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| |
| package org.apache.james.jmap.api.projections; |
| |
| import static org.apache.james.jmap.api.projections.MessageFastViewProjection.METRIC_RETRIEVE_HIT_COUNT; |
| import static org.apache.james.jmap.api.projections.MessageFastViewProjection.METRIC_RETRIEVE_MISS_COUNT; |
| |
| import javax.inject.Inject; |
| |
| import org.apache.james.core.healthcheck.ComponentName; |
| import org.apache.james.core.healthcheck.HealthCheck; |
| import org.apache.james.core.healthcheck.Result; |
| import org.apache.james.metrics.api.Metric; |
| import org.apache.james.metrics.api.MetricFactory; |
| |
| import reactor.core.publisher.Mono; |
| |
| public class MessageFastViewProjectionHealthCheck implements HealthCheck { |
| |
| private static final ComponentName COMPONENT_NAME = new ComponentName("MessageFastViewProjection"); |
| private static final double MAXIMUM_MISS_PERCENTAGE_ACCEPTED = 10; |
| |
| private final Metric retrieveHitCountMetric; |
| private final Metric retrieveMissCountMetric; |
| |
| @Inject |
| MessageFastViewProjectionHealthCheck(MetricFactory metricFactory) { |
| retrieveHitCountMetric = metricFactory.generate(METRIC_RETRIEVE_HIT_COUNT); |
| retrieveMissCountMetric = metricFactory.generate(METRIC_RETRIEVE_MISS_COUNT); |
| } |
| |
| @Override |
| public ComponentName componentName() { |
| return COMPONENT_NAME; |
| } |
| |
| @Override |
| public Mono<Result> check() { |
| return Mono.fromCallable(retrieveMissCountMetric::movingAverage) |
| .flatMap(missCount -> { |
| if (missCount == 0) { |
| return Mono.just(Result.healthy(COMPONENT_NAME)); |
| } else { |
| return Mono.fromCallable(retrieveHitCountMetric::movingAverage) |
| .map(hitCount -> check(hitCount, missCount)); |
| } |
| }); |
| } |
| |
| private Result check(double hitAverage, double missAverage) { |
| double total = hitAverage + missAverage; |
| double missPercentage = missAverage * 100.0d / total; |
| |
| if (missPercentage > MAXIMUM_MISS_PERCENTAGE_ACCEPTED) { |
| return Result.degraded(COMPONENT_NAME, |
| String.format("Miss percentage %.2f%% (%.0f/%.0f) is higher than the threshold %.0f%%", |
| missPercentage, missAverage, total, MAXIMUM_MISS_PERCENTAGE_ACCEPTED)); |
| } |
| |
| return Result.healthy(COMPONENT_NAME); |
| } |
| } |