stack/corepersistence/common/src/main/java/org/apache/usergrid/persistence/core/metrics/MetricsFactoryImpl.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.usergrid.persistence.core.metrics;


import com.codahale.metrics.*;
import com.codahale.metrics.graphite.Graphite;
import com.codahale.metrics.graphite.GraphiteReporter;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.InetSocketAddress;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;

/**
 * Singleton class to manage metrics.
 */
@Singleton
public class MetricsFactoryImpl implements MetricsFactory {


    private MetricRegistry registry;
    private GraphiteReporter graphiteReporter;
    private JmxReporter jmxReporter;
    private ConcurrentHashMap<String,Metric> hashMap;
    private static final Logger LOG = LoggerFactory.getLogger(MetricsFactoryImpl.class);

    @Inject
    public MetricsFactoryImpl(MetricsFig metricsFig) {
        registry = new MetricRegistry();
        String metricsHost = metricsFig.getHost();
        if(!metricsHost.equals("false")) {
            Graphite graphite = new Graphite(new InetSocketAddress(metricsHost, 2003));
            graphiteReporter = GraphiteReporter.forRegistry(registry)
                    .prefixedWith("notifications")
                    .convertRatesTo(TimeUnit.SECONDS)
                    .convertDurationsTo(TimeUnit.MILLISECONDS)
                    .filter(MetricFilter.ALL)
                    .build(graphite);
            graphiteReporter.start(30, TimeUnit.SECONDS);
        }else {
            LOG.warn("MetricsService:Logger not started.");
        }
        hashMap = new ConcurrentHashMap<String, Metric>();

        jmxReporter = JmxReporter.forRegistry(registry).build();
        jmxReporter.start();
    }

    @Override
    public MetricRegistry getRegistry() {
        return registry;
    }

    @Override
    public Timer getTimer(Class<?> klass, String name) {
        return getMetric(Timer.class, klass, name);
    }

    @Override
    public Histogram getHistogram(Class<?> klass, String name) {
        return getMetric(Histogram.class, klass, name);
    }

    @Override
    public Counter getCounter(Class<?> klass, String name) {
        return getMetric(Counter.class, klass, name);
    }

    @Override
    public Meter getMeter(Class<?> klass, String name) {
        return getMetric(Meter.class, klass, name);
    }

    private <T> T getMetric(Class<T> metricClass, Class<?> klass, String name) {
        String key = metricClass.getName() + klass.getName() + name;
        Metric metric = hashMap.get(key);
        if (metric == null) {
            if (metricClass == Histogram.class) {
                metric = this.getRegistry().histogram(MetricRegistry.name(klass, name));
            }
            if (metricClass == Timer.class) {
                metric = this.getRegistry().timer(MetricRegistry.name(klass, name));
            }
            if (metricClass == Meter.class) {
                metric = this.getRegistry().meter(MetricRegistry.name(klass, name));
            }
            if (metricClass == Counter.class) {
                metric = this.getRegistry().counter(MetricRegistry.name(klass, name));
            }
            hashMap.put(key, metric);
        }
        return (T) metric;
    }
}