+ * The {@link #set(Object)} method sets the current service instance for the current thread.
+ * The {@link #get()} method gets the current service instance for the current thread.
+ * The {@link #getProxy()} method gets a proxy that will delegate at runtime to the thread-specific
+ * instance. The result from this method can be passed at construction of an object that will be used
+ * by multiple threads.
+ *
+ * This class is mostly used by other test tools.
+ *