Hook: Adapt DataBasket Log Entries

Requirement

The log entries written by a DataBasket need to be amended, adding information on the process in whose context the operation was performed.

Method of Adaptation

Augment feature

Level of Support

Parameter Pattern

HotSpot

Log management

Hooks used

Incorporate a new process

Participants

SaleProcess, NewProcess

Changes

1. subclass NewProcess of SaleProcess.
2. NewProcess.log overrides SaleProcess.log .
3. synchronisation ( NewProcess.log , SaleProcess.log ).
4. Incorporate a new process [NewProcess = NewProcess].

Comments

• The log method may do anything before calling the super class's log method. The easiest way of adapting the logging is to wrap a new log entry, that will add the process related information, around the given one. However, the information contained in the inner log entry must remain accessible to outside clients.
• The DataBasket sends its log requests to a log.LogContext , which is the SaleProcess that currently uses it. All loggin requests are sent to the context's log method.