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Runtime artifact for engineblock; This module ties the core libraries, provided drivers, and API into a single executable jar
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/*
 *
 *    Copyright 2016 jshook
 *    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 io.engineblock.metrics;

import com.codahale.metrics.*;
import com.codahale.metrics.graphite.Graphite;
import com.codahale.metrics.graphite.GraphiteReporter;
import io.engineblock.activityapi.core.Shutdownable;
import io.engineblock.core.ShutdownManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.TimeUnit;

public class MetricReporters implements Shutdownable {
    private final static Logger logger = LoggerFactory.getLogger(MetricReporters.class);
    private static MetricReporters instance = new MetricReporters();

    private List metricRegistries = new ArrayList<>();
    private List scheduledReporters = new ArrayList<>();

    private MetricReporters() {
        ShutdownManager.register(this);
    }

    public static MetricReporters getInstance() {
        return instance;
    }

    public MetricReporters addRegistry(String registryPrefix, MetricRegistry metricsRegistry) {
        this.metricRegistries.add(new PrefixedRegistry(registryPrefix, metricsRegistry));
        return this;
    }

    public MetricReporters addGraphite(String dest, String prefix) {
        logger.debug("Adding graphite reporter to " + dest + " with prefix " + prefix);
        if (dest.indexOf(":")>=0) {
            String[] split = dest.split(":");
            addGraphite(split[0],Integer.valueOf(split[1]),prefix);
        } else {
            addGraphite(dest, 2003, prefix);
        }
        return this;
    }

    public void addCSVReporter(String directoryName, String prefix) {
        logger.debug("Adding CSV reporter to " + directoryName + " with prefix " + prefix);

        if (metricRegistries.isEmpty()) {
            throw new RuntimeException("There are no metric registries.");
        }

        File csvDirectory = new File(directoryName);
        if (!csvDirectory.exists()) {
            if (!csvDirectory.mkdirs()) {
                throw new RuntimeException("Error creating CSV reporting directory:" + csvDirectory.getAbsolutePath());
            }
        }

        for (PrefixedRegistry prefixedRegistry : metricRegistries) {
            CsvReporter csvReporter = CsvReporter.forRegistry(prefixedRegistry.metricRegistry)
                    .convertDurationsTo(TimeUnit.NANOSECONDS)
                    .convertRatesTo(TimeUnit.SECONDS)
                    .filter(ActivityMetrics.METRIC_FILTER)
                    .formatFor(Locale.US)
                    .build(csvDirectory);

            scheduledReporters.add(csvReporter);
        }
    }

    public MetricReporters addGraphite(String host, int graphitePort, String prefix) {

        logger.debug("Adding graphite reporter to " + host + " with port " + graphitePort + " and prefix " + prefix);

        if (metricRegistries.isEmpty()) {
            throw new RuntimeException("There are no metric registries.");
        }

        for (PrefixedRegistry prefixedRegistry : metricRegistries) {

            Graphite graphite = new Graphite(new InetSocketAddress(host, graphitePort));
            GraphiteReporter graphiteReporter = GraphiteReporter.forRegistry(prefixedRegistry.metricRegistry)
                    .prefixedWith(prefixedRegistry.prefix != null ? (!prefixedRegistry.prefix.isEmpty() ? prefix + "." + prefixedRegistry.prefix : prefix) : prefix)
                    .convertRatesTo(TimeUnit.SECONDS)
                    .convertDurationsTo(TimeUnit.NANOSECONDS)
                    .filter(ActivityMetrics.METRIC_FILTER)
                    .build(graphite);

            scheduledReporters.add(graphiteReporter);
        }
        return this;
    }

    public MetricReporters addLogger() {
        logger.debug("Adding slf4j reporter for metrics");

        if (metricRegistries.isEmpty()) {
            throw new RuntimeException("There are no metric registries.");
        }

        for (PrefixedRegistry prefixedRegistry : metricRegistries) {

            Slf4jReporter loggerReporter = Slf4jReporter.forRegistry(prefixedRegistry.metricRegistry)
                    .convertRatesTo(TimeUnit.SECONDS)
                    .convertDurationsTo(TimeUnit.NANOSECONDS)
                    .filter(ActivityMetrics.METRIC_FILTER)
                    .outputTo(logger)
                    .build();
            scheduledReporters.add(loggerReporter);
        }
        return this;
    }

    public MetricReporters start(int consoleIntervalSeconds, int remoteIntervalSeconds) {
        for (ScheduledReporter scheduledReporter : scheduledReporters) {
            logger.info("starting reporter: " + scheduledReporter);
            if (scheduledReporter instanceof ConsoleReporter) {
                scheduledReporter.start(consoleIntervalSeconds, TimeUnit.SECONDS);
            } else {
                scheduledReporter.start(remoteIntervalSeconds, TimeUnit.SECONDS);
            }
        }
        return this;
    }

    public MetricReporters stop() {
        for (ScheduledReporter scheduledReporter : scheduledReporters) {
            logger.info("stopping reporter: " + scheduledReporter);
            scheduledReporter.stop();
        }
        return this;
    }


    public MetricReporters report() {
        for (ScheduledReporter scheduledReporter : scheduledReporters) {
            logger.info("flushing reporter data: " + scheduledReporter);
            scheduledReporter.report();
        }
        return this;
    }

    public void shutdown() {
        for (ScheduledReporter reporter : scheduledReporters) {
            reporter.report();
            reporter.stop();
        }
    }

    private class PrefixedRegistry {
        public String prefix;
        public MetricRegistry metricRegistry;

        public PrefixedRegistry(String prefix, MetricRegistry metricRegistry) {
            this.prefix = prefix;
            this.metricRegistry = metricRegistry;
        }
    }
}