Class EventSubject

  • All Implemented Interfaces:

    public class EventSubject
    extends Object
    implements Serializable
    This class encapsulates the String that is used to identify the subject that a listener is interested in. Using plain Strings causes several severe problems:
    • it's easy to misspell a subject, leading to undesired behaviour at runtime that is hard to debug.
    • in systems with many different subjects there is no safeguard for defining the same subject twice for different purposes. This is especially true in a distributed setting.
    See Also:
    Serialized Form
    • Constructor Detail

      • EventSubject

        protected EventSubject​(String fullSubjectName)
        Protected constructor for new subjects.
        fullSubjectName - the name of the new subject to be created
    • Method Detail

      • getSubject

        public static EventSubject getSubject​(Class<?> subjectOwner,
                                              String subjectName)
        Returns an event subject identified by the given owner and subject name.
        subjectOwner - the Class used for uniquely identifying this subject
        subjectName - a String used as name, e.g. "MyEventTopic"
        IllegalArgumentException - if subjectOwner/subjectName are null or subjectName is empty.
      • hashCode

        public int hashCode()
        hashCode in class Object
      • getSubjectName

        public String getSubjectName()