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## org.apache.cayenne
Interface DataChannelListener

    public interface DataChannelListener

A listener of `DataChannel` lifecycle events. Changes related to an event are attached as a GraphDiff. If a listener needs to process these changes, the easiest way to do that is via GraphChangeHandler "visitor":

       public void graphChanged(GraphEvent event) {
           GraphChangeHandler handler = ..;
           event.getDiff().apply(handler);
       }

Since:
  1.2
Author:
  Andrus Adamchik

Method Summary
`void` | `graphChanged(GraphEvent event)` Notifies implementing object of the changes that were performed to the object graph externally, not by one of the channel ObjectContexts.
`void` | `graphFlushed(GraphEvent event)` Notifies implementing object that one of the channel ObjectContexts flushed its changes to the channel.
`void` | `graphRolledback(GraphEvent event)` Notifies implementing object that one of the channel ObjectContexts initiated a rollback.

Method Detail

### graphChanged

    void graphChanged(GraphEvent event)

  Notifies implementing object of the changes that were performed to the object graph externally, not by one of the channel ObjectContexts.

### graphFlushed

    void graphFlushed(GraphEvent event)

  Notifies implementing object that one of the channel ObjectContexts flushed its changes to the channel.

### graphRolledback

    void graphRolledback(GraphEvent event)

  Notifies implementing object that one of the channel ObjectContexts initiated a rollback.

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