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• Patterns syntax is used to identify two login attempts, received through the authStream, to the same account by two different IP addresses within 10 seconds. Such two events are named as a1 and b1.
• The arrow (->) denoted that b1 should occur after a1.
• The condition given inside brackets is used to capture events with the same user name but different IP addresses.
• The keyword 'within' specifies that this pattern should occur inside a 10,000 milliseconds time interval.
• Few attributes are selected and inserted to the alertStream.
• 'every' keyword ensures that CEP keeps searching for this pattern for every event received. If this keyword is omitted, CEP will search for the pattern only once, and any subsequent events will be discarded.

Prerequisites

See Prerequisites in CEP Samples Setup page.

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Start the WSO2 CEP server with the sample configuration numbered 0104. For instructions, see Starting sample CEP configurations. This sample configuration does the following:

• Creates <CEP_HOME>/repository/conf/data-bridge/stream-manager-configdefinitions.xml file, which is used to create the stream definitions for the sample.
• Points the default Axis2 repo to <CEP_HOME>/sample/artifacts/0104 (by default, the Axis2 repo is <CEP_HOME>/repository/deployment/server).

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