code: public ServiceFuture<ServiceEndpointPolicyInner> getByResourceGroupAsync(String resourceGroupName, String serviceEndpointPolicyName, String expand, final ServiceCallback<ServiceEndpointPolicyInner> serviceCallback) {
          return ServiceFuture.fromResponse(getByResourceGroupWithServiceResponseAsync(resourceGroupName, serviceEndpointPolicyName, expand), serviceCallback);
      }
docs: Gets the specified service Endpoint Policies in a specified resource group.
  
  @param resourceGroupName The name of the resource group.
  @param serviceEndpointPolicyName The name of the service endpoint policy.
  @param expand Expands referenced resources.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object