Hands-On Design Patterns with Java

Controlled failure

The next diagram shows a change to our auto dealer information system architecture. We moved the Payment Gateway API to be subordinate to Parts Procurement and Service Orders components, which are now labeled Local Services. Both of those services are no longer halted when the Payment Gateway is offline:

Failure-handling—good isolation example

Now that our structure is aligned for better isolation, we can control the failure. We will demonstrate this in a single ControlledFailure class. That class is provided next in three sections. The first section contains the checkStatus() method. This method checks to see whether a ...