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Cassandra library for Dropwizard
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/*
 * Copyright 2016 Composable Systems Limited
 *
 *    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 systems.composable.dropwizard.cassandra;

import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricSet;
import com.datastax.driver.core.Cluster;
import com.google.common.collect.ImmutableMap;

import java.util.Map;

import static com.codahale.metrics.MetricRegistry.name;

/**
 * Exposes the metrics provided by the provided Cluster, embedding the cluster name in the metric name.
 * 
 * Metrics are named based on the DataStax {@link Cluster} class, the cluster name, and the original name of the metric
 * exposed by the driver. With the current version of the driver - v2.0.2 at the time of writing - this includes:
 *
 * Counters:
 * 

 *     com.datastax.core.Cluster.clusterName.connection-errors
 *     com.datastax.core.Cluster.clusterName.write-timeouts
 *     com.datastax.core.Cluster.clusterName.read-timeouts
 *     com.datastax.core.Cluster.clusterName.unavailables
 *     com.datastax.core.Cluster.clusterName.other-errors
 *     com.datastax.core.Cluster.clusterName.retries
 *     com.datastax.core.Cluster.clusterName.ignores
 * 
 *
 * Gauges:
 * 
 *     com.datastax.core.Cluster.clusterName.open-connections
 *     com.datastax.core.Cluster.clusterName.connected-to
 *     com.datastax.core.Cluster.clusterName.known-hosts
 * 
 *
 * Timers:
 * 
 *     com.datastax.core.Cluster.clusterName.requests
 * 
 */
public class CassandraMetricSet implements MetricSet {

    private Map metrics;

    public CassandraMetricSet(Cluster cluster) {
        final String clusterName = cluster.getClusterName();
        Map driverMetrics = cluster.getMetrics().getRegistry().getMetrics();
        ImmutableMap.Builder builder = ImmutableMap.builder();
        driverMetrics.forEach((k, v) -> builder.put(name(Cluster.class, clusterName, k), v));
        metrics = builder.build();
    }

    @Override
    public Map getMetrics() {
        return metrics;
    }
}