Examples of org.apache.cayenne.event.EventManager

org.apache.cayenne.event.EventManager
This class acts as bridge between an Object that wants to inform others about its current state or a change thereof (Publisher) and a list of objects interested in the Subject (Listeners). @author Dirk Olmes @author Holger Hoffstaette @author Andrus Adamchik

            // check flag again in the synced block...
            if (!dbRelationshipsRefreshNeeded) {
                return;
            }


            EventManager eventLoop = EventManager.getDefaultManager();


            // remove existing relationships
            Iterator removeIt = dbRelationships.iterator();
            while (removeIt.hasNext()) {
                DbRelationship relationship = (DbRelationship) removeIt.next();
                eventLoop.removeListener(
                        this,
                        DbRelationship.PROPERTY_DID_CHANGE,
                        relationship);


                removeIt.remove();
            }


            if (this.dbRelationshipPath != null) {


                ObjEntity entity = (ObjEntity) getSourceEntity();
                if (entity == null) {
                    throw new CayenneRuntimeException(
                            "Can't resolve DbRelationships, null source ObjEntity");
                }


                try {
                    // add new relationships from path
                    Iterator it = entity.resolvePathComponents(new ASTDbPath(
                            this.dbRelationshipPath));


                    while (it.hasNext()) {
                        DbRelationship relationship = (DbRelationship) it.next();


                        // listen for changes
                        eventLoop.addListener(
                                this,
                                "dbRelationshipDidChange",
                                RelationshipEvent.class,
                                DbRelationship.PROPERTY_DID_CHANGE,
                                relationship);

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                // cache entity resolver, as we have no idea how expensive it is to query
                // it on the channel every time
                this.entityResolver = channel.getEntityResolver();


                EventManager eventManager = channel.getEventManager();


                if (eventManager != null) {
                    this.mergeHandler = new DataContextMergeHandler(this);


                    // listen to our channel events...

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    /**
     * @since 1.2
     */
    void fireDataChannelCommitted(Object postedBy, GraphDiff changes) {
        EventManager manager = getEventManager();


        if (manager != null) {
            GraphEvent e = new GraphEvent(this, postedBy, changes);
            manager.postEvent(e, DataChannel.GRAPH_FLUSHED_SUBJECT);
        }
    }

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    /**
     * @since 1.2
     */
    void fireDataChannelRolledback(Object postedBy, GraphDiff changes) {
        EventManager manager = getEventManager();


        if (manager != null) {
            GraphEvent e = new GraphEvent(this, postedBy, changes);
            manager.postEvent(e, DataChannel.GRAPH_ROLLEDBACK_SUBJECT);
        }
    }

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    /**
     * @since 1.2
     */
    void fireDataChannelChanged(Object postedBy, GraphDiff changes) {
        EventManager manager = getEventManager();


        if (manager != null) {
            GraphEvent e = new GraphEvent(this, postedBy, changes);
            manager.postEvent(e, DataChannel.GRAPH_CHANGED_SUBJECT);
        }
    }

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     */
    public static boolean listenForChannelEvents(
            DataChannel channel,
            DataChannelListener listener) {


        EventManager manager = channel.getEventManager();


        if (manager == null) {
            return false;
        }

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    protected Configuration(String domainConfigurationName) {


        // set domain configuration name
        this.setDomainConfigurationName(domainConfigurationName);


        this.eventManager = new EventManager();
    }

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    public ClientChannel(ClientConnection connection) {
        this(connection, false);
    }


    public ClientChannel(ClientConnection connection, boolean channelEventsEnabled) {
        this(connection, channelEventsEnabled, new EventManager(2));
    }

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    /**
     * Wraps GraphDiff in a GraphEvent and sends it via EventManager with specified
     * subject.
     */
    void send(GraphDiff diff, EventSubject subject, Object eventSource) {
        EventManager manager = (context.getChannel() != null) ? context
                .getChannel()
                .getEventManager() : null;


        if (manager != null) {
            GraphEvent e = new GraphEvent(context, eventSource, diff);
            manager.postEvent(e, subject);
        }
    }

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            "Raising from underlyingQueryEngine exception.",
            Util.unwindException(ex));
    }


    public void registerForDataContextEvents() {
        EventManager mgr = context.getEventManager();
        mgr.addListener(
                this,
                "dataContextWillCommit",
                DataContextEvent.class,
                DataContext.WILL_COMMIT,
                this.context);
        mgr.addListener(
                this,
                "dataContextDidCommit",
                DataContextEvent.class,
                DataContext.DID_COMMIT,
                this.context);
        mgr.addListener(
                this,
                "dataContextDidRollback",
                DataContextEvent.class,
                DataContext.DID_ROLLBACK,
                this.context);

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