Package org.cometd.oort

Class OortMap.DeltaListener<K,​V>

  • Type Parameters:
    K - the key type
    V - the value type
    All Implemented Interfaces:
    EventListener, OortObject.Listener<ConcurrentMap<K,​V>>
    Enclosing class:
    OortMap<K,​V>
    public static class OortMap.DeltaListener<K,​V>
extends Object
implements OortObject.Listener<ConcurrentMap<K,​V>>

    An implementation of OortObject.Listener that converts whole map events into OortMap.EntryListener events.

    For example, if an entity map:

     {
     key0: value0,
     key1: value1,
     key2: value2
 }

    is replaced by a map:

     {
     key0: value0,
     key1: valueA,
     key3: valueB
 }

    then this listener generates two "put" events with the following entries:

     (key1, value1, valueA)
 (key3, null, valueB)

    and one "remove" event with the following entry:

     (key2, value2, null)

    Note that no event is emitted for key0; the values for key0 of the two maps are tested via Object.equals(Object) and if they are equal no event is generated.