Key Technology of Internet of Things Middleware and Computer Event Matching Algorithm
Table 1
Types and characteristics of complex events.
Event names
Characteristics
Common events
The general base class that represents other events is the most basic event class
Object event
Represents an event that occurs on one or more entities, representing one occurrence of a tagged item
Aggregate event
Represents the event that occurs in one or more entities that are physically merged (when the case is merged, it is physically limited to the same time and place); that is, multiple physical identical labels are merged into an instance
Quantitative events
Represents events related to a specific number of entities sharing EPC class, and the specific representation of entities is not specified, but the total number of items in the same type of EPC label
Transaction event
Items that are labelled with EPC are linked to commercial transactions; it is no longer a single item count, but involves multiple items
