1 files changed, 133 insertions, 0 deletions
diff --git a/WEB-INF/classes/SciExec.java b/WEB-INF/classes/SciExec.java
new file mode 100755
index 0000000..42c185a
--- /dev/null
+++ b/WEB-INF/classes/SciExec.java
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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();
+    }
+}