Package io.servicetalk.traffic.resilience.http

Interface TrafficResiliencyObserver

public interface TrafficResiliencyObserver

A TrafficResilienceHttpServiceFilter or TrafficResilienceHttpClientFilter observer. Tracks interactions with CapacityLimiters and/or CircuitBreakers, and exposes a transactional TrafficResiliencyObserver.TicketObserver for each request that was let-through.

Note: All interactions with callbacks in the file below, are executed within the flow of each request, and are expected to be **non-blocking**. Any blocking calls within the implementation may impact negatively the performance of your application.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	TrafficResiliencyObserver.TicketObserver	Transactional observer for the requests that were let-through.

Method Summary

Modifier and Type	Method	Description
TrafficResiliencyObserver.TicketObserver	onAllowedThrough(StreamingHttpRequest request, CapacityLimiter.LimiterState state)	Called when a request was let through.
void	onRejectedLimit(StreamingHttpRequest request, String capacityLimiter, ContextMap meta, Classification classification)	Called when a request was "hard-rejected" due to a CapacityLimiter reaching its limit.
void	onRejectedOpenCircuit(StreamingHttpRequest request, String circuitBreaker, ContextMap meta, Classification classification)	Called when a request was "hard-rejected" due to a CircuitBreaker open state.
void	onRejectedUnmatchedPartition(StreamingHttpRequest request)	Called when a request was "soft-rejected" due to unmatched partition.

Method Details

onRejectedUnmatchedPartition

void onRejectedUnmatchedPartition(StreamingHttpRequest request)

Called when a request was "soft-rejected" due to unmatched partition. Note: The decision of whether the request was let through or rejected depends on the configuration of the filter.

Parameters:

request - the StreamingHttpRequest correlating to this rejection.

onRejectedLimit

void onRejectedLimit(StreamingHttpRequest request,
 String capacityLimiter,
 ContextMap meta,
 Classification classification)

Called when a request was "hard-rejected" due to a CapacityLimiter reaching its limit.

Parameters:

request - the StreamingHttpRequest correlates to this rejection.

capacityLimiter - the CapacityLimiter's name that correlates to this traffic flow.

meta - the ContextMap that correlates to this request (if any).

classification - the Classification that correlates to this request (if any).

onRejectedOpenCircuit

void onRejectedOpenCircuit(StreamingHttpRequest request,
 String circuitBreaker,
 ContextMap meta,
 Classification classification)

Called when a request was "hard-rejected" due to a CircuitBreaker open state.

Parameters:

request - the StreamingHttpRequest correlates to this rejection.

circuitBreaker - the CircuitBreaker's name that correlates to this traffic flow.

meta - the ContextMap that correlates to this request (if any).

classification - the Classification that correlates to this request (if any).

onAllowedThrough

TrafficResiliencyObserver.TicketObserver onAllowedThrough(StreamingHttpRequest request,
 CapacityLimiter.LimiterState state)

Called when a request was let through.

Parameters:

request - the StreamingHttpRequest correlates to this rejection.

state - the CapacityLimiter.LimiterState that correlates to this accepted request.

Returns:

A TrafficResiliencyObserver.TicketObserver to track the state of the allowed request.