/*
 * 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 java.net.InetSocketAddress;
import java.util.concurrent.TimeUnit;

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

import com.codahale.metrics.Counter;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.Histogram;
import com.codahale.metrics.JmxReporter;
import com.codahale.metrics.Meter;
import com.codahale.metrics.MetricFilter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
import com.codahale.metrics.graphite.Graphite;
import com.codahale.metrics.graphite.GraphiteReporter;
import com.google.inject.Inject;
import com.google.inject.Singleton;


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


    private MetricRegistry registry;
    private GraphiteReporter graphiteReporter;
    private JmxReporter jmxReporter;
    private static final Logger logger = 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("usergrid-metrics")
                .convertRatesTo(TimeUnit.SECONDS)
                .convertDurationsTo(TimeUnit.MILLISECONDS).filter(MetricFilter.ALL)
                .build(graphite);
            graphiteReporter.start(30, TimeUnit.SECONDS);
        } else {
            logger.warn("MetricsService:Logger not started.");
        }

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


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


    @Override
    public Timer getTimer(Class<?> klass, String name) {
        return getRegistry().timer(MetricRegistry.name(klass, name + ".timer"));
    }


    @Override
    public Histogram getHistogram(Class<?> klass, String name) {
        return getRegistry().histogram(MetricRegistry.name(klass, name + ".histogram"));
    }


    @Override
    public Counter getCounter(Class<?> klass, String name) {
        return getRegistry().counter(MetricRegistry.name(klass, name + ".counter"));
    }


    @Override
    public Meter getMeter(Class<?> klass, String name) {
        return getRegistry().meter(MetricRegistry.name(klass, name + ".meter"));
    }


    @Override
    public void addGauge(final Class<?> clazz, final String name, final Gauge<?> gauge) {

        this.getRegistry().register(MetricRegistry.name(clazz, name), gauge);
    }

}