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/*
 * Copyright 2012-2022 the original author or 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
 *
 *      https://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 org.springframework.boot.actuate.autoconfigure.metrics.export.simple;

import io.micrometer.core.instrument.Clock;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.simple.SimpleConfig;
import io.micrometer.core.instrument.simple.SimpleMeterRegistry;

import org.springframework.boot.actuate.autoconfigure.metrics.CompositeMeterRegistryAutoConfiguration;
import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
import org.springframework.boot.actuate.autoconfigure.metrics.export.ConditionalOnEnabledMetricsExport;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;

/**
 * {@link EnableAutoConfiguration Auto-configuration} for exporting metrics to a
 * {@link SimpleMeterRegistry}. Auto-configured after all other {@link MeterRegistry}
 * beans and only used as a fallback.
 *
 * @author Jon Schneider
 * @since 2.0.0
 */
@AutoConfiguration(before = CompositeMeterRegistryAutoConfiguration.class, after = MetricsAutoConfiguration.class)
@ConditionalOnBean(Clock.class)
@EnableConfigurationProperties(SimpleProperties.class)
@ConditionalOnMissingBean(MeterRegistry.class)
@ConditionalOnEnabledMetricsExport("simple")
public class SimpleMetricsExportAutoConfiguration {

	@Bean
	public SimpleMeterRegistry simpleMeterRegistry(SimpleConfig config, Clock clock) {
		return new SimpleMeterRegistry(config, clock);
	}

	@Bean
	@ConditionalOnMissingBean
	public SimpleConfig simpleConfig(SimpleProperties simpleProperties) {
		return new SimplePropertiesConfigAdapter(simpleProperties);
	}

}