Platform as a Service

Platform as a service delivers what can be called a _________

A _____ stack is an integrated set of software that provides everything a developer needs to build an application — for both software development and runtime

PaaS can be viewed as an evolution of ______ hosting

PaaS takes web sites development a step further

Web hosting companies have provided fairly complete software stacks for developing Web sites. PaaS takes this idea a step farther by providing _________ capabilities to manage all software development stages from planning and design, to building and deployment, to testing and maintenance

The primary benefit of PaaS is having software development and deployment capability based entirely in the __________

PaaS primary architecture

In reference to Platform as a Service, dynamic scaling means that the software can be ________ scaled up or down

Platform as a Service typically addresses the need to scale as well as the need to separate concerns of access and data security for its customers

The major drawback of Platform as a Service is that it may lock you in to the use of a particular development environment and stack of software components

Open Platform as a Service

Open Platform as a Service offers the same approach as Platform as a Service.  It is just another name and still has the same disadvantage of locking customers to a specific software stack

Examples of PaaS environments

Some examples of Platform as a Service include the Google App Engine, AppJet, Etelos, Qrimp, and Force.com, which is the official development environment for Salesforce.com. See the “Salesforce.com and automation application” sidebar elsewhere in this chapter for more on this pioneering example of Platform as a Service.