Globus Trigger Service

The Globus Trigger Service uses basic OGSA service monitoring capabilities to take actions when specific system conditions occur. This can be used to construct email notifications that let system administrators know when services fail.

The Trigger Service subscribes to an Index Service or another source of OGSI or WSRF monitoring information. The Trigger Service is configured with a set of Xpath conditions and, for each contition, an action script that should be run when the condition is satisfied, plus an optional XSLT stylesheet. Each time a notification is received, the Trigger Service checks each Xpath condition against the notification data. If any of the Xpath conditions are is met, the Trigger Service runs the corresponding action scripts with the product of the XLST transformation applied to the matching XML.

An action script can be a simple shell script or a wrapper around other applications such as a grid service client or email client.