/**
* Copyright (c) 2014 Richard Warburton (richard.warburton@gmail.com)
* <p>
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
* <p>
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
* <p>
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
**/
package com.insightfullogic.honest_profiler.testing_utilities;
import com.insightfullogic.honest_profiler.core.platform.Platforms;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.util.function.Consumer;
import static java.lang.Integer.parseInt;
public class AgentRunner
{
private static final Logger logger = LoggerFactory.getLogger(AgentRunner.class);
public static final String DEFAULT_AGENT_INTERVAL = "interval=100";
private final String className;
private final String args;
private Process process;
private int processId;
private AgentRunner(final String className, final String args)
{
this.className = className;
this.args = args;
}
public static void run(final String className, final Consumer<AgentRunner> handler) throws IOException
{
run(className, (String) null, handler);
}
public static void run(final String className,
final String[] args,
final Consumer<AgentRunner> handler) throws IOException
{
run(className, String.join(",", args), handler);
}
public static void run(final String className,
final String args,
final Consumer<AgentRunner> handler) throws IOException
{
AgentRunner runner = new AgentRunner(className, args);
runner.start();
try
{
handler.accept(runner);
}
finally
{
runner.stop();
}
}
private void start() throws IOException
{
startProcess();
readProcessId();
}
private void startProcess() throws IOException
{
String java = System.getProperty("java.home") + "/bin/java";
String agentArg = "-agentpath:build/liblagent" + Platforms.getDynamicLibraryExtension() + (args != null ? "=" + args : "");
// Eg: java -agentpath:build/liblagent.so -cp target/classes/ InfiniteExample
process = new ProcessBuilder()
.command(java, agentArg, "-cp", "target/classes/", className)
.redirectError(new File("/tmp/error.log"))
.start();
}
private void readProcessId() throws IOException
{
try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream())))
{
String line = reader.readLine();
System.out.println(line);
processId = parseInt(line);
}
}
private void stop()
{
process.destroy();
try
{
process.waitFor();
}
catch (InterruptedException e)
{
logger.info(e.getMessage(), e);
}
}
public int getProcessId()
{
return processId;
}
public void startProfiler()
{
messageProcess('S');
}
public void stopProfiler()
{
messageProcess('s');
}
private void messageProcess(final char message)
{
try
{
final OutputStream outputStream = process.getOutputStream();
outputStream.write(message);
outputStream.write('\n');
outputStream.flush();
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
}