Named ProcessEnginePlugins

Because ProcessEngineConfiguration(Impl) offers many setters that are not grouped in an OOD pattern, we started to use ProcessEnginePlugins#preInit to set our values. So for example the DataSourcePlugin has getters/setters for datasource, dbUpdate, ... , the HistoryLevelPlugin configures the history level (and maybe additional HistoryEventListeners).

We use this at K+N and the idea is to move the "Configuration" classes in the spring boot extension to the same pattern.

When the plugin is applied to the engine on startup, we get a log-entry "applied plugin 'HistoryLevelPlugin' ...". So far so good.

But: the name today is the SimpleClassName of the registered plugin. I want to control from within the plugin, what its name will be. Two reasons:

• I might have a parameterized HistoryLevelPlugin(String level). So Its useful to know, if I registered "full" or "audit". By having control over the name, I could implement what I want to see in the log.
• When using spring boot, I can register plugins just by defining available beans that implement ProcessEnginePlugin. Those beans could be anonymous, just writing `@Bean public ProcessEnginePlugin myPlugin() {}`. In these case I get a very ugly log message containing something like "plugin Plugin@12345extendedCglib...." registered, which is not very helping.

Constraint:

• we must not change the ProcessEnginePlugin interface for backward compatibility. (shame, would we use java 8, we could provide a default method )

So I propose:

• A new Interface type NamedProcessEnginePlugin, extending the existing interface by "getName()".
• extend the AbstractProcessEnginePlugin to return the class SimpleName as a default for getName()
• when the log is written, and the plugin to be registered is not a NamedProcessEnginePlugin use the existing mechanism (simple class name), if it is a named plugin, use getName()
• for engine-spring, we need an additional AbstractBeanNameAwareProcessEnginePlugin that uses springs beanName for getName() {still defaulting to SimpleClassName if not available).

So now when I add plugins, I have control if the class name, the bean name or some custom name is logged.

Wdyt?

• When the