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/**
 * Copyright (C) 2012 Ryan W Tenney ([email protected])
 *
 * 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;

import java.lang.reflect.Method;

import org.aopalliance.aop.Advice;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.Pointcut;
import org.springframework.aop.support.annotation.AnnotationMatchingPointcut;
import org.springframework.core.Ordered;
import org.springframework.util.ReflectionUtils.MethodFilter;

import com.codahale.metrics.Meter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.annotation.ExceptionMetered;

import static com.ryantenney.metrics.spring.AnnotationFilter.PROXYABLE_METHODS;

class ExceptionMeteredMethodInterceptor extends AbstractMetricMethodInterceptor implements Ordered {

	public static final Class ANNOTATION = ExceptionMetered.class;
	public static final Pointcut POINTCUT = new AnnotationMatchingPointcut(null, ANNOTATION);
	public static final MethodFilter METHOD_FILTER = new AnnotationFilter(ANNOTATION, PROXYABLE_METHODS);

	public ExceptionMeteredMethodInterceptor(final MetricRegistry metricRegistry, final Class targetClass) {
		super(metricRegistry, targetClass, ANNOTATION, METHOD_FILTER);
	}

	@Override
	protected Object invoke(MethodInvocation invocation, Meter meter, ExceptionMetered annotation) throws Throwable {
		try {
			return invocation.proceed();
		}
		catch (Throwable t) {
			if (annotation.cause().isAssignableFrom(t.getClass())) {
				meter.mark();
			}
			throw t;
		}
	}

	@Override
	protected Meter buildMetric(MetricRegistry metricRegistry, String metricName, ExceptionMetered annotation) {
		return metricRegistry.meter(metricName);
	}

	@Override
	protected String buildMetricName(Class targetClass, Method method, ExceptionMetered annotation) {
		return Util.forExceptionMeteredMethod(targetClass, method, annotation);
	}

	@Override
	public int getOrder() {
		return HIGHEST_PRECEDENCE;
	}

	static AdviceFactory adviceFactory(final MetricRegistry metricRegistry) {
		return new AdviceFactory() {
			@Override
			public Advice getAdvice(Object bean, Class targetClass) {
				return new ExceptionMeteredMethodInterceptor(metricRegistry, targetClass);
			}
		};
	}

}