|Oracle® Fusion Middleware Developer's Guide for Oracle WebCenter
11g Release 1 (126.96.36.199.0)
Part Number E10148-12
This chapter describes how to integrate the Worklist service into your application. Worklists enable users to view and take action on all tasks and notifications from a BPEL (Business Process Execution Language) server all in one place.
This chapter includes the following sections:
For information about managing and using the Worklist service, see:
The Worklist service enables you to show Business Process Execution Language (BPEL) Worklist items assigned to the currently authenticated user. The BPEL Worklist items are open BPEL tasks from one or more BPEL Worklist Repositories to which your application is connected. The Worklist displays BPEL Worklist items that are a result of a task invoked as part of a BPEL Workflow process, or are a result of a message being sent to the Worklist channel on the Oracle User Messaging Service.
This section contains the following subsections:
The Worklist service provides a personal, at-a-glance view of business processes that require your users' attention. These can include a request for document review or other types of business processes that come directly from your enterprise applications.
Worklist items come from a variety of sources. Some Worklist items are kicked off by events that are associated with an externally defined workflow. A workflow maps the route an item follows once an event kicks off. This type of workflow is defined in a Worklist BPEL server, such as Oracle BPM Worklist.
Messages, alerts, and notifications might also come from the User Messaging Service (UMS). The Worklist task flow includes a control for accessing messaging preferences on this server. Use these controls to specify the channels over which to receive Oracle User Messaging Service messages and to define messaging filters.
See Also:Oracle Fusion Middleware User's Guide for Oracle WebCenter Spaces for more information about the service at runtime.
To use the Worklist service, you must have a BPEL server installed. For information on installing BPEL for the Worklist service, see the "Back-End Requirements for the Worklist Service" in the Oracle Fusion Middleware Installation Guide for Oracle WebCenter.
For the Worklist to properly function, it must reside on a secured page, as the service uses the currently authenticated user to access the BPEL server. If the page or application that contains the Worklist service is not secured, you will encounter exception errors.
At runtime, the Worklist task flow fetches latest Worklist workflow items from BPEL workflows configured in the BPEL server. For more information, see the chapter "Working with the Worklist Service" in Oracle Fusion Middleware User's Guide for Oracle WebCenter Spaces.
To get a list of the items assigned to a user, the Worklist service uses the WebService access function of the public BPM client API. The Worklist service uses SAML authentication to authorize the logged-in user to fetch the list of latest items from the BPEL repository. The Worklist service fetches 25 most recent items for each Worklist connection, and determines the order of these items by using a predicate on the
TaskQueryService API. For more information, see "Building a Custom Worklist Client" in Oracle Fusion Middleware Developer's Guide for Oracle SOA Suite.
Figure 46-1 shows the Worklists service at runtime.
Figure 46-1 Worklist Service at Runtime
This section describes how to set up a connection for the Worklist service and add the task flow to your WebCenter Portal application.
This section contains the following subsections:
To use the Worklist service, you must establish a connection to one or more BPEL servers. This section describes these connections and how to create them in a WebCenter Portal application.
The Worklist service relies on a BPEL server. Once you create a connection using the Create Worklist Connection dialog, the connection is registered in your application's
connections.xml and referenced in your application's
adf-config.xml. You can see the connections to your BPEL Worklist Repositories in the Application Resources pane.
Note:While you can set up the connections to back-end servers at design time in Oracle JDeveloper, you can later add, delete, or modify connections in your deployed environment using Enterprise Manager Fusion Middleware Control. For more information, see the Oracle Fusion Middleware Administrator's Guide for Oracle WebCenter.
The Worklist service provides a task flow that you can add to your application at design time or at runtime. Before you can run the task flow, you create a connection from your application to a BPEL server.
Note:The application you use must be prepared for service consumption. For information about doing so, see Chapter 7, "Preparing Your Application for Oracle WebCenter Services."
To set up the connection for the Worklist service:
In the Application Resources panel for your application, right-click Connections, then choose New Connection> Worklist.
In the Create Worklist Connection dialog, choose whether to create the connection in the Application Resources (only the current application can use this connection) or IDE Connections (other applications you create can use the same connection).
In the Connection Name field, enter a name for your connection. This name will be used as the display name of the Worklist server.
Note:At runtime, when users view their worklist items, they can choose to group the items by "Worklist Server." The Worklist Server name used is the name you enter in the Connection Name field.
In the URL field, enter the location of your BPEL/SOA server, such as
http://bpel.example.com. This is the URL for the managed server running the SOA processes.
Select the SAML Token Policy URI to use for this server (Figure 46-2).
SAML (Security Assertion Markup Language) is an XML-based standard for passing security tokens defining authentication and authorization rights. An attesting entity (that already has trust relationship with the receiver) vouches for the verification of the subject by method called sender-vouches. Options available are:
SAML Token Client Policy (oracle/wss10_saml_token_client_policy) - Select to verify your basic configuration without any additional security. This is the default setting.
SAML Token With Message Client Policy (oracle/wss10_saml_token_with_message_protection_client_policy) - Select to increase the security using SAML-based BPEL Web Services. If selected, you must configure keys stores both in your WebCenter Portal application and in the BPEL application. For more information about this configuration, see the "Configuring Policies" in the Oracle Application Server Web Services Security Guide.
Figure 46-2 Create Worklist Connection Dialog
To enable advanced settings, select Advanced:
In the Link URL field, specify the URL used to link to the BPEL server. Only required if it is different to the BPEL SOAP URL, for example, when SSO or HTTPS is configured. Use the format:
This URL is used to build SSO- or HTTPS-enabled URL links to worklist items. Whereas the URL property of the Worklist service is used to access the BPEL Task Query Service, which for performance reasons does not need to go through HTTPS or an SSO server.
In the Recipient Key Alias field, enter the recipient key alias to be used for message protected SAML policy authentication. Only required when the BPEL server connection is using a SAML token policy for authentication and the application's Worklist service is using multiple BPEL server connections. For information about working with recipient key alias and WS-security, see the chapter "Configuring WS-Security" in Oracle Fusion Middleware Administrator's Guide for Oracle WebCenter.
Click Test Connection to validate the URL.
The new connection displays in the Application Resources panel under Connections.
This section describes the Worklist task flow and how to add it to your application.
There is one task flow associated with the Worklist service, called "Worklist." You can find this task flow in the WebCenter Services Catalog in the Resource Palette.
You can add the Worklist service to your application before or after you have created your connection. However, you must set up your connection before you run the service.
To add the Worklist task flow to your application:
Follow the steps in Section 7.2.1, "How to Prepare Your Application to Consume Services" to implement security and create a customizable page in your application.
Open the page where you wish to add the Worklist task flow.
In the Resource Palette, in the My Catalogs pane, open the WebCenter Services Catalog, then open the Task Flows folder.
Drag the worklist task flow onto the desired region on the page, then choose Region from the pop-up list. The task flow displays on the page. For example, in the Source view, you will see Figure 46-3.
Figure 46-3 Worklist Task Flow in the Page Source
Save your project, then run your page to a browser. The Worklist service displays in your browser.
The Worklist service displays the tasks for the currently authenticated user. So, for users to store and retrieve Worklist tasks on the BPEL server from your application, you must set up security on the application (as described in Section 188.8.131.52, "Implementing Security for Services"). The user names need to either exist in a shared user directory (LDAP), or set up similarly (same user name) on both the WebCenter Portal application and the BPEL Server. For example, if the user
rsmith needs to use the Worklist service in your WebCenter Portal application to store and retrieve tasks from the BPEL server, you must ensure that the user
rsmith exists on both the BPEL server and within your application.
To enable users to perform actions on assigned Worklist tasks, you can configure SSO. If you do not configure SSO, the users will be prompted to log into the Worklist Task Details page on the BPEL server. For more information, see the Oracle Containers for J2EE Security Guide.
Only authenticated users can view Worklist tasks on the BPEL server to which they have permissions to view. If the application end user does not supply appropriate credentials, or if the page containing the Worklist service is not secured, she will not see any Worklist items stored on the BPEL server and exception errors may occur.
The Worklist service collates all the Worklist items for the authenticated user from all connections in your application defined for the Worklist service. You can use the create connection method described in Section 184.108.40.206, "How to Set Up Connections for the Worklist Service" to create additional connections, or right-click the connection name in the Application Resources list and choose Delete to remove a connection.