Windows Azure Queue - Dec 2008.docx

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1、WindowsAzureQueueDecember,2008TableofContents1Introduction12BuildCloudApplicationswithAzureQueue23DataModel54QueueRESTInterface65QueueUsageExample75.1AProducer-ConsumerScenario75.2RESTRequestExamples85.2.1RESTPutMessage85.2.2RESTGetMessages95.2.3RESTDeleteMessage106B

2、estPractices116.1RetryTimeoutsand“ConnectionclosedbyHost”errors116.2TuneApplicationforRepeatedTimeouterrors116.3ErrorHandlingandReporting116.4ChoosingtheInvisibilityTimeforGetMessage126.5DeletingaMessagefromtheQueue126.6AdjustingWorkerRolesBasedonQueueLength136.7Usin

3、gBinaryFormatforMessages131IntroductionWindowsAzureisthefoundationofMicrosoft’sCloudPlatform.Itisan“OperatingSystemfortheCloud”,whichprovidesessentialbuildingblocksforapplicationdeveloperstowritescalableandhighlyavailableservices.WindowsAzureprovides:·VirtualizedComp

4、utation·ScalableStorage·AutomatedManagement·RichDeveloperSDKWindowsAzureStorageallowsapplicationdeveloperstostoretheirdatainthecloud,sotheapplicationcanaccessitsdatafromanywhereatanytime,storeanyamountofdataandforanylengthoftime,andbeconfidentthatthedataisdurableandw

5、illnotbelost.WindowsAzureStorageprovidesarichsetofdataabstractions:·WindowsAzureBlob–providesstorageforlargedataitems.·WindowsAzureTable–providesstructuredstorageformaintainingservicestate.13·WindowsAzureQueue–providesasynchronousworkdispatchtoenableservicecommunicat

6、ion.ThisdocumentdescribesWindowsAzureQueue,andhowtouseit.WindowsAzureQueueprovidesareliablemessagedeliverymechanism.Itprovidesasimpleandasynchronousworkdispatchmechanism,whichcanbeusedtoconnectdifferentcomponentsofacloudapplication.TheWindowsAzureQueuesarehighlyavail

7、able,durableandperformanceefficient.Itsprogrammingsemanticsensurethatamessagecanbeprocessedatleastonce.Furthermore,WindowsAzureQueuehasaRESTinterface,sothatapplicationscanbewritteninanylanguageandtheycanaccessthequeueatanytimefromanywhereintheInternetviatheweb.1Build

8、CloudApplicationswithAzureQueueWindowsAzureQueueallowsdecouplingofdifferentpartsofacloudapplication,enablingcloudapplicationstobeea