org.apache.omid.metrics.MetricsRegistryMap Maven / Gradle / Ivy

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/*
 * 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.omid.metrics;

import com.google.common.base.Optional;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

public class MetricsRegistryMap {

    private final ConcurrentMap metrics = new ConcurrentHashMap<>();

    interface MetricBuilder {

        MetricBuilder> GAUGES = new MetricBuilder>() {
            @Override
            public boolean isInstance(Metric metric) {
                return Gauge.class.isInstance(metric);
            }
        };

        MetricBuilder COUNTERS = new MetricBuilder() {
            @Override
            public boolean isInstance(Metric metric) {
                return Counter.class.isInstance(metric);
            }
        };

        MetricBuilder TIMERS = new MetricBuilder() {
            @Override
            public boolean isInstance(Metric metric) {
                return Timer.class.isInstance(metric);
            }
        };

        MetricBuilder METERS = new MetricBuilder() {
            @Override
            public boolean isInstance(Metric metric) {
                return Meter.class.isInstance(metric);
            }
        };

        MetricBuilder HISTOGRAMS = new MetricBuilder() {
            @Override
            public boolean isInstance(Metric metric) {
                return Histogram.class.isInstance(metric);
            }
        };

        boolean isInstance(Metric metric);
    }

    public Optional get(final String name,
                                          MetricBuilder builder,
                                          Class type) {

        final Metric metric = metrics.get(name);
        if (builder.isInstance(metric)) {
            return Optional.of(type.cast(metric));
        }
        return Optional.absent();

    }

    @SuppressWarnings("unchecked")
    public  List> getGauges() {
        List> gaugesList = new ArrayList<>();
        for (Metric metric : metrics.values()) {
            if (metric instanceof Gauge) {
                gaugesList.add((Gauge) metric);
            }
        }
        return gaugesList;
    }

    public void register(String name, Metric metric) throws IllegalArgumentException {
        final Metric existing = metrics.putIfAbsent(name, metric);
        if (existing != null) {
            throw new IllegalArgumentException("A metric named " +
                    name +
                    " of class " +
                    metric.getClass().getCanonicalName() +
                    " already exists");
        }
    }

}