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A collection of resources for building low-latency, scalable web crawlers on Apache Storm.

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/**
 * Licensed to DigitalPebble Ltd under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * DigitalPebble 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 com.digitalpebble.storm.metrics;

import java.util.HashMap;
import java.util.Map;

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

import backtype.storm.metric.api.IMetric;

import com.codahale.metrics.Meter;
import com.codahale.metrics.MetricRegistry;

/**
 * @author Enno Shioji ([email protected])
 */
public class MeterMetric implements IMetric {
    private static final Logger log = LoggerFactory
            .getLogger(MeterMetric.class);

    private final MetricRegistry registry = new MetricRegistry();

    public Meter scope(String key) {
        return registry.meter(key);
    }

    public Object getValueAndReset() {
        final Map ret = new HashMap();

        for (Map.Entry entry : registry.getMeters().entrySet()) {
            String prefix = entry.getKey() + "/";
            Meter meter = entry.getValue();

            ret.put(prefix + "count", meter.getCount());
            ret.put(prefix + "mean_rate", meter.getMeanRate());
            ret.put(prefix + "m1_rate", meter.getOneMinuteRate());
            ret.put(prefix + "m5_rate", meter.getFiveMinuteRate());
            ret.put(prefix + "m15_rate", meter.getFifteenMinuteRate());
        }
        return ret;
    }
}