Project Broadway is an extensible and customizable monitoring API.

clipped from code.google.com Project Broadway Project Broadway is an extensible and customizable monitoring API. Broadway lets developers easily create monitor components to observe pre-defined conditions and specify how to react when these conditions are encountered. At its core, Broadway lets developers separate the monitoring concerns from the observed resources. It has a flexible design, which allows it to work in any context where JavaBean-style getter property values can be read either directly through in-VM method invocation or through some detached mechanism (i.e. proxy, reflection, rmi, jmx, web service, etc). Broadway's simplified design offers two major high level components: a Monitor and an Action components. The Monitor lets you specify the resources to monitor and an expression (default expression language is Groovy) used to monitor these resources . The Action component specifies the action to execute when a specified monitored states are realized at a given time.