پاورپوینت کامل Cloud Computing: Basic Architecture 41 اسلاید در PowerPoint

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پاورپوینت کامل Cloud Computing: Basic Architecture 41 اسلاید در PowerPoint

اسلاید ۴: Background Part 0: VirtualizationYou can’t physically touch the cloud server machines. Hardware can and frequently will change. To avoid dependency on specific hardware, you generally write your server program to run on virtual machines.

اسلاید ۵: Background Part 0: Virtualization DiagramCloud StackVirtual Machine ManagerOperating SystemHardwareCloud ApplicationsCloud Services

اسلاید ۶: Background Part 1: AbstractionObjects used locally represent a combination of code and data in the classic OO sense of the term.method1(object) methodnstate

اسلاید ۷: Background Part 1, AbstractionClient 1ProxyService HostInstance 1Instance 2Client 2ProxyIn remote access, Client machines generally access servers through proxy objects, which expose methods similar to local objects, but actually contain communication code that makes a call to server and returns results. The proxy Looks like a local object, feels like a local object, programmer likes to think of it as a local object because that’s easy and familiar. But it isn’t really a local object, and shouldn’t be treated as one, as it is above.

اسلاید ۸: Background Part 2: StatelessnessIt is expensive and difficult to maintain the connection from proxy to a specific server-side object from one call to the next. For example, load balancing is difficult, as is lifetime management. So you generally want to design your objects so that they don’t expect their internal state to be maintained from one call to another. The proxy often stays alive on the client side, but is connected to a difference object instance on the server side on its next call.

اسلاید ۹: Background Part 2: StatelessnessClient 1ProxyService HostInstance 1Instance 2Instance 3Client 2Proxyt=0t=0t=1

اسلاید ۱۰: Background Part 2: StatelessnessThe term statelessness does not mean that no data is maintained from one call to the next. It does mean that no data is maintained in an individual object instance. Whatever data is maintained from one call to the next is maintained in some sort of storage system, so that the next object instance can pick up where the first left off.

اسلاید ۱۱: Background Part 2: StatelessnessClient 1ProxyService HostInstance 1Instance 2Instance 3Client 2Proxyt=0t=0t=1Object fetches previous state from storage when it is instantiated at the start of a call. It stores current state in storage when it is deactivated at the end of a call.

اسلاید ۱۲: Background Part 3: ChunkinessCalls to local objects are very quick, call overhead is low. In distributed system, call overhead is very much larger. Therefore, it is important to make fewer calls, with more data in each callOp