swt/org.argeo.swt.minidesktop/src/org/argeo/minidesktop/MiniHomePart.java

   1 package org.argeo.minidesktop;
   2
   3 import java.net.InetAddress;
   4 import java.net.InterfaceAddress;
   5 import java.net.NetworkInterface;
   6 import java.net.SocketException;
   7 import java.net.UnknownHostException;
   8 import java.util.Enumeration;
   9
  10 import org.eclipse.swt.SWT;
  11 import org.eclipse.swt.layout.GridData;
  12 import org.eclipse.swt.layout.GridLayout;
  13 import org.eclipse.swt.widgets.Composite;
  14 import org.eclipse.swt.widgets.Control;
  15 import org.eclipse.swt.widgets.Display;
  16 import org.eclipse.swt.widgets.Group;
  17 import org.eclipse.swt.widgets.Label;
  18 import org.eclipse.swt.widgets.ProgressBar;
  19 import org.eclipse.swt.widgets.ToolBar;
  20
  21 /** A start page displaying network information and resources. */
  22 public class MiniHomePart {
  23
  24         public Control createUiPart(Composite parent, Object context) {
  25                 parent.setLayout(new GridLayout(2, false));
  26                 Display display = parent.getDisplay();
  27
  28                 // Apps
  29                 Group appsGroup = new Group(parent, SWT.NONE);
  30                 appsGroup.setText("Apps");
  31                 appsGroup.setLayoutData(new GridData(SWT.FILL, SWT.TOP, false, false, 2, 1));
  32                 ToolBar appsToolBar = new ToolBar(appsGroup, SWT.HORIZONTAL | SWT.FLAT);
  33                 fillAppsToolBar(appsToolBar);
  34
  35                 // Host
  36                 Group hostGroup = new Group(parent, SWT.NONE);
  37                 hostGroup.setLayoutData(new GridData(SWT.FILL, SWT.TOP, false, false));
  38                 hostGroup.setText("Host");
  39                 hostGroup.setLayout(new GridLayout(2, false));
  40                 label(hostGroup, "Hostname: ");
  41                 try {
  42                         InetAddress defaultAddr = InetAddress.getLocalHost();
  43                         String hostname = defaultAddr.getHostName();
  44                         label(hostGroup, hostname);
  45                         label(hostGroup, "Address: ");
  46                         label(hostGroup, defaultAddr.getHostAddress());
  47                 } catch (UnknownHostException e) {
  48                         label(hostGroup, e.getMessage());
  49                 }
  50
  51                 Enumeration<NetworkInterface> netInterfaces = null;
  52                 try {
  53                         netInterfaces = NetworkInterface.getNetworkInterfaces();
  54                 } catch (SocketException e) {
  55                         label(hostGroup, "Interfaces: ");
  56                         label(hostGroup, e.getMessage());
  57                 }
  58                 if (netInterfaces != null)
  59                         while (netInterfaces.hasMoreElements()) {
  60                                 NetworkInterface netInterface = netInterfaces.nextElement();
  61                                 byte[] hardwareAddress = null;
  62                                 try {
  63                                         hardwareAddress = netInterface.getHardwareAddress();
  64                                         if (hardwareAddress != null) {
  65                                                 label(hostGroup, convertHardwareAddress(hardwareAddress));
  66                                                 label(hostGroup, netInterface.getName());
  67                                                 for (InterfaceAddress addr : netInterface.getInterfaceAddresses()) {
  68                                                         label(hostGroup, cleanHostAddress(addr.getAddress().getHostAddress()));
  69                                                         label(hostGroup, Short.toString(addr.getNetworkPrefixLength()));
  70                                                 }
  71                                         }
  72                                 } catch (SocketException e) {
  73                                         label(hostGroup, e.getMessage());
  74                                 }
  75                         }
  76
  77                 // Resources
  78                 Group resGroup = new Group(parent, SWT.NONE);
  79                 resGroup.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false));
  80                 resGroup.setText("Resources");
  81                 resGroup.setLayout(new GridLayout(3, false));
  82
  83                 Runtime runtime = Runtime.getRuntime();
  84
  85                 String maxMemoryStr = Long.toString(runtime.maxMemory() / (1024 * 1024)) + " MB";
  86                 label(resGroup, "Max Java memory: ");
  87                 label(resGroup, maxMemoryStr);
  88                 label(resGroup, "Java version: " + Runtime.version().toString());
  89
  90                 label(resGroup, "Usable Java memory: ");
  91                 Label totalMemory = label(resGroup, maxMemoryStr);
  92                 ProgressBar totalOnMax = new ProgressBar(resGroup, SWT.SMOOTH);
  93                 totalOnMax.setMaximum(100);
  94                 label(resGroup, "Used Java memory: ");
  95                 Label usedMemory = label(resGroup, maxMemoryStr);
  96                 ProgressBar usedOnTotal = new ProgressBar(resGroup, SWT.SMOOTH);
  97                 totalOnMax.setMaximum(100);
  98                 new Thread() {
  99                         @Override
 100                         public void run() {
 101                                 while (!totalOnMax.isDisposed()) {
 102                                         display.asyncExec(() -> {
 103                                                 if (totalOnMax.isDisposed())
 104                                                         return;
 105                                                 totalOnMax.setSelection(javaTotalOnMaxPerct(runtime));
 106                                                 usedOnTotal.setSelection(javaUsedOnTotalPerct(runtime));
 107                                                 totalMemory.setText(Long.toString(runtime.totalMemory() / (1024 * 1024)) + " MB");
 108                                                 usedMemory.setText(
 109                                                                 Long.toString((runtime.totalMemory() - runtime.freeMemory()) / (1024 * 1024)) + " MB");
 110                                         });
 111                                         try {
 112                                                 Thread.sleep(1000);
 113                                         } catch (InterruptedException e) {
 114                                                 return;
 115                                         }
 116                                 }
 117                         }
 118                 }.start();
 119                 return parent;
 120         }
 121
 122         protected void fillAppsToolBar(ToolBar toolBar) {
 123
 124         }
 125
 126         protected int javaUsedOnTotalPerct(Runtime runtime) {
 127                 return Math.toIntExact((runtime.totalMemory() - runtime.freeMemory()) * 100 / runtime.totalMemory());
 128         }
 129
 130         protected int javaTotalOnMaxPerct(Runtime runtime) {
 131                 return Math.toIntExact((runtime.totalMemory()) * 100 / runtime.maxMemory());
 132         }
 133
 134         protected Label label(Composite parent, String text) {
 135                 Label label = new Label(parent, SWT.WRAP);
 136                 label.setText(text);
 137                 return label;
 138         }
 139
 140         protected String cleanHostAddress(String hostAddress) {
 141                 // remove % from Ipv6 addresses
 142                 int index = hostAddress.indexOf('%');
 143                 if (index > 0)
 144                         return hostAddress.substring(0, index);
 145                 else
 146                         return hostAddress;
 147         }
 148
 149         protected String convertHardwareAddress(byte[] hardwareAddress) {
 150                 if (hardwareAddress == null)
 151                         return "";
 152                 // from https://stackoverflow.com/a/2797498/7878010
 153                 StringBuilder sb = new StringBuilder(18);
 154                 for (byte b : hardwareAddress) {
 155                         if (sb.length() > 0)
 156                                 sb.append(':');
 157                         sb.append(String.format("%02x", b).toUpperCase());
 158                 }
 159                 return sb.toString();
 160         }
 161 }