MBeans for stable resources - JMX in Action - page 85

Table 4.2 The parts of the LoggerMBean interface. Attributes are
described by the getter and setter methods, and operations are
described by the remaining methods.

Declared method Part Description

Attribute Declares write access to LogLevel

setLogLevel()

Attribute Declares read access to LogLevel

getLogLevel()

Operation Declares an exposed operation

retrieveLog()

Operation Declares an exposed operation

writeLog()

The Logger class implements the LoggerMBean with a flat-file implementation.
Listing 4.4 shows the Logger class.

Listing 4.4 Logger.java

package jmxbook.ch4;
import javax.management.*;
import java.io.*;
import java.util.*;
public class Logger implements LoggerMBean
{

public static final int ALL = 3;
public static final int ERRORS = 2;
public static final int NONE = 1;

private PrintWriter out = null;
private int logLevel = Logger.ALL;

public Logger()
{
try
{
//open the initial log file
out = new PrintWriter(
new FileOutputStream
( "record.log " ) );
}
catch( Exception e )
{
e.printStackTrace();
}
}

public void setLogLevel( int level )
{
logLevel = level;
}