Systems and methods can support complex event handling. A complex event handler can receive a current event. The current event may be stored to an event log. The current event may be matched against rule conditions within a rule implementation system. Prior events may be identified, within the rule implementation system, upon which the matched rule conditions also depend. The event log may be searched for the identified prior events. Prior event parameters, corresponding to the identified prior events, may be retrieved from the event log. The rule conditions may be evaluated in view of the current event and the retrieved prior event parameters. Actions may be executed that correspond to the rule conditions triggered in response to the evaluating. Domain specific language expression may be received, processed, and incorporated as rules and facts into the rule implementation system.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A computer-implemented method for complex event handling, comprising: providing, within a complex event handling system, a rule implementation system; providing, separately from the rule implementation system, an event log operable for maintaining a history of past events and associated prior event parameters for future rule testing; receiving, by the complex event handling system, a current event; storing, by the complex event handling system, the current event to the event log; matching, by the complex event handling system, the current event against rule conditions within a rule implementation system; identifying, by the complex event handling system, rule conditions, within the rule implementation system, wherein those rule conditions depend upon both the current event and the past occurrence of a particular prior event; searching, by the complex event handling system, the event log for the particular prior event; retrieving, by the complex event handling system, prior event parameters, from the event log, corresponding to the particular prior event; evaluating, by the complex event handling system, the rule conditions in view of the current event and the retrieved prior event parameters; and executing, by the complex event handling system, actions corresponding to the rule conditions triggered in response to the evaluating. 2. The computer-implemented method of claim 1, wherein the current event comprises communications within a healthcare enterprise. 3. The computer-implemented method of claim 1, wherein the actions comprise communications within a healthcare enterprise. 4. The computer-implemented method of claim 1, further comprising generating an event that is fed back into the complex event handler. 5. The computer-implemented method of claim 1, wherein the rule implementation system comprises a graph database. 6. The computer-implemented method of claim 1, further comprising receiving a domain specific language expression, processing the domain specific language expression to generate a new rule condition, processing the domain specific language expression to generate a new rule action, and incorporating the new rule condition and the new rule action into the rule implementation system. 7. The computer-implemented method of claim 1, wherein the prior event parameters comprise time/date stamps. 8. The computer-implemented method of claim 1, wherein the event log comprises a database of prior received events. 9. The computer-implemented method of claim 1, wherein prior received events stored within the event log are removed from the event log after a specified duration of time. 10. The computer-implemented method of claim 1, wherein matching the current event against rule conditions within the rule implementation system comprises querying a graph database. 11. A complex event handling system, comprising: one or more processing units, and one or more processing modules, wherein the complex event handling system is configured by the one or more processing modules to: provide, within the complex event handling system, a rule implementation system; provide, separately from the rule implementation system, an event log operable for maintaining a history of past events and associated prior event parameters for future rule testing; receive a current event; store the current event to the event log; match the current event against rule conditions within a rule implementation system; identify rule conditions, within the rule implementation system, wherein those rule conditions depend upon both the current event and the past occurrence of a particular prior event; search the event log for the particular prior event; retrieve prior event parameters, from the event log, corresponding to the particular prior event; evaluate the rule conditions in view of the current event and the retrieved prior event parameters; and execute actions corresponding to the rule conditions triggered in response to the evaluating. 12. The complex event handling system of claim 11, wherein the complex event handling system is further configured to receive a domain specific language expression, process the domain specific language expression to generate a new rule condition, process the domain specific language expression to generate a new rule action, and incorporate the new rule condition and the new rule action into the rule implementation system. 13. The complex event handling system of claim 11, wherein the complex event handling system is further configured to generate an event that is fed back into the complex event handling system. 14. The complex event handling system of claim 11, wherein the current event comprises a communication within a healthcare enterprise. 15. The complex event handling system of claim 11, wherein the actions comprise communications within a healthcare enterprise. 16. The complex event handling system of claim 11, wherein the graph database operates in support of a healthcare enterprise. 17. The complex event handling system of claim 11, wherein the rule implementation system comprises rules stored within a graph database. 18. The complex event handling system of claim 11, wherein the event log comprises a database of prior received events. 19. The complex event handling system of claim 11, wherein the prior event parameters comprise time/date stamps. 20. A computer program product, comprising: a non-transitory computer-readable storage medium having computer-readable program code embodied therein that, when executed by one or more computing devices, perform a method comprising: providing, within a complex event handling system, a rule implementation system, wherein rules associated with the rule implementation system are represented within a graph database; providing, separately from the rule implementation system, an event log operable for maintaining a history of past events and associated prior event parameters for future rule testing; receiving a domain specific language expression from a domain user; processing the domain specific language expression to generate a new rule condition; processing the domain specific language expression to generate a new rule action; incorporating the new rule condition and the new rule action into the rule implementation system; receiving, into a complex event handling system, a current event; storing the current event to the event log; matching the current event against rule conditions within the rule implementation system by querying the graph database; identifying rule conditions, within the rule implementation system, wherein those rule conditions depend upon both the current event and the past occurrence of a particular prior event; searching the event log for the particular prior event; retrieving prior event parameters, from the event log, corresponding to the particular prior event; evaluating the rule conditions in view of the current event and the retrieved prior event parameters; executing actions corresponding to the rule conditions triggered in response to the evaluating; and generating an new event that is fed back into the complex event handling system.