org.apache.metron.performance.load.monitor.writers.Writer.java Source code

Introduction

Here is the source code for org.apache.metron.performance.load.monitor.writers.Writer.java

Source

/**
 * 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.metron.performance.load.monitor.writers;

import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
import org.apache.metron.performance.load.monitor.AbstractMonitor;
import org.apache.metron.performance.load.monitor.Results;

import java.util.ArrayList;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
import java.util.function.Consumer;

public class Writer {

    private int summaryLookback;
    private List<LinkedList<Double>> summaries = new ArrayList<>();
    private List<Consumer<Writable>> writers;
    private List<AbstractMonitor> monitors;

    public Writer(List<AbstractMonitor> monitors, int summaryLookback, List<Consumer<Writable>> writers) {
        this.summaryLookback = summaryLookback;
        this.writers = writers;
        this.monitors = monitors;
        for (AbstractMonitor m : monitors) {
            this.summaries.add(new LinkedList<>());
        }
    }

    public void writeAll() {
        int i = 0;
        Date dateOf = new Date();
        List<Results> results = new ArrayList<>();
        for (AbstractMonitor m : monitors) {
            Long eps = m.get();
            if (eps != null && summaryLookback > 0) {
                LinkedList<Double> summary = summaries.get(i);
                addToLookback(eps.doubleValue(), summary);
                results.add(new Results(m.format(), m.name(), eps, Optional.of(getStats(summary))));
            } else {
                results.add(new Results(m.format(), m.name(), eps, Optional.empty()));
            }
            i++;
        }
        Writable writable = new Writable(dateOf, results);
        for (Consumer<Writable> writer : writers) {
            writer.accept(writable);
        }
    }

    private void addToLookback(Double d, LinkedList<Double> lookback) {
        if (lookback.size() >= summaryLookback) {
            lookback.removeFirst();
        }
        lookback.addLast(d);
    }

    public DescriptiveStatistics getStats(List<Double> avg) {
        DescriptiveStatistics stats = new DescriptiveStatistics();
        for (Double d : avg) {
            if (d == null || Double.isNaN(d)) {
                continue;
            }
            stats.addValue(d);
        }
        return stats;
    }
}