Accessing a user-defined policy from a JavaCompute node

Use a JavaCompute node to query properties dynamically at run time, in user-defined policies.

1. Right-click the JavaCompute node and click Open Java to create and open a Java™ file in the Editor view, or open an existing file.
2. Create the Java class for the JavaCompute node from which you want to access the user-defined policy.
3. Add user code as shown below to the Java class to define the user-defined policy. In the example shown, a user-defined policy called MyUDCS has been defined in a policy project called PP1.

   MbPolicy myPol = getPolicy("UserDefined", "{PP1}:MyUDCS");
   

4. Use the following code to access the policy.

   
   if (myPol != null) {
   System.out.println("Found policy: "+myPol.getName());
   System.out.println(" with type: "+myPol.getType());
   System.out.println(" and properties:");
   System.out.println(" prop1: "+myPol.getPropertyValueAsString("prop1"));
   System.out.println(" prop2: "+myPol.getPropertyValueAsString("prop2"));
   System.out.println(" prop3: "+myPol.getPropertyValueAsString("prop3"));
   }

   This lookup syntax can be qualified by policy project. If no policy project is qualified, the policy project that is defined on the defaultPolicyProject property in the node.conf.yaml configuration file is used. Null is returned if either the property or the policy does not exist.

   If you created a user-defined policy, and created properties for that policy, you can query those properties by using a Java class method that can be called from ESQL.