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Encoder QR Code in VS .NET Infrastructure Platform Services Applications

Infrastructure Platform Services Applications
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Figure 1.6 Cloud technologies are evolving as various vendors attempt to provide services populating the cloud ecosystem. These services run the gamut from the hardware systems used to build cloud infrastructure to integration services and cloud-based applications. Source: Peter Laird, http://peterlaird.blogspot.com.
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Infrastructure as a Service (laaS) Environment for building a native application
Figure 1.7 In the X-as-a-Service taxonomy, cloud services are classified by the level of prepackaging offered to the consumer of the specific service. An IaaS provides computing capabilities in the rawest form and hence offers the greatest flexibility. At the highest layers, there is less flexibility but also less complexity to be managed.
What does XaaS mean generically It means on demand, requiring little or no capital expenditure. It means consumable remotely and across any mode of access over the internet, and in a metered billing model. Let s now go through the boxes representing the different classes of clouds in figure 1.7. First up is IaaS.
Infrastructure as a Service (IaaS)
The lowest level of XaaS is known as IaaS, or sometimes as Hardware as a Service (HaaS). A good example of IaaS is the Amazon Elastic Compute Cloud (EC2). A user of IaaS is operating at the lowest level of granularity available and with the least amount of prepackaged functionality. An IaaS provider supplies virtual machine images of different operating system flavors. These images can be tailored by the developer to run any custom or packaged application. These applications can run natively on the chosen OS and can be saved for a particular purpose. The user can bring online and use instances of these virtual machine images when needed. Use of these images is typically metered and charged in hour-long increments. Storage and bandwidth are also consumable commodities in an IaaS environment, with storage typically charged per gigabyte per month and bandwidth charged for transit into and out of the system. IaaS provides great flexibility and control over the cloud resources being consumed, but typically more work is required of the developer to operate effectively in the environment. In chapter 2, we ll delve into IaaS and see how it works in greater detail.
What is cloud computing
Platform as a Service (PaaS)
PaaS s fundamental billing quantities are somewhat similar to those of IaaS: consumption of CPU, bandwidth, and storage operates under similar models. Examples of PaaS include Google AppEngine and Microsoft Azure. The main difference is that PaaS requires less interaction with the bare metal of the system. You don t need to directly interact with or administer the virtual OSs. Instead, you can let the platform abstract away that interaction and concentrate specifically on writing the application. This simplification generally comes at the cost of less flexibility and the requirement to code in the specific languages supported by the particular PaaS provider.
Software as a Service (SaaS) and Framework as a Service (FaaS)
SaaS, as described earlier in the chapter, refers to services and applications that are available on an on-demand basis. Salesforce.com is an example. FaaS is an environment adjunct to a SaaS offering and allows developers to extend the prebuilt functionality of the SaaS applications. Force.com is an example of a FaaS that extends the Salesforce.com SaaS offering. FaaS offerings are useful specifically for augmenting and enhancing the capabilities of the base SaaS system. You can use FaaS for creating either custom, specialized applications for a specific organization, or general-purpose applications that can be made available to any customer of the SaaS offering. Like a PaaS environment, a developer in a FaaS environment can only use the specific languages and APIs provided by the FaaS.
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