This documentation is for WSO2 Complex Event Processor 4.0.0. View documentation for the latest release.
WSO2 Complex Event Processor is succeeded by WSO2 Stream Processor. To view the latest documentation for WSO2 SP, see WSO2 Stream Processor Documentation.

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Events can be processed on Realtime using Siddhi CEP engine. Sequence of events having the same type are defined as a stream and processing by Siddhi using SQL like Siddhi Query Language (SiddhiQL), Siddhi works as an upside down database by storing all the queries in memory, matching incoming events against the stored the queries at runtime and producing matched events as streams.