CN103279840B - Workflow engine implement method based on dynamic language and event processing mechanism - Google Patents
Workflow engine implement method based on dynamic language and event processing mechanism Download PDFInfo
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Abstract
The invention discloses a workflow engine implement method based on a dynamic language and an event processing mechanism, and belongs to the technical field of computer system platforms. An event mechanism is interacted with a service application interface and a backstage service component by the adoption of a low-coupled mode, a main engine loading a dynamically configured working process defines and generates control data and workflow instance data, task flow and dynamic scheduling are carried out by combining service events, dynamic configuration is carried out on the scheduling rule by adopting a service rule language, and real-time adjustment can be carried out according to service change. The event processing mechanism interacts with the backstage service component through synchronous and asynchronous messages, technological realization and services are separated from each other, the defect that a traditional workflow engine needs to adopt a solidified code for binding service is overcome, and efficiency and integration of the service process and the technology are truly achieved.
Description
Technical field
The invention belongs to computer system platform technical field, in particular, provide one kind and be based on dynamic language
Speech and the workflow engine implementation method of event processing mechanism；Solve operation flow collection under multisystem
The workflow becoming is realized.
Background technology
With market competition aggravation, more and more work to improve using working flow mode in enterprise now
Efficiency, reduces human cost., salesman exists taking the order Review Workflow of iron and steel enterprise as a example
Receive user ask list, purpose order, carry out order quality review, finance evaluate process be one
Individual complicated processes, need to carry out targetedly Quality Design for the feature of different user to order
, need production capacity, the production schedule, cost are reasonably assessed to determine whether to produce,
How high efficiency, low cost ground produces, when can consign to user etc..This is accomplished by platform and provides one
Individual good workflow engine, to integrate the sub-process being distributed in different business systems and function, passes through
Realize Complicated Flow task scheduling, node-routing controls, such as branch, merging etc.；It is right to realize
Efficient, convenient, the transparent management and control of operation flow；Realize individual business flow process is built simultaneously
Mould, Dynamical Deployment and issue are realized quick response flow process change request, are followed the tracks of business procession
.
And traditional workflow engine is typically respectively embedded in different business systems, by solidifying code
To bind operation flow, this mode development amount is big, integrated between high cost, system
Complexity, poor expandability, and it is unfavorable for the BPR of enterprise and personalized flow process configuration.
When operation flow mode changes, need each systemic-function participating in workflow is carried out
Modification, changes possibly subversive, is difficult to the quick Continuous optimization supporting operation flow and brings
Business change.
Content of the invention
It is an object of the invention to provide a kind of drawn based on the workflow of dynamic language and event processing mechanism
Hold up implementation method.By rule configuration and event interactive mode by operation flow and technology component solution
Coupling, thus realizing user workflow is independently defined according to operation flow change and individual demand,
Then Dynamical Deployment issues the purpose realizing quick response user's request, solves at conventional operation stream
The difficult problem of the solidification of reason mode business business hard coded, maintenance and expansion.
The present invention adopts case mechanism to adopt lower coupling mode with service application interface, Batch Processing assembly
Interact, the definition of work flow that leading engine loads dynamic configuration generates control data and work
Stream instance data, carries out task circulation and dynamic dispatching in conjunction with business event, its scheduling rule is adopted
Carry out dynamic configuration with Business rule language, real-time adjustment can be carried out according to business change；Thing
Part treatment mechanism is interacted by synchronization, asynchronous message mode and back-end component, and technology is real
Now separate with business, effectively solving conventional operation stream engine needs using solidification code
The drawbacks of binding business, real achieve the efficient, integrated of operation flow and technology
.Comprise the following steps：
1st, workflow modeling：By process modeling instrument, user's work is realized using graphic interface mode
Make user-defined flow, association user role tissue, Component Gallery, event base, ultimately produce work
Stream defines metadata.Workflow metadata includes workflow title, routing node, each node
Redirect rule, the execution task under node.
2nd, workflow registration：Using meta data manager, workflow defining is registered, define work
The startup of each node flowing down, routing-events, event includes starting response events, using dynamic
The response condition of state rule language description, is finally registered in task manager.In addition, to every
Execution task under individual node carries out Authorized operation in Union user management module.
3rd, workflow event is monitored：After workflow defining Metadata registry, loaded by workflow leading engine
Define data, and the startup according to configuration, routing-events, event is monitored.Workflow
Leading engine is the critical piece driving flow process flowing, takes charge of the explanation work process flow definition, creates
And initialize flow instance, the path of control flow flowing, record process flow operation state, hang up
Or wake-up flow process, terminate the flow process being currently running, led to the assembly being distributed in different application
News.
4th, workflow-initiating event triggering：After user interface initiates workflow-initiating event, first,
Task manager receives event, and service request metadata is put into application request by task manager
In context Context, it is distributed to each event sniffer.The response of workflow leading engine starts thing
Part, according to participating user role, incoming request contexts and conditional expression, judges to touch
Whether clockwork spring part meets, if it is satisfied, so starting workflow instance.
5th, work flow step circulation controls：After workflow-initiating, workflow leading engine is fixed according to workflow
Adopted data creates workflow instance and Workflow control data with context data.Wherein, work
Stream example saves execution state and the context data of workflow each step circulation, is used for
Identify the flow performing situation of certain business object；Workflow control data is used for controlling for preservation
The data of workflow processed circulation, include next step execute task, participation role, path node,
With routing rule.
6th, workflow and back-end component communication：After the circulation of certain node, by workflow, master draws workflow
Hold up the routing-events component Configuration according to Workflow control data, Service Component manager is initiated
Event request component call, processes background business logic.Method of calling passes through event driven manner
Interact.Carry out the component call local method of calling of support responding certain event and based on we
The far call mode of bservice.
7th, workflow task scheduling：After workflow circulation terminates, workflow leading engine is according to workflow control
Data processed, calculates and reaches task and the participant that next step need to execute, be assembled into task list
Notify to notify interface to foreground task.Foreground task interface shows certain according to participating user role
The task that individual participant must execute.Task data includes task names, the event of task binding
Number, task binding business object mark with task binding process interface link.
8th, workflow examination ＆ approval event triggering：When flow process participating user, click on a certain at task notifications interface
After bar task, task notifications interface is linked to Business Processing circle according to the process interface that task is bound
In face, carry out corresponding issued transaction for user, after finishing, the circulation of this task is initiated on foreground
Event, to task manager, triggers workflow and circulates to next step, go to step 5, until work
Stream process terminate, and proceed to step 8.
9th, workflow terminates：After workflow terminates, system change workflow instance state is to complete,
Task list is sky, represents there is not execution task.
Wherein, the process modeling instrument described in step 1 definition when at least want configuration flow business classify,
Executable task, route section under flow type, workflow task event, step node, step
Point and route conditions, step enter, task exits calls script or Service Component thing
Part.Wherein business classification, flow type bind the domain object industry under the classification of some business
Business handling process, mainly meets the personalized flow process configuration of user, such as：In steel industry
Order Review Workflow in, business classification classification by product come divide and flow type refer to neck
Field object sales order, the sales order Review Workflow of different product classifications is different；
Entry condition is configured using Dynamic Execution E Language XPR with route conditions.
Using EXPR Dynamic Execution language be autonomous definition dynamic analysis rule language, be to internal memory
Middle Context context data carries out the expression formula of dynamic analysis and execution, including：
1st, arithmetic represents：Refer to basic addition subtraction multiplication and division+,-, * ,/, functional operation, mathematics letter
Number such as CEIL/FLOOR/ROUND/MIN/MAX, and other self-defining function.
2nd, logical expressions：Finger comparison operator>,<,<>,=,>=,<=, with logical operator AND,
OR}
3rd, value expression formula：Refer to expression formula getparms, parameter value from Context context
Line access is entered in Context with list mode, such as：SOI THICKNESS.MID represent from
Take out thickness THICKNESS parameter in SOI subdirectory, and take its average.
The response condition of the employing DP language description described in step 2, refers to dynamically hold using EXPR
Defining the event response condition of workflow nodes task, execute when with flow process is upper for row language
Context data is to workflow instance data storage rule.Wherein, task events configuration institute in the following example
Show：
<Action id=" 101 " name=" creates examination ＆ verification "
event="EVT_SOI_AUDIT_CREATE{entry=soi}[soi\sa\perStateId='ST
A_SOI_REQ_CREATED']">
Here, we define response events, entrance object and the trigger condition creating examination ＆ verification task
, represent after EVT_SOI_AUDIT_CREATE occurs, and the business object of request contexts
When for soi, judge whether the front state of the examination ＆ verification object sa under soi is ' STA_SOI_REQ_C
REATED ', if so trigger this task.
The data storage rule of task circulation event, shown in the following example：
<post-functions>The background process triggering after representing circulation
<function type="txnExec"> PRCS_SOI_MD_MATCH</function>
Represent that triggering PRCS_SOI_MD_MATCH event calls Service Component later.
<function type="EXPR">
#SET soi\soiStatus='STA_SOI_REQ_WT_CONFIRM';
The state of setting soi is " pending "
#NGET soi\eq\eqId;
Judge the eqId under the eq object under context soi, if not being empty, then write into work
In stream example
</function>
</post-functions>
Beneficial effects of the present invention：
The present invention adopts DP language dynamic configuration routing rule, and binds case mechanism and business
Application interface, Batch Processing assembly lower coupling mode interact, and effectively solve conventional operation stream
The drawbacks of engine needs using solidification code binding business, real achieves operation flow and skill
Art efficient, integrated.This engine implementing method has been applied to multiple large-scale items at present
In purpose flow management function, on the whole it is achieved that the flexible configuration of operation flow, being based on
The activity management of event, process tracking, automatically redirect rule with briefing function, simplify
Heavy coding customized development task.In business, business is improved by flexible configuration operation flow
The collaborative co-ordination efficiency of organization department.In maintenance, when flow process changes, only need
Flow file is modified, to alleviate heavy development task.Specific effect is such as
Under：
1st, the individual cultivation towards different business can be met by the flow custom that carries out of authority
2nd, can work in coordination with by the workflow task of user right, the user of different role is according to workflow stream
Cheng Dingyi completes different operating business rule embedded stream favourable turn system, and automatic flow is to be done
The people being prompted to relative role in task is processed.
3rd, the process historical steps of tracking of service flow, are easy to business procession is tracked.
Brief description
Fig. 1 is the workflow engine structural representation of the specific embodiment of the invention.
Fig. 2 is the workflow engine activity chart of the specific embodiment of the invention.
Specific embodiment
The present invention proposes a kind of workflow engine realization side based on dynamic language and event processing mechanism
Method, using DP language dynamic configuration routing rule, and bind case mechanism and business should
Interacted with interface, Batch Processing assembly lower coupling mode, effectively solve conventional operation stream and draw
The drawbacks of hold up needs using solidification code binding business, real achieves operation flow and technology
Efficient, integrated.
Below in conjunction with the accompanying drawings and example in detail, this inventive method is during application implementation, including
Two specific processes, one is the flow process configuration process based on workflow defining tool, in addition one
Individual is in running, carries out authorization check, task scheduling, workflow by workflow engine
Example control process.
In flow process configuration process, mainly to define workflow metadata by process modeling instrument, one
Individual workflow metadata includes traffic flow classification, flow type, workflow task event, step
After under rapid node, step, executable task, routing node and route conditions, condition meet
The information such as the Service Component that need to execute.Specific configuration process is as follows：
1st, operation flow configuration：Type of service belonging to configuration and flow type, flow type is neck
The title of some business object is identified in domain model.Such as：Order evaluation in steel industry
In flow process, business classification classification by product come divide and flow type refer to domain object sale
Order, the pin of different product classification
It is different for selling order Review Workflow.
2nd, start event configuration：Configure the startup event of this flow process, entry condition, the role authorizing or
Tissue.Wherein entry condition to be configured using regular expression EXPR.Regular expression can be visited
Ask the agent object attribute of current operation flow process, meet certain condition by judging some attributes
Start workflow afterwards, or in workflow repeated priming, point out authentication error.
3rd, step node configuration：The activity participating in this flow process is increased to work as a step node
In stream, set the task that the need under each step node are processed, such as examine task.
4th, configuration task event：Tasks carrying is melted in event processing mechanism, defines task start
Event, entrance object data context, circulation condition, Contributor role, next routing node
, in addition, in certain step event of entrance, or configuration rule in certain step event can be left
Expression formula script come to preserve process data in workflow instance or triggering Service Component carry out
Business Processing.Establishment examination ＆ verification task events configuration in the following example：
<Action id=" 101 " name=" creating examination ＆ verification " event=" EVT_SOI_AUDIT_CRE
ATE{entry=soi}[soi\sa\perStateId='STA_SOI_CREATED'"] role=”
Sales”>
Upper example represents that establishment examination ＆ verification task is bound with event EVT_SOI_AUDIT_CREATE,
Object instance be soi, trigger condition be soi sa perStateId='STA_SOI_CREATE
D', represents when before the examination ＆ verification of target service object soi, state creates for order, initiates to examine
Core task.
5th, configure individual path：When multi-player executing tasks parallelly, can be by definition
Branch node is realizing.The individual path of definition after the completion of some task, can be routed to
Distribute multiple nodes to multiple participants.Branch actually includes the combination of multiple nodes
Node.
6th, configure merge node：When multiple Branch Tasks all complete, need to simultaneously enter some
When stationary nodes, realizing, merge node adopts regular expression fixed to definable merge node
Adopted merging condition.Merging rule is complete for each the merge node state participating in branch
Merging can be run after one-tenth.
After the completion of workflow defining, by the metadata release module of platform, workflow defining is noted
Volume, registration process is come into force in real time using Dynamical Deployment mode.Now, workflow event has been noted
Volume, in task manager, when foreground issuing service event, is entered to act by Workflow enactment service
Part is processed.Processing procedure is as follows：
1st, workflow-initiating event：It is assumed that task manager receives the startup that foreground event is workflow
Service request metadata is now put into application request context Contex by incident management by event
In t, metadata at least includes type of service, request object context, and calls workflow execution
Service is processed to request event.
2nd, start Event validation：Whether Workflow enactment service checking entry condition meets, this workflow
Whether example has been turned on and user right checking, if authentication failed, authentication error of dishing out is believed
Cease to foreground.Otherwise, Workflow enactment service calls workflow leading engine to create workflow instance
.
3rd, workflow instance creates：Workflow leading engine is classified according to business, request object type is from unit
Find in data register storehouse and load workflow defining, control data is created according to definition, with work
Make stream example.Control data is value routed path and execution condition, and workflow instance is used for recording
Business datum and historical path information.
4th, workflow task scheduling：Workflow leading engine, according to control data, finds and needs on current procedures
The task of execution, assembling task is in task list, and is appointed according to current Contributor role distribution
It is engaged in the interface of participant foreground.
5th, workflow task notifies：After foreground interface receives background task queue, refresh foreground task
List, participant can click on task and carry out next step operation to operation interface, or selects work
Make stream history and check workflow creation, examination ＆ approval Step Information.
6th, workflow examination ＆ approval event：It is assumed that task manager receives what foreground or other system were issued
Service request metadata is now put into application request by incident management upper and lower by examination ＆ approval message event
In civilian Context, metadata at least includes type of service, request object context, finally calls
Workflow enactment service carries out circulation process.
7th, work flow step circulation：Workflow leading engine is according to the type of service of request contexts, business
Object identity and the task number of event matches, retrieval workflow instance it may be possible to one also with
It is multiple, then conduct interviews control and condition Verification to workflow instance, after being verified,
To workflow instance downward circulation, if this task definition leaves event, then according to event
Call the expression formula script of configuration or Service Component to carry out Business Processing, after finishing, proceed to
Step 4, until workflow processing terminates, proceeds to step 8.
8th, workflow terminates：After workflow terminates, system change workflow instance state is to complete,
Task list is sky, represents there is not execution task.
Present invention achieves a kind of general mechanism by operation flow and technology component decoupling, for user's root
Independently define workflow according to operation flow change and individual demand, then Dynamical Deployment is issued in fact
The purpose of existing quick response, solves the solidification of conventional operation stream process mode business business hard coded
, the difficult problem of maintenance and expansion.Achieve the flexible configuration of operation flow, activity management,
Process tracking, automatically redirect rule and briefing function, simplify heavy coding customization and open
The task of sending out.The collaborative association of work organization department is improved by flexible configuration operation flow on business
Adjust work efficiency.When flow process changes it is only necessary to repair to flow file on safeguarding
Change, alleviate heavy development task.
Claims (3)
1. a kind of workflow engine implementation method based on dynamic language and event processing mechanism it is characterised in that
Comprise the following steps：
(1) workflow modeling：By process modeling instrument, user job is realized using graphic interface mode
User-defined flow, association user role tissue, Component Gallery, event base, ultimately produce workflow defining metadata；
Workflow metadata include workflow title, routing node, each node redirect rule, the execution under node
Task；
(2) workflow registration：Using meta data manager, workflow defining is registered, define workflow
Under the startup of each node, routing-events, event include start response events, retouched using DP language
The response condition stated, is finally registered in task manager；In addition, to the execution task under each node in system
Carry out Authorized operation in one user management module；
(3) workflow event is monitored：After workflow defining Metadata registry, it is fixed to be loaded by workflow leading engine
Adopted data, and the startup according to configuration, routing-events, monitor to event；Workflow leading engine is to drive
The critical piece of flow process flowing, takes charge of the explanation work process flow definition, creates and initialize flow instance, control
The path of flow process flowing, records process flow operation state, hangs up or wakes up flow process, terminates the flow process being currently running,
Communicated with the assembly being distributed in different application；
(4) workflow-initiating event triggering：After user interface initiates workflow-initiating event, first, thing
Part manager receives event, and service request metadata is put into application request context by task manager
In Context, it is distributed to each event sniffer；Workflow leading engine responds startup event, is used according to participation
Family role, incoming request contexts and conditional expression, judge whether trigger condition meets, if it is satisfied,
So start workflow instance；
(5) work flow step circulation controls：After workflow-initiating, workflow leading engine is according to workflow defining
Data creates workflow instance and Workflow control data with context data；Wherein, workflow instance saves
The execution state of workflow each step circulation and context data, for identifying the flow process of certain business object
Practice condition；Workflow control data is used for preserving the data for controlling workflow circulation, holds including next step
Row task, participation role, path node and routing rule；
(6) workflow and back-end component communicate：Workflow certain node circulation after, by workflow leading engine
According to the routing-events component Configuration of Workflow control data, assembly is asked to Service Component manager initiated event
Call, process background business logic；Method of calling is interacted by event driven manner, is responding certain thing
Local method of calling and the far call mode based on webservice are supported on the component call mode of part；
(7) workflow task scheduling：After workflow circulation terminates, workflow leading engine is according to Work-flow control
Data, calculates and reaches task and the participant that next step need to execute, be assembled into task list and notify to appoint to foreground
Business notifies interface, and foreground task interface shows, according to participating user role, the task that certain participant must execute；
Task data includes task names, the event number of task binding, the business object mark of task binding and appoints
The process interface link of business binding；
(8) workflow examination ＆ approval event triggering：When flow process participating user, click on a certain bar at task notifications interface
After task, task notifications interface is linked in Business Processing interface according to the process interface that task is bound, for user
Carry out corresponding issued transaction, after finishing, the circulation event of this task is initiated to task manager in foreground, triggers
Workflow circulates to next step, goes to step (5), until workflow processing terminates, proceeds to step (9)；
(9) workflow terminates：After workflow terminates, system change workflow instance state is to complete, and appoints
Business list is sky, an execution task in the absence of expression；
Process modeling instrument described in step (1) at least wants the classification of configuration flow business, flow process class in definition
Executable task, routing node and route conditions under type, workflow task event, step node, step,
What step entrance, task exited calls script or Service Component event；Wherein business classification, flow type are tied up
It is set to the domain object business processing flow under the classification of some business, mainly meet the personalized flow process of user
Configuration, in the order Review Workflow of steel industry, business classification classification by product is dividing and flow type refers to
Be domain object sales order, the sales order Review Workflow of different product classifications is different；Route
Condition is configured using EXPR Dynamic Execution language；
EXPR Dynamic Execution language is the dynamic analysis rule language of autonomous definition, is to Context in internal memory
Context data carries out the expression formula of dynamic analysis and execution, including：
Arithmetic represents：Refer to basic addition subtraction multiplication and division+,-, * ,/, functional operation, mathematical function
CEIL/FLOOR/ROUND/MIN/MAX, and other self-defining function；
Logical expressions：Refer to comparison operator>,<,<>,=,>=,<=, with logical operator AND, OR；
Value expression formula：Refer to expression formula getparms from Context context, parameter value is with list mode
Enter line access in Context.
2. method according to claim 1 is it is characterised in that described parameter value is existed with list mode
Context enters line access, in the following ways：SOI THICKNESS.MID represent from SOI subdirectory
Middle taking-up thickness THICKNESS parameter, and take its average.
3. method according to claim 1 is it is characterised in that the employing described in step (2) is dynamically advised
Then the response condition of language description, refers to define workflow nodes task using EXPR Dynamic Execution language
Event response condition, with context data when flow performing to workflow instance data storage rule；Wherein,
Response events, entrance object and the trigger condition creating examination ＆ verification task is defined in task events configuration.
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