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/*******************************************************************************
* Copyright (c) 2009, 2023 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.test.perf;
import java.util.concurrent.Callable;
/**
* Base class for execution time test scenarios.
*/
public abstract class TimedScenario implements IPerfScenario {
private static final int RUNS = 10;
private final String description;
protected TimedScenario(final String description) {
this.description = description;
}
public void run(final IPerfOutput output) throws Exception {
final long time = getMinimumTime(getInstrumentedCallable());
final Callable<Void> refRunnable = getReferenceCallable();
final long reftime;
if (refRunnable == null) {
reftime = IPerfOutput.NO_REFERENCE;
} else {
reftime = getMinimumTime(refRunnable);
}
output.writeTimeResult(description, time, reftime);
}
/**
* Runs the given subject several times and returns the minimum execution
* time.
*
* @param subject
* @return minimum execution time in nano seconds
* @throws Exception
*/
private long getMinimumTime(final Callable<Void> subject) throws Exception {
long min = Long.MAX_VALUE;
for (int i = 0; i < RUNS; i++) {
final long t = getTime(subject);
min = Math.min(min, t);
}
return min;
}
private long getTime(final Callable<Void> subject) throws Exception {
long start = System.nanoTime();
subject.call();
return System.nanoTime() - start;
}
protected abstract Callable<Void> getInstrumentedCallable()
throws Exception;
protected Callable<Void> getReferenceCallable() throws Exception {
return null;
}
}
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