org.apache.commons.lang3.concurrent

Class EventCountCircuitBreaker.StateStrategy

java.lang.Object

org.apache.commons.lang3.concurrent.EventCountCircuitBreaker.StateStrategy

Direct Known Subclasses:

EventCountCircuitBreaker.StateStrategyClosed, EventCountCircuitBreaker.StateStrategyOpen

Enclosing class:

EventCountCircuitBreaker

private abstract static class EventCountCircuitBreaker.StateStrategy
extends java.lang.Object

Internally used class for executing check logic based on the current state of the circuit breaker. Having this logic extracted into special classes avoids complex if-then-else cascades.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	StateStrategy()

Method Summary

Modifier and Type	Method and Description
protected abstract long	fetchCheckInterval(EventCountCircuitBreaker breaker) Obtains the check interval to applied for the represented state from the given CircuitBreaker.
boolean	isCheckIntervalFinished(EventCountCircuitBreaker breaker, EventCountCircuitBreaker.CheckIntervalData currentData, long now) Returns a flag whether the end of the current check interval is reached.
abstract boolean	isStateTransition(EventCountCircuitBreaker breaker, EventCountCircuitBreaker.CheckIntervalData currentData, EventCountCircuitBreaker.CheckIntervalData nextData) Checks whether the specified CheckIntervalData objects indicate that a state transition should occur.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StateStrategy

private StateStrategy()

Method Detail

isCheckIntervalFinished

public boolean isCheckIntervalFinished(EventCountCircuitBreaker breaker,
                                       EventCountCircuitBreaker.CheckIntervalData currentData,
                                       long now)

Returns a flag whether the end of the current check interval is reached.

Parameters:

breaker - the CircuitBreaker

currentData - the current state object

now - the current time

Returns:

a flag whether the end of the current check interval is reached

isStateTransition

public abstract boolean isStateTransition(EventCountCircuitBreaker breaker,
                                          EventCountCircuitBreaker.CheckIntervalData currentData,
                                          EventCountCircuitBreaker.CheckIntervalData nextData)

Checks whether the specified CheckIntervalData objects indicate that a state transition should occur. Here the logic which checks for thresholds depending on the current state is implemented.

Parameters:

breaker - the CircuitBreaker

currentData - the current CheckIntervalData object

nextData - the updated CheckIntervalData object

Returns:

a flag whether a state transition should be performed

fetchCheckInterval

protected abstract long fetchCheckInterval(EventCountCircuitBreaker breaker)

Obtains the check interval to applied for the represented state from the given CircuitBreaker.

Parameters:

breaker - the CircuitBreaker

Returns:

the check interval to be applied