The example provided in the PDK is very clear. The idea is to call the shared service by adding some function in your *.py scripts.

In the PDK example, you will find a Python script call ‘action.py’ which contains all methods in order to call your shared service.

You will need only to change, the name of the shared service.

    regInfo = maestro.registry.getRegistry("sample", "1.0")        # Retrieve info on SharedService (IP) so we know where to go
    ipAddr = regInfo['ip']
    jsonResults = pcurlInvoke(ipAddr, "sample", method, sslOpts, url, str(json))       # Drive pcurl method

by

    regInfo = maestro.registry.getRegistry("poolmanager", "1.0")        # Example to call the poolmanager .
    ipAddr = regInfo['ip']
    jsonResults = pcurlInvoke(ipAddr, "poolmanager", method, sslOpts, url, str(json))       # Drive pcurl method

In this article, I explain how to create a simple client for the shared service created in the article Pattern-type (Part 13): How to create shared services for IBM SmartCloud Application Workload Service.
We can call APIs defined by a shared service either from an OSGI component or from python scripts. In this article I will demonstrate the OSGI component method.
We will use as base plugin, the Master-Slave plugin we developed along this education series.
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This article is also valid for IBM SmartCloud Application Services!

Summary:  Reusable components provide a method by which domain experts can capture their knowledge of an enterprise system into reusable components that can be easily consumed by users creating new application patterns. This article describes the use of reusable components and application templates within IBM® PureApplication™ System. Learn about processes that can be used to accelerate the development life cycle and provide consistent implementations across deployments. Continue Reading ->

I read this article on developerWorks: Deploying into the cloud with the IBM Application Pattern for Java which I found very interesting. It explains how to deploy a Java application in SCAS. The author demonstrates how to setup a Tomcat environment and how to install its application on it.
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I wrote an article on: http://expertintegratedsystemsblog.com 
Please read this to setup your development environment: How to setup your SCAS/IWD/PureApp plugin development environment?

IBM PureApplication can provide you out of the box a number of pattern-types; you can also upload new pattern-types at IBM PureSystems Center but what about if you want to create your own pattern-type that describe your own application environment!

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The provided Java API has a number of interfaces, one of them is the PostProvisioner on which I already wrote a blog (Pattern-type (Part 11): Add a post processor to a deployment) another one is the ServiceProvisioner. With this interface you can insert parameter value in the vm topology. Continue reading →