The design pattern of CEP--building modules

I. Events (EVENT)
is defined by the schema.
is the tuple of the event property


Flow (stream) event flow
Time ordered sequence of event is a chronological sequence of events
Append-only cannot remove events, only append

unbounded Without Borders.

STREAM
 examples:
{1s, event1}, {2s, event2}, {4s, event3}}
Valid stream
{1s, event1}, {4s, Event2}, {2s, event3}}
 not a STREAM, this is a EVENT CLOUD.


Third, relationship relation
      Some instantaneous package event
      Allow inserts, deletes, updates


For example:
Example :
 at t=1: {{event1}, {Event2}, {Event3}}
at t=2: {{event1}, {Event3}, {event4}}
No changes to Event1 and Event3
 event2 is deleted
 event4 was inserted




Four, Operation OPERATORS
  1: conversion Flows and relationships
  2: Operation type
      relationship to relationship   such as: relational database (Project,filter,join)
      stream to relationship nbsp; From flow to relationship window actions
  3: Related to Flow
  4: Streaming to stream


Summary:
CEP is a contact flow event handling
Flow is an only added, time based stream sequence
A relationship is a time when you can add, modify, and delete events collection