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| |
| package org.apache.james.events; |
| |
| import javax.inject.Inject; |
| |
| import org.apache.james.backends.rabbitmq.RabbitMQConfiguration; |
| import org.apache.james.backends.rabbitmq.RabbitMQManagementAPI; |
| import org.apache.james.core.healthcheck.ComponentName; |
| import org.apache.james.core.healthcheck.HealthCheck; |
| import org.apache.james.core.healthcheck.Result; |
| |
| import reactor.core.publisher.Mono; |
| import reactor.core.scheduler.Schedulers; |
| |
| public class RabbitMQMailboxEventBusDeadLetterQueueHealthCheck implements HealthCheck { |
| public static final ComponentName COMPONENT_NAME = new ComponentName("RabbitMQMailboxEventBusDeadLetterQueueHealthCheck"); |
| private static final String DEFAULT_VHOST = "/"; |
| |
| private final RabbitMQConfiguration configuration; |
| private final NamingStrategy mailboxEventNamingStrategy; |
| private final RabbitMQManagementAPI api; |
| |
| @Inject |
| public RabbitMQMailboxEventBusDeadLetterQueueHealthCheck(RabbitMQConfiguration configuration, NamingStrategy mailboxEventNamingStrategy) { |
| this.configuration = configuration; |
| this.mailboxEventNamingStrategy = mailboxEventNamingStrategy; |
| this.api = RabbitMQManagementAPI.from(configuration); |
| } |
| |
| @Override |
| public ComponentName componentName() { |
| return COMPONENT_NAME; |
| } |
| |
| @Override |
| public Mono<Result> check() { |
| return Mono.fromCallable(() -> api.queueDetails(configuration.getVhost().orElse(DEFAULT_VHOST), mailboxEventNamingStrategy.deadLetterQueue().getName()).getQueueLength()) |
| .map(queueSize -> { |
| if (queueSize != 0) { |
| return Result.degraded(COMPONENT_NAME, "RabbitMQ dead letter queue of the mailbox event bus contain events. This might indicate transient failure on event processing."); |
| } |
| return Result.healthy(COMPONENT_NAME); |
| }) |
| .onErrorResume(e -> Mono.just(Result.unhealthy(COMPONENT_NAME, "Error checking RabbitMQMailboxEventBusDeadLetterQueueHealthCheck", e))) |
| .subscribeOn(Schedulers.boundedElastic()); // Reading the management API is blocking |
| } |
| } |