Examples of org.apache.cayenne.graph.GraphDiff

org.apache.cayenne.graph.GraphDiff
Represents a change in an object graph. This can be a simple change (like a node property update) or a composite change that consists of a number of smaller changes. @since 1.2

        processIndirectlyModifiedIDs(event.getIndirectlyModifiedIds());


        // TODO: andrus, 3/28/2006 - 'SnapshotEventDecorator' serves as a bridge (or
        // rather a noop wrapper) between old snapshot events and new GraphEvents. Once
        // SnapshotEvents are replaced with GraphEvents (in 2.0) we won't need it
        GraphDiff diff = new SnapshotEventDecorator(event);


        ObjectContext originatingContext = (event.getPostedBy() instanceof ObjectContext)
                ? (ObjectContext) event.getPostedBy()
                : null;
        context.fireDataChannelChanged(originatingContext, diff);

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                        changes,
                        syncType);


        callbackAction.applyPreCommit();


        GraphDiff result;
        switch (syncType) {
            case DataChannel.ROLLBACK_CASCADE_SYNC:
                result = onSyncRollback(originatingContext);
                break;
            // "cascade" and "no_cascade" are the same from the DataDomain

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     * @since 1.2
     */
    @Override
    public void rollbackChangesLocally() {
        if (objectStore.hasChanges()) {
            GraphDiff diff = getObjectStore().getChanges();


            getObjectStore().objectsRolledBack();
            fireDataChannelRolledback(this, diff);
        }
    }

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     */
    @Override
    public void rollbackChanges() {


        if (objectStore.hasChanges()) {
            GraphDiff diff = getObjectStore().getChanges();


            // call channel with changes BEFORE reverting them, so that any interceptors
            // could record them


            if (channel != null) {

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        int syncType = cascade
                ? DataChannel.FLUSH_CASCADE_SYNC
                : DataChannel.FLUSH_NOCASCADE_SYNC;


        ObjectStore objectStore = getObjectStore();
        GraphDiff parentChanges = null;


        // prevent multiple commits occurring simultaneously
        synchronized (objectStore) {


            ObjectStoreGraphDiff changes = objectStore.getChanges();

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            GraphDiff changes,
            int syncType) {


        changes = diffCompressor.compress(changes);


        GraphDiff replyDiff = (GraphDiff) send(new SyncMessage(
                originatingContext,
                syncType,
                changes), GraphDiff.class);


        if (channelEventsEnabled) {
            EventSubject subject;


            switch (syncType) {
                case DataChannel.ROLLBACK_CASCADE_SYNC:
                    subject = DataChannel.GRAPH_ROLLEDBACK_SUBJECT;
                    break;
                case DataChannel.FLUSH_NOCASCADE_SYNC:
                    subject = DataChannel.GRAPH_CHANGED_SUBJECT;
                    break;
                case DataChannel.FLUSH_CASCADE_SYNC:
                    subject = DataChannel.GRAPH_FLUSHED_SUBJECT;
                    break;
                default:
                    subject = null;
            }


            if (subject != null) {


                // combine message sender changes and message receiver changes into a
                // single event
                boolean sentNoop = changes == null || changes.isNoop();
                boolean receivedNoop = replyDiff == null || replyDiff.isNoop();


                if (!sentNoop || !receivedNoop) {
                    CompoundDiff notification = new CompoundDiff();


                    if (!sentNoop) {

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    public GraphDiff onSync(
            ObjectContext originatingContext,
            GraphDiff changes,
            int syncType) {


        GraphDiff diff = getParentChannel().onSync(null, changes, syncType);
        return new ClientReturnDiffFilter(getEntityResolver()).filter(diff);
    }

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    public void graphChanged(GraphEvent event) {
        // parent received external change
        if (shouldProcessEvent(event)) {


            // temp kludge - see TODO in ObjectStore.snapshotsChanged(..)
            GraphDiff diff = event.getDiff();
            if (diff instanceof SnapshotEventDecorator) {
                SnapshotEvent decoratedEvent = ((SnapshotEventDecorator) diff).getEvent();
                context.getObjectStore().processSnapshotEvent(decoratedEvent);
            }
            else {
                synchronized (context.getObjectStore()) {
                    diff.apply(this);
                }
            }


            // repost channel change event for our own children
            context.fireDataChannelChanged(event.getPostedBy(), event.getDiff());

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        processIndirectlyModifiedIDs(event.getIndirectlyModifiedIds());


        // TODO: andrus, 3/28/2006 - 'SnapshotEventDecorator' serves as a bridge (or
        // rather a noop wrapper) between old snapshot events and new GraphEvents. Once
        // SnapshotEvents are replaced with GraphEvents (in 2.0) we won't need it
        GraphDiff diff = new SnapshotEventDecorator(event);


        ObjectContext originatingContext = (event.getPostedBy() instanceof ObjectContext)
                ? (ObjectContext) event.getPostedBy()
                : null;
        context.fireDataChannelChanged(originatingContext, diff);

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                        changes,
                        syncType);


        callbackAction.applyPreCommit();


        GraphDiff result;
        switch (syncType) {
            case DataChannel.ROLLBACK_CASCADE_SYNC:
                result = onSyncRollback(originatingContext);
                break;
            // "cascade" and "no_cascade" are the same from the DataDomain

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Related Classes of org.apache.cayenne.graph.GraphDiff

org.apache.cayenne.access.ClientServerChannel

org.apache.cayenne.access.DataContext

org.apache.cayenne.access.DataContextCommitTest

org.apache.cayenne.access.DataContextMergeHandler

org.apache.cayenne.access.DataDomain

org.apache.cayenne.access.DataDomainFiltersTest

org.apache.cayenne.access.ObjectStore

org.apache.cayenne.CayenneContext

org.apache.cayenne.CayenneContextGraphManager

org.apache.cayenne.intercept.DataChannelCallbackInterceptor

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