org.apache.activemq.util
Class LogWriterFinder

java.lang.Object
  org.apache.activemq.util.LogWriterFinder

public class LogWriterFinder
extends java.lang.Object

Class used to find a LogWriter implementation, and returning a LogWriter object, taking as argument the name of a log writer. The mapping between the log writer names and the classes implementing LogWriter is specified by the files in the resources/META-INF/services/org/apache/activemq/transport/logwriters directory.

Author:

David Martin Clavo david(dot)martin(dot)clavo(at)gmail.com

Constructor Summary

LogWriterFinder(java.lang.String path)
Builds a LogWriterFinder that will look for the mappings between LogWriter names and classes in the directory "path".

Method Summary

protected java.util.Properties	doFindLogWriterProperties(java.lang.String logWriterName) Given a log writer name, returns a Properties object with a "class" property whose value is a String with the name of the class to be loaded.
LogWriter	newInstance(java.lang.String logWriterName) Returns a LogWriter object, given a log writer name (for example "default", or "custom").

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LogWriterFinder

public LogWriterFinder(java.lang.String path)

Builds a LogWriterFinder that will look for the mappings between LogWriter names and classes in the directory "path".

Parameters:

path - The directory where the files that map log writer names to LogWriter classes are.

Method Detail

newInstance

public LogWriter newInstance(java.lang.String logWriterName)
                      throws java.lang.IllegalAccessException,
                             java.lang.InstantiationException,
                             java.io.IOException,
                             java.lang.ClassNotFoundException

Returns a LogWriter object, given a log writer name (for example "default", or "custom"). Uses a ConcurrentHashMap to cache the Class objects that have already been loaded.

Parameters:

logWriterName - a log writer name (for example "default", or "custom").

Returns:

a LogWriter object to be used by the TransportLogger class.

Throws:

java.lang.IllegalAccessException

java.lang.InstantiationException

java.io.IOException

java.lang.ClassNotFoundException

doFindLogWriterProperties

protected java.util.Properties doFindLogWriterProperties(java.lang.String logWriterName)
                                                  throws java.io.IOException

Given a log writer name, returns a Properties object with a "class" property whose value is a String with the name of the class to be loaded.

Parameters:

logWriterName - a log writer name.

Returns:

a Properties object with a "class" property

Throws:

java.io.IOException