscaleswellClientrequeststrackedexplicitlyinapp’sdatastructuresThreadsneverblockwhilethereisworktobedoneEachthreadcanhandlepossiblymanyconcurrentrequestsButbookkeeping&synchronizationcanbedifficult…Async/awaitsupportsimplifiesbookkeepingvoidUploadImage(Streamimage,CloudBlobdestBlob){//AddimagetolistinSQLAzureAddImageToSQLAzure();//UploadimagetoblobstorageUploadImageToBlob(image,destBlob);}asyncTaskUploadImageAsync(Streamimage,CloudBlobdestBlob){//AddimagetolistinSQLAzurevart1=AddImageToSQLAzureAsync();//Uploadimagetoblobstoragevart2=UploadImageToBlobAsync(image,destBlob);(t1,t2);}Buthowdowemakeoneofthese?Creatingasyncmethodsfrombegin/endpairsvoidUploadImageToBlob(Streamimage,CloudBlobdestBlob){(image);}asyncTaskUploadImageToBlobAsync(Streamimage,CloudBlobdestBlob){//<T>to//representaBegin/<Stream>(,,image,null);}