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Working with Enqueue LocksLocate this document in the navigation structure

Use

Applications communicate with the Enqueue Server through the Application Locking Service and need access to certain resources of this service at design time and at runtime.

  • To compile your projects at design time, you need access to the following libraries: applocking.jar

    frame.jar

    exception.jar

    For more information about how you set the Java class path and compile the project in the SAP NetWeaver Developer Studio, refer to the “SAP NetWeaver Developer Studio Basics” documentation.

  • At runtime, applications need a hard application reference to the Application Locking Service. To declare the reference for J2EE applications, you use the application-j2ee-engine.xml descriptor. For more information about how you can set application references using the SAP NetWeaver Developer Studio, refer to Editing Runtime References in the application-j2ee-engine.xml .

To lock application components programmatically, you acquire locks according to the agreed locking protocol and use the TableLocking API or LogicalLocking API .