com.ryantenney.metrics.spring.config.AnnotationDrivenBeanDefinitionParser.java Source code

Introduction

Here is the source code for com.ryantenney.metrics.spring.config.AnnotationDrivenBeanDefinitionParser.java

Source

/*
 * 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;

import static org.springframework.beans.factory.config.BeanDefinition.ROLE_APPLICATION;
import static org.springframework.beans.factory.config.BeanDefinition.ROLE_INFRASTRUCTURE;

import org.springframework.aop.framework.ProxyConfig;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.parsing.BeanComponentDefinition;
import org.springframework.beans.factory.parsing.CompositeComponentDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.BeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.health.HealthCheckRegistry;
import com.ryantenney.metrics.spring.MetricsBeanPostProcessorFactory;

class AnnotationDrivenBeanDefinitionParser implements BeanDefinitionParser {

    @Override
    public BeanDefinition parse(Element element, ParserContext parserContext) {
        final Object source = parserContext.extractSource(element);

        final CompositeComponentDefinition compDefinition = new CompositeComponentDefinition(element.getTagName(),
                source);
        parserContext.pushContainingComponent(compDefinition);

        String metricsBeanName = element.getAttribute("metric-registry");
        if (!StringUtils.hasText(metricsBeanName)) {
            metricsBeanName = registerComponent(parserContext,
                    build(MetricRegistry.class, source, ROLE_APPLICATION));
        }

        String healthCheckBeanName = element.getAttribute("health-check-registry");
        if (!StringUtils.hasText(healthCheckBeanName)) {
            healthCheckBeanName = registerComponent(parserContext,
                    build(HealthCheckRegistry.class, source, ROLE_APPLICATION));
        }

        final ProxyConfig proxyConfig = new ProxyConfig();

        if (StringUtils.hasText(element.getAttribute("expose-proxy"))) {
            proxyConfig.setExposeProxy(Boolean.valueOf(element.getAttribute("expose-proxy")));
        }

        if (StringUtils.hasText(element.getAttribute("proxy-target-class"))) {
            proxyConfig.setProxyTargetClass(Boolean.valueOf(element.getAttribute("proxy-target-class")));
        }

        //@formatter:off

        registerComponent(parserContext,
                build(MetricsBeanPostProcessorFactory.class, source, ROLE_INFRASTRUCTURE)
                        .setFactoryMethod("exceptionMetered").addConstructorArgReference(metricsBeanName)
                        .addConstructorArgValue(proxyConfig));

        registerComponent(parserContext,
                build(MetricsBeanPostProcessorFactory.class, source, ROLE_INFRASTRUCTURE)
                        .setFactoryMethod("metered").addConstructorArgReference(metricsBeanName)
                        .addConstructorArgValue(proxyConfig));

        registerComponent(parserContext,
                build(MetricsBeanPostProcessorFactory.class, source, ROLE_INFRASTRUCTURE).setFactoryMethod("timed")
                        .addConstructorArgReference(metricsBeanName).addConstructorArgValue(proxyConfig));

        registerComponent(parserContext, build(MetricsBeanPostProcessorFactory.class, source, ROLE_INFRASTRUCTURE)
                .setFactoryMethod("gauge").addConstructorArgReference(metricsBeanName));

        registerComponent(parserContext, build(MetricsBeanPostProcessorFactory.class, source, ROLE_INFRASTRUCTURE)
                .setFactoryMethod("injectMetric").addConstructorArgReference(metricsBeanName));

        registerComponent(parserContext, build(MetricsBeanPostProcessorFactory.class, source, ROLE_INFRASTRUCTURE)
                .setFactoryMethod("healthCheck").addConstructorArgReference(healthCheckBeanName));

        //@formatter:on

        parserContext.popAndRegisterContainingComponent();

        return null;
    }

    private BeanDefinitionBuilder build(Class<?> klazz, Object source, int role) {
        final BeanDefinitionBuilder beanDefBuilder = BeanDefinitionBuilder.rootBeanDefinition(klazz);
        beanDefBuilder.setRole(role);
        beanDefBuilder.getRawBeanDefinition().setSource(source);
        return beanDefBuilder;
    }

    private String registerComponent(ParserContext parserContext, BeanDefinitionBuilder beanDefBuilder) {
        final BeanDefinition beanDef = beanDefBuilder.getBeanDefinition();
        final String beanName = parserContext.getReaderContext().registerWithGeneratedName(beanDef);
        parserContext.registerComponent(new BeanComponentDefinition(beanDef, beanName));
        return beanName;
    }

}