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java.lang.Object
   |
   +----edu.utah.janos.io.Log

Summary

public class  Log
     extends java.lang.Object
{
          // Fields 16
     public static final int ALERT;
     public static final int CRIT;
     public static final int DBG;
     public static final int EMERG;
     public static final int ERR;
     public static final int INFO;
     public static final int NOTICE;
     private static final int RING_SIZE;
     public static final int WARNING;
     private ByteArrayOutputStream byteStream;
     private PrintWriter byteWriter;
     private Vector listeners;
     private Log.Message[] msg_ring;
     private String prefix;
     private int ring_head;
     private int ring_tail;

          // Constructors 1
     public Log(String);

          // Methods 5
     public void addListener(LogListener);
     public void logMsg(int, String);
     public void logThrowable(Throwable);
     public void removeListener(LogListener);
     public void setPrefix(String);

          // Inner Classes 1
     private class Log.Message
}

A Janos Log interface. A log maintains a buffer of a fixed number of messages. All messages passed to the log via logMsg() are sent to all listeners on the log.

Really just a glorified ring buffer.

Patterned after syslog(3).

Fields

· EMERG

Summary  |  Top

   public static final int EMERG

System is unusable.

   public static final int ALERT

Action must be taken immediately.

   public static final int CRIT

Critical conditions.

   public static final int ERR

Error conditions.

   public static final int WARNING

Warning conditions.

   public static final int NOTICE

Normal but significant condition.

   public static final int INFO

Informational messages.

   public static final int DBG

Debug-level messages.

   private Log.Message[] msg_ring

The ring buffer. The msg_ring is never empty.

   private static final int RING_SIZE

Size of the ring buffer.

   private int ring_head

   private int ring_tail

   private Vector listeners

Listeners on this log. Should be Vector.

   private String prefix

Stores the prefix for the log messages

   private ByteArrayOutputStream byteStream

   private PrintWriter byteWriter

Constructors

· Log

Summary  |  Top

   public Log(String prefix) 

Create a log. All messages sent to this log will be prefixed with the given prefix string.

   public void setPrefix(String prefix) 

Set the prefix message.

   public void logMsg(int level, 
                      String msg) 

Add a message to this log. Added to the ring buffer. All active listeners will recieve the message, too.

   public void logThrowable(Throwable th) 

Add a message to the log thats a stack trace

   public void addListener(LogListener ll) 

Add a listener to this log. The listener will immediately receive all buffered messages and eventually receive all future messages.

   public void removeListener(LogListener ll) 

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