Add Entgra Device Notification Logger #51

Purpose

Allow users to configure logger, instead of using a default logger.

Goals

MDC in Log4j allows users to fill a map-like structure with pieces of information that are accessible to the appender when the log message is actually written.

Approach

In MDC, the context is passed into a map structure, and in logFormatter, you just call the context key to get the context value.

MDC.put("Device", "abcd");
MDC.put("userId", "1234");

For referring to the MDC context keys, we use the %X specifier that is used to print the current thread’s Mapped Diagnostic Context (MDC).

Use %X to include the full contents of the Map.
Use %X{key} to include the specified key.

layout.pattern = TID: [%d] [%tenantId] [%X{Device}] [%X{userId}] - %m%ex%n

Documentation

N/A