【IT168 技术新闻】 
    Esper 1.0 版本发布了。 

    Esper 是一款纯Java的事件流处理和相关性框架. 

    Esper 提供类似SQL的查询接口, 开发者可以对事件流进行 分组, 过滤, 合并, 排序等操作. 

    Esper 是基于LGPL协议的开源软件. 

    官方提到的特性包括: 

    Event Stream Processing 
    Event Pattern Matching 
    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). 
    Pluggable architecture for event pattern and event stream analysis functions 

    官方站点： 
    http://esper.codehaus.org/