circuit-breaker-fn.primitives
cb-error-handlerclj
(cb-error-handler CBS
[fail-limit window-nanos]
[open-timeout time-unit]
ex-fn
ex)Function with which to handle errors in a circuit-breaker context. Typical usage would involve partially binding all but the last arg (the exception itself).
<CBS> - atom holding all the state required (see cb-init).
<fail-limit> - How many Exceptions (within <window-nanos>) before transitioning from CLOSED => OPEN.
<window-nanos> - Time window (in nanos) in which <fail-limit> has an effect.
<open-timeout> - How long (in <timeout-unit>) to wait before transitioning from OPEN => HALF-OPEN
<timeout-unit> - One of the keys in util/time-units (defaults to :millis).
<ex-fn> - Function of 3 args to be called last. Takes the Exception itself (do NOT rethrow),
the time it occurred (per System/nanoTime) & the current fail count.
Function with which to handle errors in a circuit-breaker context.
Typical usage would involve partially binding all but the last arg
(the exception itself).
<CBS> - atom holding all the state required (see `cb-init`).
<fail-limit> - How many Exceptions (within <window-nanos>) before transitioning from CLOSED => OPEN.
<window-nanos> - Time window (in nanos) in which <fail-limit> has an effect.
<open-timeout> - How long (in <timeout-unit>) to wait before transitioning from OPEN => HALF-OPEN
<timeout-unit> - One of the keys in `util/time-units` (defaults to `:millis`).
<ex-fn> - Function of 3 args to be called last. Takes the Exception itself (do NOT rethrow),
the time it occurred (per `System/nanoTime`) & the current fail count.cb-wrap-handlerclj
(cb-wrap-handler CBS success-limit drop-fn success-block handler)Given a <handler> fn, returns a wrapped version of it (with circuit-breaker semantics).
<CBS> - atom holding all the state required (see cb-init).
<success-limit> - How many successful calls before transitioning from HALF-OPEN => CLOSED
<drop-fn> - Function to handle all requests while in OPEN state (arg-list per <handler>).
If a default value makes sense in your domain this is your chance to use it.
<success-block> - Function (or positive integer) expected to produce an artificial delay
(via Thread/sleep) after each successful <handler> call (arg-list per <handler>).
<handler> - The underlying processing handler function.
Given a <handler> fn, returns a wrapped version
of it (with circuit-breaker semantics).
<CBS> - atom holding all the state required (see `cb-init`).
<success-limit> - How many successful calls before transitioning from HALF-OPEN => CLOSED
<drop-fn> - Function to handle all requests while in OPEN state (arg-list per <handler>).
If a default value makes sense in your domain this is your chance to use it.
<success-block> - Function (or positive integer) expected to produce an artificial delay
(via `Thread/sleep`) after each successful <handler> call (arg-list per <handler>).
<handler> - The underlying processing handler function.cljdoc is a website building & hosting documentation for Clojure/Script libraries
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