io.micronaut.retry.intercept.DefaultRetryInterceptor Maven / Gradle / Ivy

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/*
 * Copyright 2017-2019 original authors
 *
 * 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.micronaut.retry.intercept;

import io.micronaut.aop.InterceptPhase;
import io.micronaut.aop.MethodInterceptor;
import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.context.event.ApplicationEventPublisher;
import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.core.async.publisher.Publishers;
import io.micronaut.core.convert.ConversionService;
import io.micronaut.core.convert.value.MutableConvertibleValues;
import io.micronaut.core.type.ReturnType;
import io.micronaut.inject.ExecutableMethod;
import io.micronaut.retry.RetryState;
import io.micronaut.retry.annotation.CircuitBreaker;
import io.micronaut.retry.annotation.Retryable;
import io.micronaut.retry.event.RetryEvent;
import io.micronaut.scheduling.TaskExecutors;
import io.micronaut.scheduling.executor.ExecutorType;
import io.micronaut.scheduling.executor.UserExecutorConfiguration;
import io.reactivex.Flowable;
import io.reactivex.functions.Function;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;
import java.time.Duration;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.*;
import java.util.function.BiConsumer;

/**
 * A {@link MethodInterceptor} that retries an operation according to the specified
 * {@link Retryable} annotation.
 *
 * @author graemerocher
 * @since 1.0
 */
@Singleton
public class DefaultRetryInterceptor implements MethodInterceptor {

    private static final Logger LOG = LoggerFactory.getLogger(DefaultRetryInterceptor.class);
    private static final int DEFAULT_CIRCUIT_BREAKER_TIMEOUT_IN_MILLIS = 20;

    private final ApplicationEventPublisher eventPublisher;
    private final ScheduledExecutorService executorService;
    private final Map circuitContexts = new ConcurrentHashMap<>();

    /**
     * Construct a default retry method interceptor with the event publisher.
     *
     * @param eventPublisher The event publisher to publish retry events
     * @deprecated Use {@link #DefaultRetryInterceptor(ApplicationEventPublisher, ExecutorService)} instead
     */
    @Deprecated
    public DefaultRetryInterceptor(ApplicationEventPublisher eventPublisher) {
        this.eventPublisher = eventPublisher;
        UserExecutorConfiguration configuration = UserExecutorConfiguration.of(ExecutorType.SCHEDULED);
        this.executorService = Executors.newScheduledThreadPool(configuration.getCorePoolSize());
    }

    /**
     * Construct a default retry method interceptor with the event publisher.
     *
     * @param eventPublisher The event publisher to publish retry events
     * @param executorService The executor service to use for completable futures
     */
    @Inject
    public DefaultRetryInterceptor(ApplicationEventPublisher eventPublisher, @Named(TaskExecutors.SCHEDULED) ExecutorService executorService) {
        this.eventPublisher = eventPublisher;
        this.executorService = (ScheduledExecutorService) executorService;
    }

    @Override
    public int getOrder() {
        return InterceptPhase.RETRY.getPosition();
    }

    @Override
    public Object intercept(MethodInvocationContext context) {
        Optional> opt = context.findAnnotation(Retryable.class);
        if (!opt.isPresent()) {
            return context.proceed();
        }

        AnnotationValue retry = opt.get();
        boolean isCircuitBreaker = context.hasStereotype(CircuitBreaker.class);
        MutableRetryState retryState;
        AnnotationRetryStateBuilder retryStateBuilder = new AnnotationRetryStateBuilder(
            context
        );

        if (isCircuitBreaker) {
            long timeout = context
                .getValue(CircuitBreaker.class, "reset", Duration.class)
                .map(Duration::toMillis).orElse(Duration.ofSeconds(DEFAULT_CIRCUIT_BREAKER_TIMEOUT_IN_MILLIS).toMillis());
            retryState = circuitContexts.computeIfAbsent(
                context.getExecutableMethod(),
                method -> new CircuitBreakerRetry(timeout, retryStateBuilder, context, eventPublisher)
            );
        } else {
            retryState = (MutableRetryState) retryStateBuilder.build();
        }

        MutableConvertibleValues