Instrumenters

Instrumentering is a mechanism to alter a class behavior without directly modifying it. There are two types of instrumenters in Gridgo: Execution Strategy Instrumenter and Producer Instrumenter.

Execution Strategy Instrumenters

Execution strategy instrumenters are used with gateway processors to alter their behaviors. When you attach an instrumenter to a processor, all handling will be routed to the it instead of the processor. Some examples of instrumenters might be:

• Calculate the throughput and latency of a processor via Prometheus integration.
• Apply access control going through a processor.

There are several instrumenters already available for use, e.g:

• WrappedExecutionStrategyInstrumenter: Wrap several instrumenters into a single one. Wrapped instrumenters will be executed sequentially.
• Prometheus-integration instrumenters: Integrate with Prometheus functionality. Can be used to calculate throughput and latency of a processor.

Producer Instrumenters

Producer instrumenters are used with producers to alter their behaviors. Some examples of producers instrumenters might be:

• Calculate the throughput and latency of a producer (e.g a JDBC producer)
• Add a cache layer to the producer
• Add a mockup layer to the producer