A multi-thread supported service and custom action management system for Apache
Commons SCXML engine
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Key: SCXML-117
URL: https://issues.apache.org/jira/browse/SCXML-117
Project: Commons SCXML
Issue Type: New Feature
Environment: Java environment
Reporter: Gui Xunlong
Abstract:
Apache Commons SCXML is an implementation aimed at creating and maintaining a
Java SCXML engine capable of executing a state machine defined using a SCXML
document which is very useful to handler complex status transfer logic.This
project aims to implement a multi-thread supported service and custom action
management system for Commons SCXML.
Description:
State Chart XML (SCXML) provides a generic state-machine based execution
environment based on Harel State Tables and is very useful to handler complex
status transfer logic.Apache Commons SCXML is an implementation aimed at
creating and maintaining a Java SCXML engine capable of executing a state
machine defined using a SCXML document. It is just a single thread SCXML
engine,if user want to implement a whole SCXML based application, he must do
some secondary development jobs.
This project aims to develop a open source multi-thread SCXML services
management system. It includes these main function module,and this is also what
i need to do:
1.Custom actions management module
All the system custom actions are registered in a configuration xml named
system_custom_actions.xml.
Each custom action Java Class must implement interface
org.apache.commons.scxml.model.Action, and write practical code in function
execute(final EventDispatcher evtDispatcher, final ErrorReporter errRep, final
SCInstance scInstance, final Log appLog, final Collection derivedEvents)
When system initializate, load all the custom actions Class from
system_custom_actions.xml,instance them and add them into system context
environment.User can use this mechanism to add his own custom actions to the
system
Create a Java Swing based Graphics User Interface to add,modify,delete custom
actions into the system.
2.Thread pool management module
Use a thread pool mechanism to manage SCXML engines. The thread pool properties
information is stored in a XML confiuration file named
system_thread_pool.xml,it includes these attributes:
min_thead_number,max_thread_number,thread_release_timespan may be some more
When system initializate, it will instance several SCXML engines objects
according to min_thread_number. If these thread are all busy, but one new
service is start,system will start a new thread to handle this service. The
thead number can not outstrip max_thread_number. If a thread has been free for
a period of time which is marked by attribute thread_release_timespan,system
will release this thread.
3.Service management module
Every application service is a SCXML document,all the system services are
registered in a configuration xml file named system_service.xml, each service
has a unique id which is used to mark the service.
4.Service manage and monitor module
Build a Java Swing GUI to check service list,start,stop,deploy or delete some
services.And also, it has a sub system to monitor running service status,look
over data in running context,reset this service or kill it.
5.Event dispatch module
Implement a EventDispather class instance to send Event to the system. Each
Event will contain a service id which is used to mark its owner service and
specific event content.
This is a whole SCXML deploy and management system. If user want to implement
some SCXML based application, just write proper SCXML document and
corresponding custom actions,register them in to the system,and start the
service,it is done.
I think it is a practical SCXML engine,it will make Apache Commons SCXML more
and more popular,In fact, i have finish some function module, such as custom
action management module.
I think this is a proper project for GSoC under Apache Commons SCXML, but i
have not a mentor yet, any one interested in it, please contact
[email protected]
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