In this article, Vivek Acharya, the author of the book, Oracle BPM Suite 12c Modeling Patterns, has discussed the various patterns in Oracle. The spectrum of this book covers patterns and scenarios from strategic alignment (the goals and strategy model) to flow patterns. From conversation, collaboration, and correlation patterns to exception handling and management patterns; from human task patterns and business-IT collaboration to adaptive case management; and many more advance patterns and features have been covered in this book. This is an easy-to-follow yet comprehensive guide to demystify the strategies and best practices for developing BPM solutions on the Oracle BPM 12c platform. All patterns are complemented with code examples to help you better discover how patterns work. Real-life scenarios and examples touch upon many facets of BPM, where solutions are a comprehensive guide to various BPM modeling and implementation challenges.

(For more resources related to this topic, see here.)

In this section, we will cover dynamic task assignment patterns in detail, while a glimpse of the strategic alignment pattern is offered.

Dynamic task assignment pattern

Business processes need human interactions for approvals, exception management, and interaction with a running process, group collaboration, document reviews or case management, and so on. There are various requirements for enabling human interaction with a running BPMN process, which are accomplished using human tasks in Oracle BPM.

Human tasks are implemented by human workflow services that are responsible for the routing of tasks, assignment of tasks to users, and so on. When a token arrives at the user task, control is passed from the BPMN process to Oracle Human Workflow, and the token remains with human tasks until it's completed. As callbacks are defined implicitly, once the workflow is complete, control is returned back to the user task and the token moves ahead to subsequent flow activities.

When analyzing all the human task patterns, it's evident that it comprises various features, such as assignment patterns, routing patterns, participant list builder patterns, and so on. Oracle BPM offers these patterns as a template for developers, which can be extended. The participants are logically grouped using stages that define the assignment with a routing slip. The assignment can be grouped based on assignment modeling patterns. It could be sequential, parallel, or hybrid.

Routing of the tasks to participants is governed by the routing pattern, which is a behavioral pattern. It defines whether one participant needs to act on a task, many participants need to act in sequence, all the participants need to act in parallel, or participants need not act at all. The participants of the task are built using participant list building patterns, such as approval groups, management chains, and so on. The assignment of the participant is performed by a task assignment mechanism, such as static, dynamic, or rule-based assignment. In this section, we will be talking about the task assignment pattern.

The intent of the task assignment pattern is the assignment of human tasks to user(s), group(s), and/or role(s). Essentially, it's being motivated with the fact that you need to assign participants to tasks either statically, dynamically, or on derivations based on business rules. We can model and define task assignment at runtime and at design time. However, the dynamic task assignment pattern deals with the assignment of tasks at runtime.

This means the derivation of task participants will be performed at runtime when the process is executing. This pattern is very valuable in business scenarios where task assignment cannot be defined at design time.

There are various business requirements that need task assignments based on the input data of the process. As task assignment will be based on the input data of the process, task assignments will be evaluated at runtime; hence, these are termed as dynamic task assignments.

The following pattern table gives the details of the dynamic task assignment pattern:

Defining the use case

We will walk though an insurance claim process that has two tasks to be performed: the first task is verification, and the other is the validation of claimant information. The insurance claim needs to be verified by claim agents. Agents are assigned verification tasks based on the location and the business organization unit they belong to. An agent's skills in handling claim cases are also considered based on the case's sensitivity. If the case's sensitivity requires an expert agent, then an expert agent assigned to that organization unit and belonging to that specific location must be assigned.

Think of this from the perspective of having the same task being assigned to different users/groups/roles based on different criteria. For example, if the input payload has Regular as the sensitivity and EastCoast as the organization unit, then the verification task needs to be assigned to an EastCoast-Regular agent. However, if the input payload has EastCoast-Expert as the sensitivity and EastCoast as the organization unit, then the verification task needs to be assigned to an EastCoast-Expert agent. Then, we might end up with multiple swimlanes to fulfill such a task assignment model. However, such models are cumbersome and complicated, and the same activities will be duplicated, as you can see in the following screenshot:

The routing of tasks can be modeled in human tasks as well as in the BPMN process. It depends purely on the business requirements and on various modeling considerations. For instance, if you are looking for greater business visibility and if there is a requirement to use exceptional handling or something similar, then it's good to model tasks in the BPMN process itself. However, if you are looking for dynamism, abstraction, dynamic assignment, dynamic routing, rule-driven routing, and so on, then modeling task routing in human task assignment and routing is an enhanced modeling mechanism. We need an easy-to-model and dynamic technique for task assignment. There are various ways to achieve dynamic task assignment:

• Business rules
• Organization units
• Organizational roles (parametric roles)

We can use business rules to define the condition(s), and then we can invoke various seeded List Builder functions to build the list of participants. This is one way of enabling dynamic task assignment using business rules. Within an organization, departments and divisions are represented by organizational units. You can define the hierarchy of the organization units, which corresponds to your organizational structure. User(s), group(s), role(s), and organizational roles can be assigned as members to organization units. When a task belonging to a process is associated with an organization unit, then the task is available for the members of that organization unit.

So, using the scenario we discussed previously, we can define organization units and assign members to them. We can then associate the process with the organization unit, which will result in task assignment to only those members who belong to the organization that is associated with the process.

Users have various properties (attributes) defined in LDAP or in the Oracle Internet Directory (OID); however, there are cases where we need to define additional properties for the users. Most common among them is the definition of roles and organization units as properties of the user. There are cases where we don't have the flexibility to extend an enterprise LDAP/OID for adding these properties. What could be the solution in this case?

Extended user properties are the solution in such scenarios. Using an admin user, we can define extended properties for the users in the BPM workspace. Once the extended properties are defined, they can be associated with the users. Let's extend the scenario we were talking about previously. Perform the following tasks:

1. Define the agent group in the myrealm weblogic, which contains users as its members.
2. Define two organization units, one for EastCoast and another for West Coast. The users of the agent group will be assigned as members to organization units.
3. Define extended properties.
4. Associate extended properties with the users (these users are members of the agent group).
5. Define organizational roles, and create a process with a user task that builds the participant list using the organizational role defined previously.

The features of the use case are as follows:

• A validation task gets assigned to the insurance claim agent group (the ClaimAgents group)
• The assignment of the task to be used is dynamically evaluated based on the value of the organization unit being passed as input to the process
• Once the validation task is acted upon by the participants (users), the process token reaches the verification task
• The assignment of the verification task is based on the organization role (the parametric role) being defined

Assigning users to groups

In the course of achieving the use case scenario, we will execute the following tasks to define a group, organization units, extended properties, and parametric roles:

1. Log in to the Oracle weblogic console and navigate to myrealm.
2. Click on the Users & Groups tab and select the Groups tab.
3. Click on the new group with the name ClaimAgents and save the changes.
4. Click on Users; create the users (anju, rivi, and buny) and assign them to the ClaimAgents group as members.
5. Click on the following users and assign them to the ClaimAgents group: jausten, jverne, mmitch, fkafka, achrist, cdickens, wshake, and rsteven.
6. Click on Save.

We have defined and assigned some new users and some of the already existing users to the ClaimAgents group. Now, we will define the organization units and assign users as members to the organization units. Perform the following steps:

1. Log in to the Oracle BPM workspace to define the organization units.
2. Go to Administration | Organization | Organization Units.
3. Navigate to Create Organization Unit | Root Organization Unit in order to create a parent organization unit. Name it Finance.
4. Go to Create Organization Unit | Child Organization Unit in order to create child organization units. Name it EastCoastFinOrg and WestCoastFinOrg:
   • Assign the following users as members to the to the EastCoastFinOrg organization unit: Mmitch, fkafka, jverne, jausten, achrist, and anju
   • Assign the following users as members to the WestCoastFinOrg organization unit: rivi, buny, cdickens, wshake, rsteven, and jstein

Defining extended properties

The users are now assigned as members to organization units. Now, it's time to define the extended properties. Perform the following steps:

1. In the BPM workspace, navigate to Administration | Organization | Extended User Properties.
2. Click on Add Property to define the extended properties, which are as follows:
   

   Property Name	Value
   Sensitivity	Expert, regular
   Location	FL, CA, and TX

3. Add Users should be clicked on to associate the properties of users in the Map Properties section on the same page, as shown previously.
4. Use the following mapping to create the map of extended properties and users:
   

   User Name	Sensitivity	Location
   mmitch	Regular	FL
   fkafka	Regular	FL
   jverne	Regular	FL
   jausten	Expert	FL
   achrist	Expert	FL
   anju	Expert	FL
   rivi	Expert	CA
   buny	Expert	CA
   cdickens	Regular Unlock access to the largest independent learning library in Tech for FREE! Get unlimited access to 7500+ expert-authored eBooks and video courses covering every tech area you can think of. Renews at €14.99/month. Cancel anytime START FREE TRIAL	CA
   wshake	Regular	CA
   rsteven	Regular	CA
   jstein	Expert	CA

Defining the organization role

We will define the organizational role (the parametric role) and use it for task assignment in the case/BPM process. The organizational role (parametric role) as task assignment pattern is used for dynamic task assignment because users/roles are assigned to the parametric role based on the evaluation of the condition at runtime. These conditions are evaluated at runtime for the determination of users/roles based on organization units and extended properties. Perform the following steps:

1. Go to Administration | Organization | Parametric Roles.
2. Click on Create Parametric Role to create a role and name it AgentRole.
3. Click on Add Parameter to define the parameters for the parametric role and name them as Sensitivity of string type and Location of string type.
4. You can find the Sensitivity and Location extended properties in the Add Condition drop-box.
5. Select Grantees as Group; browse and select the ClaimAgents group from the LDAP.
6. Select Sensitivity and click on the + sign to include the property in the condition. For the sensitivity, use the Equals operator and select the parametric role's input parameter from the drop-down list. This parameter will be listed as $Sensitivity.
7. Similarly, select $Location and click on the + sign to include the property in the condition. For the location, use the Equals operator and select the parametric role's input parameter from the drop-down list. This parameter will be listed as $Location. This is shown in the following screenshot:

   

8. Click on Save to apply the changes.

   As we can see in the preceding screenshot, the organization unit is also available as a property that can be included in the condition.

We have configured the parametric role with a specific condition. The admin can log in and change the conditions as and when the business requires (changes at runtime, which bring in agility and dynamism).

Implementing the BPMN process

We can create a BPM process which has a user task that builds a participant's list using the parametric role, as follows:

1. Create a new BPM project with the project name as DynamicTaskAssignment.
2. Create the composite with a BPMN component.
3. Create an asynchronous BPMN process and name it as VerificationProcess.
4. Create a business object, VerificationProcessBO, based on the InsuranceClaim.xsd schema.

   The schema (XSD) can be found in the DynamicTaskAssignment project in this article. You can navigate to the schemas folder in the project to get the XSD.

5. Define the process input argument as VerificationProcessIN, which should be based on the VerificationProcessBO business object.
6. Similarly, define the process output argument as VerificationProcessOUT, based on VerificationProcessBO.
7. Define two process data objects as VerificationProcessINPDO and VerificationProcessOUTPDO, which are based on the VerificationProcessBO business object.
8. Click on the message start event's data association and perform the data association as shown in the following screenshot. As we can see, the process input is assigned to a PDO; however, the organization unit element from the process input is assigned to the predefined variable, organizationUnit. This is shown in the following screenshot:

   

The validation task is implemented to demonstrate dynamic task assignment using multilevel organization units. We will check the working of this task when we perform the test. Perform the following steps:

1. Drag-and-drop a user task between the message start event and the message end event and name it ValidationTask.
2. Go to the Implementation tab in the user task property dialog and click on Add to create a human task; name it ValidationTask.
3. Enter the title of the task with outcomes as Accept and Reject.
4. Let the input parameter for ValidationTask be VerificationProcessINPDO.
5. Click on OK to finish the task configuration. This will bring you back to the ValidationTask property dialog box.
6. Perform the necessary data association.
7. Click on ValidationTask.task to open the task metadata, and go to the Assignment section in the task metadata.
8. Click on the Participant block. This will open the participant type dialog box.
9. Select the Parallel Routing Pattern.
10. Select the list building pattern as Lane Participant ( the current lane).
11. For all other values, use the default settings.
12. Click on Save All.

Now, we will create a second task in the same process, which will be used to demonstrate dynamic task assignment using the organization role (the parametric role). Perform the following steps:

1. Drag-and-drop a user task between Validation Task and the message end event in the verification process and name it as Verification Task.
2. Go to the Implementation tab in the user task property dialog and click on Add to create a human task.
3. Enter the title of the task as Verification Task, with the Accept and Reject outcomes.
4. Let the input parameter for the Verification Task be VerificationProcessINPDO.
5. Click on OK to finish the task configuration. This will bring you back to VerificationTask property dialog.
6. Click on VerificationTask.task to open the task metadata and go to the Assignment section in the task metadata.
7. Click on the Participant block. This will open the Participant Type dialog box.
8. Select parallel routing pattern.
9. Select list building pattern as Organization Role. This is shown in the following screenshot:

   

Enter the name of the organizational role as AgentRole, which is the organizational role we have defined previously:

1. Along with the organizational role, enter the input arguments for the organizational role.
2. For the Sensitivity input argument of the parametric role, use the XPath expression to browse the input payload and select Sensitivity Element, as shown previously. Similarly, for the Location argument, select State Element from the input payload.
3. Click on Save All.

   This article contains downloads for DynamicTaskAssignment, which we have already created to facilitate verification. If you have not created the project by following the steps mentioned previously, you can use the project delivered in the download.

4. Deploy the project to the weblogic server.
5. Log in to the BPM workspace as the admin user and go to Administrator | Organization units.
6. Click on roles to assign the ClaimAgents group to the DynamicTaskAssignmentPrj.ClaimAgents role.
7. Click on Save.

Testing the dynamic task assignment pattern

Log in to the EM console as an admin user to test the project; however, you can use any tool of your choice to test it. We can get the test data from the project itself. Navigate to DynamicTaskAssignment | SOA | Testsuites | TestData12c.xml to find the test data file.

Use the TestData.xml file if you are going to execute the project in the 11g environment. The test data contains values where the sensitivity is set to Expert, organization unit is set to Finance/EastCoastFinOrg, and state is set to CA. The following are the test results of the validation task:

Note that if you pass the organization unit as Finance, then all the users belonging to the finance organization's child organization will receive the task. However, if you pass the organization unit as Finance/EastCoastFinOrg (EastCoastFinOrg is a child organization in the finance parent organization), then only those users who are in the EastCoastFinOrg child organization will receive the task.

The process flow will move from the validation task to the verification task only when 50 percent of the participants act on the validation task, as parallel routing pattern is defined with the voting pattern of 50 percent.

The following are the test results for Verification Task:

Based on the extended properties mapping, the verification task will get assigned to the users buny, rivi, and jstein.

Addressing known issues

What if the users are derived based on the evaluation of dynamic conditions? To address this, Oracle BPM offers rules that can be defined in the BPM workspace. We will extend the use case we have defined. When we execute the verification process, the verification task is assigned to the buny, rivi, and jstein users. How will you address a situation where the user, buny, wants the task to be reassigned or delegated to someone when he is in training and cannot act on the assigned tasks? Perform the following steps:

1. Log in to the Oracle BPM workspace as the user (buny) for whom we want to set the preference.
2. Go to Preferences | Rules, as shown in the following screenshot:

   

3. Click on + to create a new rule.
4. Enter the name of the rule as TrainingRule.
5. Specify the rule condition for the use case user (buny). We have defined the rule condition that executes the rule when the specified dates are met and the rule is applicable to all the tasks:
   • Specify the dates (Start Date and End Date) between which we want the rule to be applicable. (These are the dates on which the user, buny, will be in training).
   • Define the rule condition either by selecting all the tasks or by specifying matching criteria for the task. Hence, when the task condition is evaluated to True, the rule gets executed.
6. Reassign the task to the jcooper user when the rule gets evaluated to True.

The rule action constitutes of task reassignment or delegation, or we can specify a rule that takes no action. The rule action is to change task assignment or to allow someone else to perform on behalf of the original assignee, as described in the following points:

• Select reassignment if you want the task to be assigned to another assignee, who can work on the task as if the task was assigned to him/her
• Select delegation if you want the assignee to whom the task is delegated to work on behalf of the original assignee

Execute the DynamicTaskAssignment project to run the verification process. When the verification task gets executed, log in to the EM console and check the process trace. As we can see in the following screenshot, the task gets reassigned to the jcooper user. We can log in to the BPM workspace as the jcooper user and can also verify the task in the task list. This is shown in the following screenshot:

There's more

The dynamic task assigned pattern brings in dynamism and agility to the business process. In the preceding use case, we have passed organization unit as the process input parameter. However, with Oracle BPM 12c, we can define business parameters and use them to achieve greater flexibility. The business parameters allow business owners to change the business parameter's value at runtime without changing the process, which essentially allows you to change the process without the inclusion of IT. Basically, business parameters are already used in the process and they are driving the process flow. Changing the value of business parameters at runtime is like changing the process flow at execution.

For the preceding use case, the insurance input schema (parameter) has an organization unit that is passed when invoking the process. However, what if there are no placeholders to pass the organization unit in the input parameter? We can define a business parameter in JDeveloper and assign the value to the organization unit. This is shown in the following screenshot:

1. Perform the following steps to deploy the project. Open JDeveloper 12c and expand the project to navigate to Organization | Business Parameters.
2. Define a business parameter with the name ORGUNIT and of the type String; enter a default value and save the changes.
3. Go to the process message start event and navigate to the Implementation tab.
4. Click on data association and assign business parameters to the predefined variable (organization unit). Save and deploy the project.

Using the shown mechanism, a developer can enable business parameters; technically, the BPMN engine executes the following function to get the business parameter value:

bpmn:getBusinessParameter('Business Parameter')

Similarly, a process analyst can click on the BPM composer application and bring about changes in the process to define business parameters and changes in the process. Process asset manager (PAM) will take care of asset sharing and collaboration.

Business owners can log in to the BPM workspace application and change the business parameters by navigating to the following path to edit the parameter values to drive/modify the process flow:

Administration | Organization | Business Parameter

Strategic alignment pattern

BPMN needs a solution to align business goals, objectives, and strategies. It also needs a solution to allow business analysts and function/knowledge workers to create business architecture models that drive the IT development of a process, which remains aligned with the goals and objectives. Oracle BPM 12c offers business architecture, a methodology to perform high-level analysis of business processes. This methodology adopts a top-down approach for discovering organizational processes, defining goals and objectives, defining strategies and mapping them to goals and objectives, and reporting the BA components. All these details are elaborated exclusively with use cases and demo projects in the book. The following pattern table highlights facts around the strategic alignment pattern:

Summary

In this article, we have just introduced the alignment pattern. However, in the book, alignment pattern is covered in detail. It shows how IT development and process models can be aligned with organization goals. While performing alignments, we will learn enterprise maps, strategy models, and value chain models. We will discover how models are created and linked to an organization. Capturing the business context showcases the importance of documentation in the process model phase. Different document levels and their methods of definition are discussed along with their usage. Further, we learned how to create different reports based on the information we have documented in the process, such as RACI reports and so on. The process player demonstration showcased how process behavior can be emulated in a visual representation, which allows designers and analysts to test and revise a process without deploying it. This infuses a preventive approach and also enables organizations to quickly find the loopholes, making them more responsive to challenges. We also elaborated on how round trips and business-IT collaboration facilitates the storing, sharing, and collaboration of process assets and business architecture assets. While doing so, we witnessed PAM and subversion as well as learnt versioning, save/update/commit, difference and merge, and various other activities that empower developers and analysts to work in concert.

In this book, we will learn various patterns in a similar format. Each pattern pairs the classic problem/solution format, which includes signature, intent, motivation, applicability, and implementation; the implementation is demonstrated via a use case scenario along with a BPMN application, in each chapter. It's a one-stop title to learn about patterns, their applicability and implementation, as well as BPMN features.

Resources for Article:

Further resources on this subject:

• Oracle GoldenGate- Advanced Administration Tasks - I [article]
• Oracle B2B Overview [article]
• Oracle ADF Essentials – Adding Business Logic [article]