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The BPEL Designer Palette Elements
When you drag an element from the Palette, you can see placeholders showing acceptable drop points for this element. These drop points reflect the construction logic of the diagram. As you move the mouse pointer on the diagram, a placeholder that is active for the current mouse pointer position is highlighted. Align the dragged element with one of the placeholders and release the mouse button to insert the element.
Some placeholders are always present on the diagram marking the places where it is necessary to insert an activity so that the BPEL process is valid. These are the places inside container elements, for example the If element.
Both input and output variables can be created or browsed through this dialog.
In the Property Editor dialog box, you can either create a variable or use an existing variable to hold input and output data. Click the Create button to create a variable for the Invoke element, and click Browse to choose an existing variable.
Note that when you click the Browse button, the Input Variable Chooser or the Output Variable Chooser dialog boxes opens. In these dialog boxes, a checkbox with the option to show variables with appropriate types appears. This checkbox restricts the list of available variables to those which are of the proper type for the activity you are configuring. In this way the Design view helps you develop valid BPEL code.
The tab shows:
You can also edit some of the element's properties in the Properties window. To open the window, right-click the Receive element and choose Properties or choose Window → Properties (Ctrl-Shift-7) from the main menu. You can edit the information by clicking on the ellipsis button. You cant edit the shadowed information from this window, to change it open the property editor as described above.
The tab shows:
This activity is used in a synchronous (request/response) operation, and specifies the same partner, port type and operation as the Receive activity that invoked the process.
You can also edit some of the element's properties in the Properties window. To open the window, right-click the Receive element and choose Properties or choose Window → Properties (Ctrl-Shift-7) from the main menu.
You can edit the information by clicking on the ellipsis button. You cant edit the shadowed information from this window, to change it open the property editor as described above.
The tab shows:
The Partner Link Property Editor dialog box enables you to establish partner links for your BPEL processes.
The Partner Link Property Editor dialog box enables you to establish partner links for your BPEL processes. The Partner Link Property Editor is invoked by double-clicking a Partner Link element on the diagram, or right-clicking the Partner Link element and choosing Edit. The Partner Link Property Editor also appears when you drag the Partner Link element, a WSDL file node, or a web service node to the diagram.
With the Partner Link Property Editor, you can specify:
Further on you can choose whether to use the existing partner link type or create a new partner link type.
If the WSDL file you selected contains partner link types, the Use Existing Partner Link Type option is selected and the Partner Link Type drop-down list is populated with the partner link types found in the WSDL file. You can use one of the existing partner link types or select the Use a Newly Created Partner Link Type option to create a new partner link type.
If the WSDL file does not contain partner link types, the Use a Newly Created Partner Link Type option is selected.
You can also review and modify the Partner Link's properties in the Properties window invoked by right-clicking the element and choosing Properties.
The partner links are placed in the left and right margins of the process diagram. Service requestors are placed on the left side, service providers are placed on the right side. To define the role and to choose the appropriate side for each partner link the IDE uses the order of roles defined for the partnerLinkType in the WSDL file. The role defined first in the partnerLinkType in the WSDL file is considered to be a service role, the second defined role is considered to be the role for the requestor and callback receiver. If the roles are defined in the reverse order in the WSDL file (the callback receiver role is defined in the first place, and the service role in the second place) then you get the improper partner link layout in the BPEL process diagram, though the operation is not damaged. If a partner link appears on the wrong side you should go to the WSDL file and swap places for the role definitions in the partnerLinkType.
During the design-time of an application, you may need to configure certain services whose endpoints (addresses) are not known beforehand, or it may be necessary to change an endpoint reference while the application is running. The Dynamic Partner link feature allows you to dynamically assign an endpoint reference to the partner link. This means that you can use one partner link for subsequent calls to different web-services (provided that the services use the same interface).
Assigning an Endpoint Reference
Each partner link defines abstract information and concrete information. While abstract information, describing the web-service interface, should be static, the concrete information, such as the address and port, can be discovered and used dynamically.
To assign a new endpoint reference to a partner link you can use the standard Assign activity and the BPEL Mapper.
The EPR information can be provided in several different ways:
Each of these options is explained in more detail in the advanced section of this book. For more information on each of these alternatives, see Using Dynamic Partner Links and Dynamic Addressing.
If you use an incoming message, an EPR schema should be defined as a part of the message in WSDL. To assign the EPR to a partner link, use the message variable.
See Using Dynamic Partner Links and Dynamic Addressing for more use cases and further information.
Double-click the Assign activity on the diagram to open Mapper view of the activity. If this window is not visible, you can invoke it manually, by choosing Window → Other → BPEL Mapper from the main menu.
The Empty element can be used when someone else will be implementing a business process, or when the activities within a flow activity need to be synchronized.
Double-click the Wait element on the diagram to open Mapper view of the activity.
The options are:
There are no properties to be defined for the Rethrow element, as it rethrows the fault caught by the fault handler.
Note: BPEL runtime does not support Exit within the Flow and On Alarm elements, or within the On Event child of the Event Handler element.
The Compensate activity causes compensation of all scopes immediately enclosed in the scope containing the fault handler, compensation handler, or termination handler with the Compensate activity.
The CompensateScope activity can compensate one specified Scope or Invoke element, enclosed in a scope that contains the handler with the CompensateScope activity, by invoking the compensation handler of the Scope or Invoke element.
If none of the branches evaluates to true, then the Else path is chosen. If the Else branch is not explicitly specified, this branch is considered to contain an Empty activity. The If activity is complete when the activity of the selected branch completes.
Note: the While element first checks the validity of the condition and then executes the iterative activity. Conversely, the RepeatUntil element first executes the activity and then checks the validity of the condition.
Note: the RepeatUntil element first executes the iterative activity and then checks the validity of the condition. Conversely, the While element first checks the validity of the condition and then executes the activity.
The Flow activity is a structured activity, containing other activities separated into individual control paths or branches. You can embed as many paths in the activity as you want, and they will all be executed simultaneously.
During execution, each path is executed concurrently, and the activities on each are executed in the order in which they appear, unless they are the source of a link. When the activities are the source of a link, the condition of the link and the join condition of the activity must be evaluated. If the link conditions that lead to an activity conflict with those of its join condition, then a fault is thrown on that activity.
To add a new child activity, drag and drop an element from the Palette onto the immediately available next or previous activity placeholder.
The name of a variable must be unique among the names of all variables defined within the same Scope.
By default, the Create New Variable dialog box only shows those files that have already been referenced in the process. However, the project may contain other WSDL and XSD files which have not yet been imported into the process. If you select a type for the new variable that is defined in a non-imported file, the IDE will automatically add the required import to the BPEL process.
You can also add variables from the the Navigator Window window. To add a variable, select BPEL Logical View in the Navigator, expand your BPEL Module project's node, right-click the Variables node and choose Add Variable.
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