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/*
Servlet code for xcos-on-web
Authors: Maverick and Adhitya
Description:
The following servlet creates a shell command to run Scilab without any GUI/simulation window.
The diagram sent from client is stored in a usr-xxx.xcos file and is then simulated. The result
is a .png file which is then sent back to the client.
*/
import java.io.*;
import javax.servlet.*;
import java.util.*;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.FilenameUtils;
public class SciExec extends GenericServlet {
public void service(ServletRequest request,ServletResponse response) throws ServletException, IOException
{
PrintWriter pw = response.getWriter();
InputStream is = null;
ByteArrayOutputStream baos = null;
List<String> commands = new ArrayList<String>();
/*
Maverick & Srikant sir.
Creating a shell command to run Scilab without any GUI so that the simulation window doesn't appear.
*/
commands.add("scilab-adv-cli");
commands.add("-noatomsautoload");
commands.add("-nogui");
commands.add("-nb");
commands.add("-e");
String imagePath="";
String fileNameWithoutExt="";
/*
Maverick
Ignore the following comments.
*/
//---IGNORE---
/*
commands.add("plot3d();xs2png(gcf(),'img2.png');exit();");
String data=request.getParameter("name");
pw.println(data);
commands.add("echo "+data+" > /home/saarang/Softwares/apache-tomcat-8.0.36/webapps/sci/servlet/file.xcos");
commands.add("driver('PNG');xinit('/home/saarang/apache-tomcat-8.0.36/webapps/worknogui/servlet/ans"+k+".png');loadXcosLibs();importXcosDiagram('/home/saarang/apache-tomcat-8.0.36/file.xcos');xcos_simulate(scs_m,4);mode(2);xend();quit();");
*/
//--IGNORE till here---
ProcessBuilder pb = new ProcessBuilder(commands);
try
{
InputStream inputStream = request.getInputStream();
/*
Adhitya
Creating a temporary file in the directory containing tomcat. This file is the .xcos file which will be executed by the Scilab engine.
*/
File xcosFile = File.createTempFile("usr-", ".xcos");
OutputStream outputStream = new FileOutputStream(xcosFile);
IOUtils.copy(inputStream, outputStream);
outputStream.close();
String tempPath = xcosFile.getAbsolutePath();
String parentPath = xcosFile.getParent();
fileNameWithoutExt = FilenameUtils.removeExtension(xcosFile.getName());
/*
Maverick
The resultant .png file which is produced as a result of simulation is stored in a different folder inside the respective webapp directory.
The path of the folder is /path/to/webapp/servlet.
TODO: Modify the following path.
*/
imagePath = "/path/to/webapps/xcos-on-web/servlet"+File.separator + fileNameWithoutExt + ".png";
/*
Maverick
Creating the command which is to be executed using terminal.
*/
commands.add("driver('PNG');xinit('"+imagePath+"');loadXcosLibs();importXcosDiagram('"+tempPath+"');xcos_simulate(scs_m,4);mode(2);xend();quit();");
/*
Maverick
Reference: www.stackoverflow.com
Starting a process to execute the created command.
*/
Process prs = pb.start();
is = prs.getInputStream();
byte[] b = new byte[1024];
int size = 0;
baos = new ByteArrayOutputStream();
while((size = is.read(b)) != -1){
baos.write(b, 0, size);
}
System.out.println(new String(baos.toByteArray()));
}
catch (IOException e)
{
e.printStackTrace();
}
catch(Exception e)
{
pw.println("Exception");
}
finally
{
try {
if(is != null) is.close();
if(baos != null) baos.close();
} catch (Exception ex){}
}
/*
Maverick
Accessing the .png file and sending it to the client.
*/
pw.println("servlet/"+fileNameWithoutExt+".png");
pw.close();
}
}
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