IBM Tivoli Composite Application Manager for Application Diagnostics, Version 7.1.0.4

Types of requests

Request

A request is a call made to a component that performs a service. For example, a call to execute a SQL statement through a JDBC driver or a data source. The following list provides some of the typical J2EE requests that are interesting to monitor, they are all standard J2EE requests that are monitored by the data collector, with no extra custom definitions required:

Invoking a Servlet through the doGet() or doPost() methods
EJB create() and other business methods
JDBC API invocations like getConnection() or executeQuery()
JMS operations to send and receive messages
JNDI operations like lookup() used to find objects stored in the registry
JCA resource adapter operations like getManagedConnection()

Edge request

The outermost request that needs to be monitored is called an edge request. This involves a request that enters the application server from an outside client, for example invoking a Servlet/JSP or a call to an EJB business method through the Object Request Brokers (ORB). However, sometimes this request might not be of interest as it might be a generic call like when Apache Struts applications are involved. In such cases, a custom request might be defined to act as an edge request. In ITCAM for Application Diagnostics, edge requests are tracked starting at L1 monitoring level.

Nested request

A request that is invoked within another request is called a nested request. For example, a JDBC call like getConnection() invoked from within an EJB business method is a nested request. In ITCAM for Application Diagnostics, nested requests are tracked starting at L2 monitoring level.

Custom request

Custom requests are defined for application-specific operations that do not fall under the normal pre-defined J2EE operations. A custom request defines a user-specified class and method as the start and end point of a request. If it is enclosed in another request like a Servlet or EJB request, then it becomes a custom nested request.

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