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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 2017 Robert Winkler
 *
 * 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.circuitbreaker.autoconfigure;

import io.github.resilience4j.circuitbreaker.CircuitBreaker;
import io.github.resilience4j.circuitbreaker.CircuitBreakerRegistry;
import io.github.resilience4j.micrometer.tagged.TaggedCircuitBreakerMetrics;
import io.github.resilience4j.micrometer.tagged.TaggedCircuitBreakerMetricsPublisher;
import io.micrometer.core.instrument.MeterRegistry;
import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
import org.springframework.boot.actuate.autoconfigure.metrics.export.simple.SimpleMetricsExportAutoConfiguration;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * {@link org.springframework.boot.autoconfigure.EnableAutoConfiguration Auto-configuration} for
 * resilience4j-metrics.
 */
@Configuration
@ConditionalOnClass({MeterRegistry.class, CircuitBreaker.class,
    TaggedCircuitBreakerMetricsPublisher.class})
@AutoConfigureAfter({MetricsAutoConfiguration.class, SimpleMetricsExportAutoConfiguration.class})
@ConditionalOnProperty(value = "resilience4j.circuitbreaker.metrics.enabled", matchIfMissing = true)
public class CircuitBreakerMetricsAutoConfiguration {

    @Bean
    @ConditionalOnProperty(value = "resilience4j.circuitbreaker.metrics.legacy.enabled", havingValue = "true")
    @ConditionalOnMissingBean
    public TaggedCircuitBreakerMetrics registerCircuitBreakerMetrics(
        CircuitBreakerRegistry circuitBreakerRegistry) {
        return TaggedCircuitBreakerMetrics.ofCircuitBreakerRegistry(circuitBreakerRegistry);
    }

    @Bean
    @ConditionalOnBean(MeterRegistry.class)
    @ConditionalOnProperty(value = "resilience4j.circuitbreaker.metrics.legacy.enabled", havingValue = "false", matchIfMissing = true)
    @ConditionalOnMissingBean
    public TaggedCircuitBreakerMetricsPublisher taggedCircuitBreakerMetricsPublisher(
        MeterRegistry meterRegistry) {
        return new TaggedCircuitBreakerMetricsPublisher(meterRegistry);
    }

}