Esper 1.0 版本發布了。Esper 是一款純Java的事件流處理和相關性框架.Esper 提供類似SQL的查詢接口, 開發者可以對事件流進行 分組, 過濾, 合并, 排序等操作.Esper 是基于LGPL協議的開源軟件.官方提到的特性包括:Event Stream ProcessingEvent Pattern MatchingSupports both listener (push) and consumer (pull) model Supports event-type inheritance and polymorphism as provided by the Java languageEvent properties can be simple, indexed, mapped or nestedSupports externally-supplied time as well as Java system timeSupports 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).Pluggable architecture for event pattern and event stream analysis functions