Java EE 8 Design Patterns and Best Practices

Explaining intercepting filter pattern

When a client sends a request to the server, the server sometimes processes this request/response to perform the following tasks:

• Validating authentication
• Generating log
• Validating constraints
• Verifying the browser of the client
• Checking the duration between the request and response; calculating the response time
• Setting a cookie

However, we don't want to put these tasks within the logic of processing the main request. Consequently, creating a pre-process and/or post-process to do these tasks is a good method for decoupling the main logic from the complementary logic.

The intercepting filter pattern is the pattern that solves problems when we want to insert a logic that is not part of the main logic ...