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Resilience4j is a lightweight, easy-to-use fault tolerance library designed for Java8 and functional programming

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/*
 * Copyright 2019 Mahmoud Romeh
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.github.resilience4j.retry.monitoring.endpoint;


import io.github.resilience4j.common.retry.monitoring.endpoint.RetryEventDTOFactory;
import io.github.resilience4j.common.retry.monitoring.endpoint.RetryEventsEndpointResponse;
import io.github.resilience4j.consumer.CircularEventConsumer;
import io.github.resilience4j.consumer.EventConsumerRegistry;
import io.github.resilience4j.retry.event.RetryEvent;
import io.vavr.collection.List;
import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.boot.actuate.endpoint.annotation.Selector;

import java.util.Comparator;


/**
 * rest api endpoint to retrieve retry events
 */
@Endpoint(id = "retryevents")
public class RetryEventsEndpoint {

    private final EventConsumerRegistry eventConsumerRegistry;

    public RetryEventsEndpoint(EventConsumerRegistry eventConsumerRegistry) {
        this.eventConsumerRegistry = eventConsumerRegistry;
    }

    /**
     * @return all retry generated events
     */
    @ReadOperation
    public RetryEventsEndpointResponse getAllRetryEvents() {
        return new RetryEventsEndpointResponse(eventConsumerRegistry.getAllEventConsumer()
            .flatMap(CircularEventConsumer::getBufferedEvents)
            .sorted(Comparator.comparing(RetryEvent::getCreationTime))
            .map(RetryEventDTOFactory::createRetryEventDTO).toJavaList());
    }

    /**
     * @param name backend name
     * @return the retry events generated for this backend
     */
    @ReadOperation
    public RetryEventsEndpointResponse getEventsFilteredByRetryName(@Selector String name) {
        return new RetryEventsEndpointResponse(getRetryEvents(name)
            .map(RetryEventDTOFactory::createRetryEventDTO).toJavaList());
    }

    /**
     * @param name      backend name
     * @param eventType retry event type
     * @return the matching generated retry events
     */
    @ReadOperation
    public RetryEventsEndpointResponse getEventsFilteredByRetryNameAndEventType(
        @Selector String name, @Selector String eventType) {
        return new RetryEventsEndpointResponse(getRetryEvents(name)
            .filter(
                event -> event.getEventType() == RetryEvent.Type.valueOf(eventType.toUpperCase()))
            .map(RetryEventDTOFactory::createRetryEventDTO).toJavaList());
    }

    private List getRetryEvents(String name) {
        final CircularEventConsumer syncEvents = eventConsumerRegistry
            .getEventConsumer(name);
        if (syncEvents != null) {
            return syncEvents.getBufferedEvents()
                .filter(event -> event.getName().equals(name));
        } else {
            return List.empty();
        }
    }
}