Java tutorial
/* * Copyright 2012 Ryan W Tenney (http://ryan.10e.us) * and Martello Technologies (http://martellotech.com) * * 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 com.ryantenney.metrics.spring.config.annotation; import org.springframework.aop.framework.ProxyConfig; import org.springframework.beans.factory.config.BeanDefinition; import org.springframework.beans.factory.config.BeanPostProcessor; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ImportAware; import org.springframework.context.annotation.Role; import org.springframework.core.annotation.AnnotationAttributes; import org.springframework.core.type.AnnotationMetadata; import org.springframework.util.Assert; import com.codahale.metrics.MetricRegistry; import com.codahale.metrics.health.HealthCheckRegistry; import com.ryantenney.metrics.spring.MetricsBeanPostProcessorFactory; /** * This is the main class providing the configuration behind the Metrics Java config. * It is typically imported by adding {@link EnableMetrics @EnableMetrics} to an * application {@link Configuration @Configuration} class. * * @see MetricsConfigurer * @see MetricsConfigurerAdapter * @author Ryan Tenney * @since 3.0 */ public class MetricsConfigurationSupport implements ImportAware { private final Object lock = new Object(); private volatile MetricRegistry metricRegistry; private volatile HealthCheckRegistry healthCheckRegistry; private ProxyConfig proxyConfig; @Override public void setImportMetadata(AnnotationMetadata importMetadata) { final AnnotationAttributes enableMetrics = AnnotationAttributes .fromMap(importMetadata.getAnnotationAttributes(EnableMetrics.class.getName(), false)); Assert.notNull(enableMetrics, "@" + EnableMetrics.class.getSimpleName() + " is not present on importing class " + importMetadata.getClassName()); this.proxyConfig = new ProxyConfig(); this.proxyConfig.setExposeProxy(enableMetrics.getBoolean("exposeProxy")); this.proxyConfig.setProxyTargetClass(enableMetrics.getBoolean("proxyTargetClass")); } @Bean @Role(BeanDefinition.ROLE_INFRASTRUCTURE) public BeanPostProcessor exceptionMeteredAnnotationBeanPostProcessor() { return MetricsBeanPostProcessorFactory.exceptionMetered(getMetricRegistry(), proxyConfig); } @Bean @Role(BeanDefinition.ROLE_INFRASTRUCTURE) public BeanPostProcessor meteredAnnotationBeanPostProcessor() { return MetricsBeanPostProcessorFactory.metered(getMetricRegistry(), proxyConfig); } @Bean @Role(BeanDefinition.ROLE_INFRASTRUCTURE) public BeanPostProcessor timedAnnotationBeanPostProcessor() { return MetricsBeanPostProcessorFactory.timed(getMetricRegistry(), proxyConfig); } @Bean @Role(BeanDefinition.ROLE_INFRASTRUCTURE) public BeanPostProcessor gaugeAnnotationBeanPostProcessor() { return MetricsBeanPostProcessorFactory.gauge(getMetricRegistry()); } @Bean @Role(BeanDefinition.ROLE_INFRASTRUCTURE) public BeanPostProcessor injectMetricAnnotationBeanPostProcessor() { return MetricsBeanPostProcessorFactory.injectMetric(getMetricRegistry()); } @Bean @Role(BeanDefinition.ROLE_INFRASTRUCTURE) public BeanPostProcessor healthCheckBeanPostProcessor() { return MetricsBeanPostProcessorFactory.healthCheck(getHealthCheckRegistry()); } protected MetricRegistry getMetricRegistry() { if (metricRegistry == null) { synchronized (lock) { if (metricRegistry == null) { metricRegistry = new MetricRegistry(); } } } return metricRegistry; } protected HealthCheckRegistry getHealthCheckRegistry() { if (healthCheckRegistry == null) { synchronized (lock) { if (healthCheckRegistry == null) { healthCheckRegistry = new HealthCheckRegistry(); } } } return healthCheckRegistry; } protected void configureMetricsReporters(MetricRegistry metricsRegistry) { } }