/**
* Copyright (C) 2012 Ryan W Tenney (ryan@10e.us)
*
* 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 java.util.List;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConstructorArgumentValues;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.parsing.BeanComponentDefinition;
import org.springframework.beans.factory.parsing.CompositeComponentDefinition;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.beans.factory.xml.BeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.util.StringUtils;
import org.springframework.util.xml.DomUtils;
import org.w3c.dom.Element;
import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.MetricSet;
import static com.ryantenney.metrics.spring.config.MetricsNamespaceHandler.METRICS_NAMESPACE;
class RegisterMetricBeanDefinitionParser implements BeanDefinitionParser {
@Override
public BeanDefinition parse(Element element, ParserContext parserContext) {
final CompositeComponentDefinition compDefinition = new CompositeComponentDefinition(element.getTagName(), parserContext.extractSource(element));
parserContext.pushContainingComponent(compDefinition);
final String metricRegistryBeanName = element.getAttribute("metric-registry");
if (!StringUtils.hasText(metricRegistryBeanName)) {
throw new RuntimeException(); // TODO
}
final RuntimeBeanReference metricRegistryBeanRef = new RuntimeBeanReference(metricRegistryBeanName);
final List<Element> metricElements = DomUtils.getChildElementsByTagName(element, new String[] { "bean", "ref" });
for (Element metricElement : metricElements) {
// Get the name attribute and remove it (to prevent Spring from looking for a BeanDefinitionDecorator)
final String name = metricElement.getAttributeNS(METRICS_NAMESPACE, "name");
if (name != null) {
metricElement.removeAttributeNS(METRICS_NAMESPACE, "name");
}
final Object metric = parserContext.getDelegate().parsePropertySubElement(metricElement, null);
final RootBeanDefinition metricRegistererDef = new RootBeanDefinition(MetricRegisterer.class);
metricRegistererDef.setSource(parserContext.extractSource(metricElement));
metricRegistererDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
final ConstructorArgumentValues args = metricRegistererDef.getConstructorArgumentValues();
args.addIndexedArgumentValue(0, metricRegistryBeanRef);
args.addIndexedArgumentValue(1, name);
args.addIndexedArgumentValue(2, metric);
final String beanName = parserContext.getReaderContext().registerWithGeneratedName(metricRegistererDef);
parserContext.registerComponent(new BeanComponentDefinition(metricRegistererDef, beanName));
}
parserContext.popAndRegisterContainingComponent();
return null;
}
public static class MetricRegisterer implements InitializingBean {
private final MetricRegistry metricRegistry;
private final String name;
private final Metric metric;
public MetricRegisterer(MetricRegistry metricRegistry, String name, Metric metric) {
this.metricRegistry = metricRegistry;
this.name = name;
this.metric = metric;
if (!StringUtils.hasText(name) && !(metric instanceof MetricSet)) {
throw new RuntimeException(); // TODO
}
}
@Override
public void afterPropertiesSet() throws Exception {
metricRegistry.register(name, metric);
}
}
}