filemodel.java

实现网格环境下资源调度和分配的仿真

        String doubleIndent = "        ";   // 8 spaces
        buffer.append(doubleIndent);
        buffer.append("try\n");
        buffer.append(doubleIndent);
        buffer.append("{\n");

        String tripleIndent = "            ";   // now become 12 spaces
        buffer.append(tripleIndent);
        buffer.append("Calendar calendar = Calendar.getInstance();\n");
        buffer.append(tripleIndent);
        buffer.append("Random random;\n");
        buffer.append(tripleIndent);
        buffer.append("long seed = 11L*13*17*19*23+1;\n");
        buffer.append(tripleIndent);
        buffer.append("seed = seed * 97 + 1;\n\n");

        buffer.append(tripleIndent);
        buffer.append("String[] eff = {\"\"};\n");
        buffer.append(tripleIndent);
        buffer.append("String[] efp = {\"\"};\n");
        buffer.append(tripleIndent);
        buffer.append("String[] category = { \"*.USER.GridletCompletion\",\n");
        buffer.append(indent);
        buffer.append(tripleIndent);
        buffer.append("\"*.USER.TimeUtilization\", ");
        buffer.append("\"*.USER.BudgetUtilization\" };\n\n");
        buffer.append(tripleIndent);
        buffer.append("String ReportWriterName = \"ReportWriter");
        buffer.append(className);
        buffer.append("\";\n\n");

        // writes gridsim initialization
        int userNum = user_.getTotalUser();
        int resNum = res_.getTotalResource();

        buffer.append(tripleIndent);
        buffer.append("// Initializing GridSim for ");
        buffer.append(userNum);
        buffer.append(" grid users and ");
        buffer.append(resNum);
        buffer.append(" grid resources\n");
        buffer.append(tripleIndent);
        buffer.append("GridSim.init(");
        buffer.append(userNum);
        buffer.append(", calendar, true, eff, efp, ReportWriterName);\n\n");

        buffer.append(tripleIndent);
        buffer.append("// Creates Report Writer entity\n");
        buffer.append(tripleIndent);
        buffer.append("new ReportWriter(ReportWriterName, ");
        buffer.append(userNum);
        buffer.append(", ");
        buffer.append(resNum);
        buffer.append(", \"reportFile");
        buffer.append(className);
        buffer.append("\",\n"); 
        buffer.append(indent);
        buffer.append(tripleIndent);
        buffer.append("category, false, null, true, 10000);\n\n");
        
        // writes grid resources code
        buffer.append( res_.generateCode(tripleIndent) );

        // writes grid users code 
        buffer.append( user_.generateCode(tripleIndent) );

        buffer.append("\n");
        buffer.append(tripleIndent);
        buffer.append("// Starts grid simulation\n");
        buffer.append(tripleIndent);
        buffer.append("GridSim.startGridSimulation();\n");

        // writes catch clause
        buffer.append(doubleIndent);
        buffer.append("}\n");
        buffer.append(doubleIndent);
        buffer.append("catch (Exception e) {\n");
        buffer.append(tripleIndent);
        buffer.append("e.printStackTrace();\n");
        buffer.append(doubleIndent);
        buffer.append("}\n    } \n} \n\n");  // end of main and class

        try
        {
            FileOutputStream out = new FileOutputStream(name);
            BufferedOutputStream outBuffer = new BufferedOutputStream(out);
            outBuffer.write( buffer.toString().getBytes() );
            outBuffer.close();
        }

        catch(Exception e)
        {
            toolkit_.beep();
            JOptionPane.showMessageDialog(frame_,
                    "Sorry, cannot generate Java file.",
                    "Generate GridSim code",
                    JOptionPane.ERROR_MESSAGE);
        }

        toolkit_.beep();
        JOptionPane.showMessageDialog(frame_,
                "Finish generating Java code.",
                "Generate GridSim code",
                JOptionPane.INFORMATION_MESSAGE);
    }


    /////////////////////////////// PRIVATE METHODS ////////////////////////

    /**
     * @param msg   A message 
     * @param type  type of action
     * @return <tt>true</tt> if user wants to save, <tt>false</tt> otherwise
     * @pre msg != null
     * @pre type != null
     * @post $none
     */
    private boolean confirmAction(String msg, String type)
    {
        optionPane_.setMessage(msg);
        JDialog dialog = optionPane_.createDialog(frame_, type);
        toolkit_.beep();
        dialog.show();

        // put try and catch, just in-case the something wrong with casting
        try
        {
            int value = ( (Integer) optionPane_.getValue() ).intValue();
            if (value == JOptionPane.YES_OPTION) {
                return true;
            }
        }
        catch (Exception e) {
            System.out.println("FileModel.confirmAction() : " + e.getMessage());
        }

        return false;
    }

    /**
     * A method that displays the open dialog 
     * @pre $none
     * @post $none
     */
    private void displayOpenDialog()
    {
        fc_.setDialogTitle("Open");
        fc_.setFileFilter(fileFilter_);

        int returnVal =  fc_.showOpenDialog(frame_);
        if (returnVal == JFileChooser.APPROVE_OPTION)
        {
            File file = fc_.getSelectedFile();

            // clear everything
            user_.newValue();
            res_.newValue();
            fileName_ = file.getAbsolutePath();

            // if the filename has no extension, then attach
            String ext = fileFilter_.getExtension(file);
            if (ext == null) {
                fileName_ += ".xml";
            }

            loadXmlFile(fileName_);
        }
    }

    /**
     * A method that reads the given XML (eXtensible Markup Language) file 
     * @param fileName  A file name
     * @pre fileName != null
     * @post $none
     */
    private void loadXmlFile(String fileName)
    {
        // Create an instance of the DocumentBuilderFactory
        DocumentBuilderFactory docFac = DocumentBuilderFactory.newInstance();

        try
        {
            //Get the DocumentBuilder from the factory that we just got above.
            DocumentBuilder docBuilder = docFac.newDocumentBuilder();

            // turn it into an in-memory object
            Document doc = docBuilder.parse(fileName);

            // root element, i.e <gridsimProject>
            Element root = doc.getDocumentElement();
            NodeList nodeList = root.getChildNodes();
            
            Node node;
            String name;

            int length = nodeList.getLength();
            for (int i = 0; i < length; i++)
            {
                node = nodeList.item(i);

                if (node.getNodeType() == Node.ELEMENT_NODE)
                {
                    name = node.getNodeName();
                    NodeList childList = node.getChildNodes();
                    if (name.equals("gridUser") == true) {
                        user_.loadXml(childList);
                    }

                    else if (name.equals("gridResource") == true) {
                        res_.loadXml(childList);
                    }
                }
            }
        }
        catch (Exception ex) {
            System.out.println("FileModel.loadXMLFile() : Error - unable to " +
                    "open and/or read \"" + fileName + "\"");        
        }
    }

    /**
     * A method that displays a save dialog 
     * @pre $none
     * @post $none
     */
    private void displaySaveDialog()
    {
        File file = fc_.getSelectedFile();

        // this will get the absolute directory path + file name
        fileName_ = file.getAbsolutePath();

        // if the filename has no extension, then attach
        String ext = fileFilter_.getExtension(file);
        if (ext == null) {
            fileName_ += ".xml";
        }

        // if a file already exists, then double check with user
        File newFile = new File(fileName_);
        if (newFile.exists() == true)
        {
            StringBuffer msg = new StringBuffer();
            msg.append(fileName_);
            msg.append(" already exists.\n");
            msg.append("Do you want to replace it?");
            
            if (confirmAction(msg.toString(), "Save File") == false)
            {
                fileName_ = null;
                return;
            }
        }

        save();
    }

    /**
     * Saves the Visual Modeler project file into XML format 
     * @pre $none
     * @post $none
     */
    private void save()
    {
        String indent = "    ";  // 4 spaces
        StringBuffer xml = new StringBuffer(1000);
        xml.append("<?xml version=\"1.0\" standalone=\"yes\"?>\n\n");
        
        xml.append("<!-- This file is auto-generated by VisualModeler.\n");
        xml.append("     Created on ");

        Date date = Calendar.getInstance().getTime();
        xml.append( date.toString() );
        xml.append("\n-->\n\n");
        
        xml.append("\n<gridsimProject>");

        // saving grid user
        xml.append( user_.saveFile(indent) );

        // saving grid resource
        xml.append( res_.saveFile(indent) );
        xml.append("\n</gridsimProject>\n");

        try
        {
            FileOutputStream out = new FileOutputStream(fileName_);
            out.write( xml.toString().getBytes() );
            out.close();

            hasSaved_ = true;
            setChanged();
            notifyObservers("save");
        }
        catch(Exception e)
        {
            toolkit_.beep();
            JOptionPane.showMessageDialog(frame_,
                    "Sorry, cannot save this file.",
                    "Saving error",
                    JOptionPane.ERROR_MESSAGE);
        }

        toolkit_.beep();
        JOptionPane.showMessageDialog(frame_,
                "Finish saving file.",
                "Saving file success",
                JOptionPane.INFORMATION_MESSAGE);

    }

} // end class