org.apache.hadoop.metrics2.impl.MetricsRecords.java Source code

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Here is the source code for org.apache.hadoop.metrics2.impl.MetricsRecords.java

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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.hadoop.metrics2.impl;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import org.apache.hadoop.metrics2.AbstractMetric;
import org.apache.hadoop.metrics2.MetricsRecord;
import org.apache.hadoop.metrics2.MetricsTag;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

/**
 * Utility class mainly for tests
 */
public class MetricsRecords {

    public static void assertTag(MetricsRecord record, String tagName, String expectedValue) {
        MetricsTag processIdTag = getFirstTagByName(record, tagName);
        assertNotNull(processIdTag);
        assertEquals(expectedValue, processIdTag.value());
    }

    public static void assertMetric(MetricsRecord record, String metricName, Number expectedValue) {
        AbstractMetric resourceLimitMetric = getFirstMetricByName(record, metricName);
        assertNotNull(resourceLimitMetric);
        assertEquals(expectedValue, resourceLimitMetric.value());
    }

    private static MetricsTag getFirstTagByName(MetricsRecord record, String name) {
        return Iterables.getFirst(Iterables.filter(record.tags(), new MetricsTagPredicate(name)), null);
    }

    private static AbstractMetric getFirstMetricByName(MetricsRecord record, String name) {
        return Iterables.getFirst(Iterables.filter(record.metrics(), new AbstractMetricPredicate(name)), null);
    }

    private static class MetricsTagPredicate implements Predicate<MetricsTag> {
        private String tagName;

        public MetricsTagPredicate(String tagName) {

            this.tagName = tagName;
        }

        @Override
        public boolean apply(MetricsTag input) {
            return input.name().equals(tagName);
        }
    }

    private static class AbstractMetricPredicate implements Predicate<AbstractMetric> {
        private String metricName;

        public AbstractMetricPredicate(String metricName) {
            this.metricName = metricName;
        }

        @Override
        public boolean apply(AbstractMetric input) {
            return input.name().equals(metricName);
        }
    }
}