catcherinterceptors

Catcherinterceptors is a term used to describe a design pattern or framework component that attaches interceptors to exception-catching points in a program to enable centralized, reusable error handling. The idea is to separate cross-cutting error-management concerns from the core business logic by providing a pluggable chain of handlers that run when an exception is caught or is about to propagate.

Mechanism and structure typically involve a registry or chain of interceptor units. When an exception is caught, the runtime or framework invokes the configured interceptors in a defined order, allowing each to inspect, transform, log, or augment the error data before control continues. Interceptors can be invoked before or after the primary catch block, and some implementations permit wrapping around the catch or around the entire error-propagation path. Support for synchronous and asynchronous interceptors is common, as is the ability to conditionally execute based on exception type, message, or context.

Common use cases include centralized logging and metrics collection for error events, normalization or translation of diverse error formats into a consistent response, enrichment of exceptions with metadata (such as correlating IDs or user context), retry or circuit-breaking decisions, and standardization of user-facing error messages.

Design considerations include performance impact from interceptor execution, the ordering and determinism of interceptor invocation, and how to handle exceptions raised within interceptors themselves. It is important to ensure that interceptor logic does not swallow or obscure original errors, and that compatibility with existing language-specific exception handling semantics is maintained.

See also: interceptor, middleware, exception handling, aspect-oriented programming, error handling patterns.