org.apache.metron.common.stellar.benchmark.Microbenchmark.java Source code

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Here is the source code for org.apache.metron.common.stellar.benchmark.Microbenchmark.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.metron.common.stellar.benchmark;

import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
import org.apache.commons.math3.stat.descriptive.SummaryStatistics;
import org.apache.metron.common.dsl.Context;
import org.apache.metron.common.dsl.VariableResolver;
import org.apache.metron.common.dsl.functions.resolver.FunctionResolver;
import org.apache.metron.common.stellar.StellarProcessor;

import java.util.function.Consumer;

public class Microbenchmark {

    public static class StellarStatement {
        String expression;
        VariableResolver variableResolver;
        FunctionResolver functionResolver;
        Context context;
    }

    public static DescriptiveStatistics run(StellarStatement statement, int warmupRounds, int benchmarkRounds) {
        run(warmupRounds, statement, ts -> {
        });
        final DescriptiveStatistics stats = new DescriptiveStatistics();
        run(benchmarkRounds, statement, ts -> {
            stats.addValue(ts);
        });
        return stats;
    }

    private static void run(int numTimes, StellarStatement statement, Consumer<Long> func) {
        StellarProcessor processor = new StellarProcessor();
        for (int i = 0; i < numTimes; ++i) {
            long start = System.nanoTime();
            processor.parse(statement.expression, statement.variableResolver, statement.functionResolver,
                    statement.context);
            func.accept((System.nanoTime() - start) / 1000);
        }
    }

    public static String describe(DescriptiveStatistics stats, Double[] percentiles) {
        StringBuilder sb = new StringBuilder();
        sb.append(String.format("round: mean of %dms [+-%d], measured %d rounds;\n", (long) stats.getMean(),
                (long) stats.getStandardDeviation(), stats.getN()));
        sb.append("\tMin - " + (long) stats.getMin() + "\n");
        for (double pctile : percentiles) {
            sb.append("\t" + pctile + " - " + stats.getPercentile(pctile) + "\n");
        }
        sb.append("\tMax - " + (long) stats.getMax());
        return sb.toString();
    }

}