Circuit breaker design pattern: Difference between revisions

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=== Closed state ===

[[File:Circuit Breaker -Closed state.png|thumb|Circuit Breaker Closed Statestate]]

When everything is normal, the circuit breakers remainedremain ''closed'', and all the requestrequests passespass through to the services as shown below. If the number of failures increases beyond the threshold, the circuit breaker trips and goes into an ''open'' state.

[[File:Circuit Breaker -Closed state.png|thumb|Circuit Breaker Closed State]]

{{clear}}

=== Open state ===

[[File:Circuit Breaker -Openstate.png|thumb|Circuit Breaker Open Statestate]]

In this state circuit breaker returns an error immediately without even invoking the services. The Circuit breakers move into the ''half-open'' state after a timeout period elapses. Usually, it will have a monitoring system where the timeout will be specified.

[[File:Circuit Breaker -Openstate.png|thumb|Circuit Breaker Open State]]

{{clear}}

=== Half-open state ===

[[File:Circuit Breaker -Half Open state.png|thumb|Circuit Breaker Half-open Open Statestate]]

In this state, the circuit breaker allows a limited number of requests from the service to pass through and invoke the operation. If the requests are successful, then the circuit breaker will go to the ''closed'' state. However, if the requests continue to fail, then it goes back to Open''open'' state.

[[File:Circuit Breaker -Half Open state.png|thumb|Circuit Breaker Half Open State]]

==References==