/*
* Joinery -- Data frames for Java
* Copyright (c) 2014, 2015 IBM Corp.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package joinery.perf;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.UUID;
import joinery.DataFrame;
public class PerformanceTestUtils {
public static final int MILLIONS = 1_000_000;
private static Runtime runtime = Runtime.getRuntime();
private static Random random = new Random();
private static String[] categories = new String[] {
"alpha", "bravo", "charlie", "delta", "echo", "foxtrot"
};
private PerformanceTestUtils() { }
public static DataFrame<Object> randomData(final int rows) {
final DataFrame<Object> df = new DataFrame<Object>("name", "value", "category");
for (int i = 0; i < rows; i++) {
df.append(randomRow());
}
return df;
}
public static DataFrame<Object> randomData(final double utilization) {
final DataFrame<Object> df = new DataFrame<Object>("name", "value", "category");
for (int i = 0; i < MILLIONS || memoryUtilization() < utilization; i++) {
df.append(randomRow());
}
return df;
}
public static List<Object> randomRow() {
return Arrays.<Object>asList(
UUID.randomUUID().toString(),
random.nextInt(100),
categories[random.nextInt(categories.length)]
);
}
public static double memoryUtilization() {
return 1.0 - runtime.freeMemory() / (double)runtime.maxMemory();
}
public static void displayMetricsIfAvailable()
throws Exception {
try {
final Class<?> metrics = Class.forName("joinery.impl.Metrics");
final Method method = metrics.getMethod("displayMetrics");
method.invoke(metrics);
} catch (final ClassNotFoundException ignored) { }
}
}