Dependency Injection for Plugins
If you want to share a single instance of a certain class between plugin
      extensions and custom operations (to prevent instances from being repeated), you can declare a
        
    <context> element in your plugin.xml
      file:<context class="my.package.ContextClass"/>Important: 
    The 
my.package.ContextClass class
      should have a no-arguments constructor that will be called when the class is
      instantiated.This will result in an instance being automatically generated. You can
      access this instance in an extension class by defining a field of that type and annotated with
      the 
    ro.sync.exml.plugin.PluginContext
      annotation:@PluginContext
ContextClass contextInstance;The defined field is automatically populated with the single instance.
