Patterns Refactored for the Cloud
By jasoncatsun on Feb 18, 2009
How does this apply today? This structure forms the model on how this complex state machine operartes. At each level, there is different data required to solve for the dependencies. At the high level, implementation is far removed. Today, IT folks manage “images” -- binary blobs that represent so many things that they are difficult to control and decompose. Advanced developers deploy using OSGI. This is the difference that needs to be explored.
Images are a deployment payload
Models are the structures defined by the system
APIs and “Instruction sets” define tell the system how to operate at run-time
Policy help defines the “what” happens when and are in play even prior to run-time
Views are consistent – ie what a developer sees is different but is in the model such that an admin can see what's going on in the environment as necessary. An operator can “destroy” which effects the developer “view” should it be necessary.