add command to tail the EventLog

bindings/java/src/org/hyperic/sigar/cmd/EventLogTail.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) [2004, 2005, 2006], Hyperic, Inc.
+ * This file is part of SIGAR.
+ * 
+ * SIGAR is free software; you can redistribute it and/or modify
+ * it under the terms version 2 of the GNU General Public License as
+ * published by the Free Software Foundation. This program is distributed
+ * in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+ * even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA.
+ */
+
+package org.hyperic.sigar.cmd;
+
+import org.hyperic.sigar.win32.EventLog;
+import org.hyperic.sigar.win32.EventLogNotification;
+import org.hyperic.sigar.win32.EventLogRecord;
+import org.hyperic.sigar.win32.EventLogThread;
+import org.hyperic.sigar.win32.Win32Exception;
+
+public class EventLogTail {
+
+    private static void tail(String name, Tail tail) throws Win32Exception {
+        EventLog log = new EventLog();
+        log.open(name);
+        int max = log.getNumberOfRecords();
+        if (tail.number < max) {
+            max = tail.number;
+        }
+        int last = log.getNewestRecord();
+        int first = last - max;
+
+        for (int i=first; i<=last; i++) {
+            EventLogRecord record = log.read(i);
+            System.out.println(record);
+        }
+        log.close();
+    }
+
+    private static class TailNotification implements EventLogNotification {
+        public void handleNotification(EventLogRecord event) {
+            System.out.println(event);
+        }
+
+        public boolean matches(EventLogRecord event) {
+            return true;
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        Tail tail = new Tail();
+        tail.parseArgs(args);
+
+        if (tail.files.size() == 0) {
+            tail.files.add(EventLog.SYSTEM);
+        }
+
+        for (int i=0; i<tail.files.size(); i++) {
+            String name = (String)tail.files.get(i);
+            tail(name, tail);
+
+            if (tail.follow) {
+                TailNotification notifier = new TailNotification();
+                EventLogThread thread = 
+                    EventLogThread.getInstance(name);
+                thread.add(notifier);
+                thread.doStart();
+            }
+        }
+
+        if (tail.follow) {
+            System.in.read();
+        }
+    }
+}

bindings/java/src/org/hyperic/sigar/cmd/Tail.java

@@ -21,6 +21,8 @@ package org.hyperic.sigar.cmd;
 import java.io.IOException;
 import java.io.BufferedReader;
 import java.io.Reader;
+import java.util.ArrayList;
+import java.util.List;
 
 import org.hyperic.sigar.Sigar;
 import org.hyperic.sigar.SigarException;
@@ -33,6 +35,30 @@ import org.hyperic.sigar.FileWatcherThread;
  */
 public class Tail {
 
+    public boolean follow;
+    public int number = 10;
+    public List files = new ArrayList();
+
+    public void parseArgs(String args[]) throws SigarException {
+        for (int i=0; i<args.length; i++) {
+            String arg = args[i];
+            if (arg.charAt(0) != '-') {
+                this.files.add(arg);
+                continue;
+            }
+            arg = arg.substring(1);
+            if (arg.equals("f")) {
+                this.follow = true;
+            }
+            else if (Character.isDigit(arg.charAt(0))) {
+                this.number = Integer.parseInt(arg);
+            }
+            else {
+                throw new SigarException("Unknown argument: " + args[i]);
+            }
+        }
+    }
+
     public static void main(String[] args) throws SigarException {
         Sigar sigar = new Sigar();