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WSO2 DAS exposes a single API for external data sources to publish data events to it. Further, it provides configurable options either to either process the data event stream inflow (in memory) for realtime analytics, to persist (in data storage) for batch analytics and/or to index for interactive analytics as shown in the below diagram.
Creating event
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streams
The first step in aggregating data is defining an event stream by creating the event stream definition. A stream definition provides the initial structure and identification required for event processing. It includes a set of data types as properties, name ,version and other attributes. When an external data publisher sends data events to WSO2 DAS (the receiver), it needs to specify the name and version of the stream intended. Also, data events should be sent according to the structure defined in the stream definition. For more information on event streams, see Event Streams.
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Persisting events
WSO2 DAS introduces a pluggable architecture which allows you to persist data events into any relational data storage (i.e. Oracle, MSSQL, MySQL etc.), or NoSQL storage (i.e. Apache HBase, Apache Cassandra etc.). It is also possible for multi data event storage. For an example, the events can be stored in a NoSQL storage while the processed data events can be stored in a relational data storage.