The library contains the java bean that represent event envelop containing all metadata of an event.

Envelop contains following fields:

• id : the id of the event
• sequenceNum : the last event number
• eventType : the type of the event
• emissionDate : the date
• transactionId : an id for a transaction, used in case of multiple event in a row
• metadata : a free metadata object for this event
• event : the event himself
• context : a free context object for this event
• version : the version number of the event
• totalMessageInTransaction : the number of messages in the transaction
• numMessageInTransaction : the number of the current message in the transaction, eg 2/5
• entityId : the unique id of the entity concerned by the event
• userId : the id of the user that generate this event
• systemId : the of the system that generate this event

The eventType and version can be used to get the schema of the event.