Esper 0.8.0 review

Esper project is a 100% Java component for CEP and ESP applications. Here are some key features of "Esper": · Event Pattern Matching

License: LGPL (GNU Lesser General Public License) File size: 0K Developer: Tom Bern

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Esper project is a 100% Java component for CEP and ESP applications.

Here are some key features of "Esper":
Event Pattern Matching
Logical and temporal event correlation
Crontab-like timer 'at' operator
Lifecyle of pattern can be controlled by timer and via operators
Pattern-matched events provided to listeners
Event Stream Processing
Time-based, interval-based and lenght-based event windows
Grouping, aggregation, sorting, filtering
Tailored SQL-like query language using select and where clause
Inner-Join of two or more event streams, outer joins
Dynamically generated indexes
Supports both listener (push) and consumer (pull) model
Supports event-type inheritance and polymorphism as provided by the Java language
Event properties can be simple, indexed, mapped or nested
Supports externally-supplied time as well as Java system time
Supports multiple independent Esper engines per JavaVM. Each engine instance itself is NOT multithread-safe, requiring workload structuring per engine if necessary (also see FAQ on multithread-safety).

Limitations:
Esper requires a Java Virtual Machine version 5.0 runtime, or above.
Esper will not work with JavaVM versions 1.4.2 or below.
A Esper engine instance itself is NOT multithread-safe, i.e. 2 or more threads sending events to the same engine instance is not supported. However multiple engine instances with a maximum of one thread per engine instance is supported.