/**
* We should update if we have no prior state, or the state's generation id is older than the
* current cluster generation, or the state was last updated more than _updateIntervalMs ago.
*
* <p>Now requiring shouldUpdate to take a DegraderLoadBalancerState because we must have a static
* view of the state, and we don't want the state to change between checking if we should update
* and actually updating.
*
* @param clusterGenerationId The cluster generation for a set of tracker clients
* @param currentState Current DegraderLoadBalancerState
* @param config Current DegraderLoadBalancerStrategyConfig
* @param updateEnabled Whether updates to the strategy state is allowed.
* @return True if we should update, and false otherwise.
*/
protected static boolean shouldUpdate(
long clusterGenerationId,
DegraderLoadBalancerState currentState,
DegraderLoadBalancerStrategyConfig config,
boolean updateEnabled) {
return updateEnabled
&& (((currentState.getClusterGenerationId() != clusterGenerationId
|| config.getClock().currentTimeMillis() - currentState.getLastUpdated()
>= config.getUpdateIntervalMs()
|| currentState.getClusterGenerationId() == -1)));
}
// for unit testing, this allows the strategy to be forced for the next time updateState
// is called. This is not to be used in prod code.
void setStrategy(DegraderLoadBalancerState.Strategy strategy) {
DegraderLoadBalancerState newState;
newState =
new DegraderLoadBalancerState(
_state.getUpdateIntervalMs(),
_state.getClusterGenerationId(),
_state.getPointsMap(),
_state.getLastUpdated(),
strategy,
_state.getCurrentOverrideDropRate(),
_state.getCurrentAvgClusterLatency(),
_state.isInitialized(),
_state.getRecoveryMap(),
_state.getServiceName(),
_state.getDegraderProperties(),
_state.getCurrentClusterCallCount());
_state = newState;
}