/*
* 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.brooklyn.test.performance;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.brooklyn.util.time.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.annotations.Beta;
import com.google.common.base.Charsets;
import com.google.common.io.Files;
@Beta
public class FilePersister implements MeasurementResultPersister {
private static final Logger LOG = LoggerFactory.getLogger(PerformanceTestUtils.class);
private final File dir;
public FilePersister(File dir) {
this.dir = dir;
}
@Override
public void persist(Date date, PerformanceTestDescriptor options, PerformanceTestResult result) {
try {
String dateStr = new SimpleDateFormat(Time.DATE_FORMAT_PREFERRED).format(date);
dir.mkdirs();
File file = new File(dir, "auto-test-results.txt");
file.createNewFile();
Files.append("date="+dateStr+"; test="+options+"; result="+result+"\n", file, Charsets.UTF_8);
File summaryFile = new File(dir, "auto-test-summary.txt");
summaryFile.createNewFile();
Files.append(
dateStr
+"\t"+options.summary
+"\t"+roundToSignificantFigures(result.ratePerSecond, 6)
+"\t"+result.duration
+(result.cpuTotalFraction != null ? "\t"+"cpu="+roundToSignificantFigures(result.cpuTotalFraction, 3) : "")
+"\n",
summaryFile, Charsets.UTF_8);
} catch (IOException e) {
LOG.warn("Failed to persist performance results to "+dir+" (continuing)", e);
}
}
// Code copied from http://stackoverflow.com/questions/202302/rounding-to-an-arbitrary-number-of-significant-digits
private double roundToSignificantFigures(double num, int n) {
if(num == 0) {
return 0;
}
final double d = Math.ceil(Math.log10(num < 0 ? -num: num));
final int power = n - (int) d;
final double magnitude = Math.pow(10, power);
final long shifted = Math.round(num*magnitude);
return shifted/magnitude;
}
}