COM & .NET Component Services

Configuring the Logbook

Configuring the various logging options is done directly via the Component Services Explorer. After installing the logbook, you will have a new COM+ application called Logbook with three components—the HTML logger, the XML logger, and an event class (see Figure A-3). All three components implement the ILogbook interface with the methods LogError( ), LogEvent( ), and LogMethod( ). The HTML and XML components have four persistent subscriptions—one for each ILogBook method and one for all the methods on the interface.

Figure A-3.  The Logbook application has three components: the HTML logger, the XML logger, and an event class

The main mechanism behind the logging is COM+ loosely coupled events. The macros publish the data as COM+ events, and the logbook components are persistent subscribers. Each logbook component has four persistent subscriptions in its Subscription folder: Errors Only, Methods Only, Events Only, and Log All.

By enabling or disabling a subscription, you can control what is being logged and in what format. After installation, by default, both the HTML and the XML Log All subscriptions are enabled and the other subscriptions are disabled. If, for example, you wish to have only HTML logging of events and errors, you should follow these steps:

• Go to the XML components, select the Log All subscription, display its properties page, go to the Options ...