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/**
* Servlet code for xcos-on-web
* Authors: Maverick and Adhitya
* Description: Thefollowing 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 and Srikant:
* 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 block.
*/
/**
* 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();");
*/
ProcessBuilder pb = new ProcessBuilder(commands);
try {
InputStream inputStream = request.getInputStream();
/**
* Adhitya:
* Creating a temporary file in the directory containing
* tomcat. This 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: http://stackoverflow.com/questions/23086778/how-to-access-unix-shell-special-variables-using-java
* 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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