com.ryantenney.metrics.spring.config.annotation.MetricsConfigurerAdapter Maven / Gradle / Ivy

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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.config.annotation;

import java.io.Closeable;
import java.util.HashSet;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.health.HealthCheckRegistry;

/**
 * An implementation of {@link MetricsConfigurer} with empty methods allowing
 * sub-classes to override only the methods they're interested in.
 *
 * @see EnableMetrics
 * @see MetricsConfigurer
 * @author Ryan Tenney
 * @since 3.0
 */
public abstract class MetricsConfigurerAdapter implements MetricsConfigurer, DisposableBean {

	private static final Logger LOG = LoggerFactory.getLogger(MetricsConfigurerAdapter.class);

	private Set reporters;

	/**
	 * {@inheritDoc}
	 * This implementation is empty.
	 */
	@Override
	public void configureReporters(MetricRegistry metricRegistry) {}

	/**
	 * {@inheritDoc}
	 * 
This implementation returns {@code null}.
	 */
	@Override
	public MetricRegistry getMetricRegistry() {
		return null;
	}

	/**
	 * {@inheritDoc}
	 * This implementation returns {@code null}.
	 */
	@Override
	public HealthCheckRegistry getHealthCheckRegistry() {
		return null;
	}

	/**
	 * Called when the Spring context is closed, this method stops reporters.
	 */
	@Override
	public void destroy() throws Exception {
		if (this.reporters != null) {
			for (Closeable reporter : this.reporters) {
				try {
					reporter.close();
				}
				catch (Exception ex) {
					LOG.warn("Problem stopping reporter", ex);
				}
			}
		}
	}

	/**
	 * Registers a reporter for destruction on Spring context close
	 * @param reporter a reporter which implements Closeable
	 * @return the reporter
	 */
	protected  R registerReporter(final R reporter) {
		if (this.reporters == null) {
			this.reporters = new HashSet();
		}
		this.reporters.add(reporter);
		return reporter;
	}

}