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

Introduction

Here is the source code for org.apache.metron.performance.load.monitor.writers.ConsoleWriter.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.lang3.StringUtils;
import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
import org.apache.metron.performance.load.monitor.Results;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.function.Consumer;

public class ConsoleWriter implements Consumer<Writable> {

    private String getSummary(DescriptiveStatistics stats) {
        return String.format("Mean: %d, Std Dev: %d", (int) stats.getMean(), (int) Math.sqrt(stats.getVariance()));
    }

    @Override
    public void accept(Writable writable) {
        List<String> parts = new ArrayList<>();
        Date date = writable.getDate();
        for (Results r : writable.getResults()) {
            Long eps = r.getEps();
            if (eps != null) {
                String part = String.format(r.getFormat(), eps);
                if (r.getHistory().isPresent()) {
                    part += " (" + getSummary(r.getHistory().get()) + ")";
                }
                parts.add(part);
            }
        }
        if (date != null) {
            DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
            String header = dateFormat.format(date) + " - ";
            String emptyHeader = StringUtils.repeat(" ", header.length());
            for (int i = 0; i < parts.size(); ++i) {
                String part = parts.get(i);
                if (i == 0) {
                    System.out.println(header + (part == null ? "" : part));
                } else {
                    System.out.println(emptyHeader + (part == null ? "" : part));
                }
            }
        }
    }
}