code: public static RuntimeInstance getInstance() {
  		RuntimeInstance result = RuntimeInstance.CACHED_DELEGATE.get();
  		if (result != null) {
  			return result;
  		}
  		synchronized(RuntimeInstance.CACHED_DELEGATE) {
  			result=RuntimeInstance.CACHED_DELEGATE.get();
  			if(result==null) {
  				RuntimeInstance.CACHED_DELEGATE.set(findDelegate());
  				result=RuntimeInstance.CACHED_DELEGATE.get();
  			}
  			return result;
  		}
  	}
docs: Obtain a {@code RuntimeInstance} instance. If an instance had not already
  been created and set via {@link #setInstance(RuntimeInstance)}, the first
  invocation will create an instance which will then be cached for future
  use.
  
  <p>
  The algorithm used to locate the RuntimeInstance subclass to use consists
  of the following steps:
  </p>
  <ul>
  <li>
  If a resource with the name of
  {@code META-INF/services/org.centeropenmiddleware.almistack.poc.clients.spi.RuntimeInstance} exists, then
  its first line, if present, is used as the UTF-8 encoded name of the
  implementation class.</li>
  <li>
  If the $java.home/lib/poc-business-logic.properties file exists and it is readable by
  the {@code java.util.Properties.load(InputStream)} method and it contains
  an entry whose key is {@code org.centeropenmiddleware.almistack.poc.clients.spi.RuntimeInstance}, then the
  value of that entry is used as the name of the implementation class.</li>
  <li>
  If a system property with the name
  {@code org.centeropenmiddleware.almistack.poc.clients.spi.RuntimeInstance} is defined, then its value is
  used as the name of the implementation class.</li>
  <li>
  Finally, a default implementation class name is used.</li>
  </ul>
  
  @return an instance of {@code RuntimeInstance}.