add iostat command

bindings/java/src/net/hyperic/sigar/cmd/Iostat.java

@@ -0,0 +1,110 @@
+package net.hyperic.sigar.cmd;
+
+import java.util.ArrayList;
+
+import net.hyperic.sigar.Sigar;
+import net.hyperic.sigar.SigarException;
+import net.hyperic.sigar.FileSystem;
+import net.hyperic.sigar.FileSystemMap;
+import net.hyperic.sigar.FileSystemUsage;
+
+import net.hyperic.sigar.shell.FileCompleter;
+import net.hyperic.sigar.util.GetlineCompleter;
+
+/**
+ * Report filesytem disk space usage.
+ */
+public class Iostat extends SigarCommandBase {
+
+    private static final String OUTPUT_FORMAT =
+        "%-10s %-10s %-10s %-10s";
+
+    //like df -h -a
+    private static final String[] HEADER = new String[] {
+        "Filesystem",
+        "Mounted on",
+        "Reads",
+        "Writes",
+    };
+
+    private GetlineCompleter completer;
+
+    public Iostat(Shell shell) {
+        super(shell);
+        setOutputFormat(OUTPUT_FORMAT);
+        this.completer = new FileCompleter(shell);
+    }
+
+    public Iostat() {
+        super();
+        setOutputFormat(OUTPUT_FORMAT);
+    }
+
+    public GetlineCompleter getCompleter() {
+        return this.completer;
+    }
+
+    protected boolean validateArgs(String[] args) {
+        return args.length <= 1;
+    }
+
+    public String getSyntaxArgs() {
+        return "[filesystem]";
+    }
+
+    public String getUsageShort() {
+        return "Report filesystem disk i/o";
+    }
+
+    public void printHeader() {
+        printf(HEADER);
+    }
+
+    public void output(String[] args) throws SigarException {
+        if (args.length == 1) {
+            FileSystemMap mounts = this.proxy.getFileSystemMap();
+            String name = FileCompleter.expand(args[0]);
+            FileSystem fs = mounts.getMountPoint(name);
+
+            if (fs != null) {
+                printHeader();
+                output(fs);
+                return;
+            }
+
+            throw new SigarException(args[0] +
+                                     " No such file or directory");
+        }
+        else {
+            FileSystem[] fslist = this.proxy.getFileSystemList();
+            printHeader();
+            for (int i=0; i<fslist.length; i++) {
+                if (fslist[i].getType() == FileSystem.TYPE_LOCAL_DISK) {
+                    output(fslist[i]);
+                }
+            }
+        }
+    }
+
+    public void output(FileSystem fs) throws SigarException {
+        FileSystemUsage usage =
+            this.sigar.getFileSystemUsage(fs.getDirName());
+
+        ArrayList items = new ArrayList();
+
+        items.add(fs.getDevName());
+        items.add(fs.getDirName());
+        items.add(String.valueOf(usage.getDiskReads()));
+        items.add(String.valueOf(usage.getDiskWrites()));
+
+        printf(items);
+    }
+
+    private static String formatSize(long size) {
+        return Sigar.formatSize(size * 1024);
+    }
+
+    public static void main(String[] args) throws Exception {
+        new Iostat().processCommand(args);
+    }
+}

bindings/java/src/net/hyperic/sigar/cmd/Shell.java

@@ -55,6 +55,7 @@ public class Shell extends ShellBase {
 
     public void registerCommands() throws ShellCommandInitException {
         registerCommandHandler("df", new Df(this));
+        registerCommandHandler("iostat", new Iostat(this));
         registerCommandHandler("free", new Free(this));
         registerCommandHandler("pargs", new ShowArgs(this));
         registerCommandHandler("penv", new ShowEnv(this));