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Graphite Metrics integration
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/*
 * Copyright (C) 2014 the original author or authors.
 *
 * 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 ro.pippo.graphite;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import ro.pippo.core.PippoSettings;
import ro.pippo.metrics.MetricsReporter;

import com.codahale.metrics.MetricFilter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.graphite.Graphite;
import com.codahale.metrics.graphite.GraphiteReporter;
import com.codahale.metrics.graphite.GraphiteSender;
import com.codahale.metrics.graphite.PickledGraphite;

/**
 * Integration of Pippo Metrics with Graphite.
 *
 * @author James Moger
 *
 */
public class Reporter implements MetricsReporter {

	private final Logger log = LoggerFactory.getLogger(Reporter.class);

	private GraphiteReporter reporter;

	@Override
	public void start(PippoSettings settings, MetricRegistry metricRegistry) {
		if (settings.getBoolean("metrics.graphite.enabled", false)) {

			final String hostname = settings.getLocalHostname();
			final String address = settings.getRequiredString("metrics.graphite.address");
			final int port = settings.getInteger("metrics.graphite.port", 2003);
			final boolean isPickled = settings.getBoolean("metrics.graphite.pickled", false);
			final long period = settings.getDurationInSeconds("metrics.graphite.period", 60);

			final InetSocketAddress graphiteAddress = new InetSocketAddress(address, port);

			final GraphiteSender sender;
			if (isPickled) {
				sender = new PickledGraphite(graphiteAddress);
			} else {
				sender = new Graphite(graphiteAddress);
			}

			reporter = GraphiteReporter.forRegistry(metricRegistry).prefixedWith(hostname)
					.convertRatesTo(TimeUnit.SECONDS).convertDurationsTo(TimeUnit.MILLISECONDS)
					.filter(MetricFilter.ALL).build(sender);

			reporter.start(period, TimeUnit.SECONDS);

			log.debug("Started Graphite Metrics reporter for '{}', updating every {} seconds", hostname, period);

		} else {
			log.debug("Graphite Metrics reporter is disabled");
		}
	}

	@Override
	public void close() throws IOException {
		if (reporter != null) {

			reporter.stop();

			log.debug("Stopped Graphite Metrics reporter");
		}
	}
}