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/*
* Copyright (C) 2010 Google Inc.
*
* Licensed 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 com.google.caliper;
import com.google.caliper.UserException.CantCustomizeInProcessVmException;
import com.google.caliper.UserException.ExceptionFromUserCodeException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
/**
* Executes a benchmark in the current VM.
*/
final class InProcessRunner {
public void run(String... args) {
Arguments arguments = Arguments.parse(args);
if (!arguments.getUserVms().isEmpty()) {
throw new CantCustomizeInProcessVmException();
}
ScenarioSelection scenarioSelection = new ScenarioSelection(arguments);
PrintStream resultStream = System.out;
System.setOut(nullPrintStream());
System.setErr(nullPrintStream());
try {
Caliper caliper = new Caliper(arguments.getWarmupMillis(), arguments.getRunMillis());
for (Scenario scenario : scenarioSelection.select()) {
TimedRunnable timedRunnable = scenarioSelection.createBenchmark(scenario);
double warmupNanosPerTrial = caliper.warmUp(timedRunnable);
double nanosPerTrial = caliper.run(timedRunnable, warmupNanosPerTrial);
resultStream.println(nanosPerTrial);
}
} catch (Exception e) {
throw new ExceptionFromUserCodeException(e);
}
}
public static void main(String... args) {
try {
new InProcessRunner().run(args);
} catch (UserException e) {
e.display(); // TODO: send this to the host process
System.exit(1);
}
}
public PrintStream nullPrintStream() {
return new PrintStream(new OutputStream() {
public void write(int b) throws IOException {}
});
}
}
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