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The local handler just formats the logs in a convenient way to stdout, while the central handler takes advantage of the ACS Log Service to distribute the logs to any interested client.
Java
C++
The C++ logging implementation is based in the ACE Logging framework which imposes several restrictions and complications for the implementation. The design for the logging system is similar to log4j, python logging, etc. which is convenient and familiar, offering different handlers for stdout, file, central logger, etc.
As opposed to Java and Python, in C++ it was decided that the logger reference would not be handled by developers, but instead there are macros that can be called from any place and those macros have the responsibility of obtaining an appropriate logger instance for performing the log calls.
Notification Channel
The Notification Channel is a CORBA service for decoupled messaging through events. We're currently using the implementation provided by ACE/TAO through the Notify Service. For more details please look at the Notification Channel technical document.
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