Examples with DefaultRowModelRequest org.neo4j.ogm.cypher.query.DefaultRowModelRequest used on opensource projects

Example 11 with DefaultRowModelRequest

use of org.neo4j.ogm.cypher.query.DefaultRowModelRequest in project neo4j-ogm by neo4j.

the class DeleteDelegate method deleteOneOrMoreObjects.

// TODO : this is being done in multiple requests at the moment, one per object. Why not put them in a single request?
private void deleteOneOrMoreObjects(List<?> objects, Set<Object> neighbours) {
    Set<Object> notified = new HashSet<>();
    if (session.eventsEnabled()) {
        for (Object affectedObject : neighbours) {
            if (!notified.contains(affectedObject)) {
                session.notifyListeners(new PersistenceEvent(affectedObject, Event.TYPE.PRE_SAVE));
                notified.add(affectedObject);
            }
        }
    }
    for (Object object : objects) {
        MetaData metaData = session.metaData();
        ClassInfo classInfo = metaData.classInfo(object);
        if (classInfo == null) {
            session.warn(object.getClass().getName() + " is not an instance of a persistable class");
        } else {
            MappingContext mappingContext = session.context();
            Long id = mappingContext.optionalNativeId(object).filter(possibleId -> possibleId >= 0).orElseGet(() -> {
                session.warn(String.format("Instance of class %s has to be reloaded to be deleted. This can happen if the session has " + "been cleared between loading and deleting or using an object from a different transaction.", object.getClass()));
                return classInfo.getPrimaryIndexOrIdReader().apply(object).map(primaryIndexOrId -> session.load(object.getClass(), (Serializable) primaryIndexOrId)).flatMap(reloadedObject -> mappingContext.optionalNativeId(reloadedObject)).orElse(-1L);
            });
            if (id >= 0) {
                Statement request = getDeleteStatement(object, id, classInfo);
                if (session.eventsEnabled() && !notified.contains(object)) {
                    session.notifyListeners(new PersistenceEvent(object, Event.TYPE.PRE_DELETE));
                    notified.add(object);
                }
                RowModelRequest query = new DefaultRowModelRequest(request.getStatement(), request.getParameters());
                session.doInTransaction(() -> {
                    try (Response<RowModel> response = session.requestHandler().execute(query)) {
                        if (request.optimisticLockingConfig().isPresent()) {
                            List<RowModel> rowModels = response.toList();
                            session.optimisticLockingChecker().checkResultsCount(rowModels, request);
                        }
                        if (metaData.isRelationshipEntity(classInfo.name())) {
                            session.detachRelationshipEntity(id);
                        } else {
                            session.detachNodeEntity(id);
                        }
                        // enabled in the first place.
                        if (notified.contains(object)) {
                            session.notifyListeners(new PersistenceEvent(object, Event.TYPE.POST_DELETE));
                        }
                    }
                }, Transaction.Type.READ_WRITE);
            }
        }
    }
    if (session.eventsEnabled()) {
        for (Object affectedObject : neighbours) {
            if (notified.contains(affectedObject)) {
                session.notifyListeners(new PersistenceEvent(affectedObject, Event.TYPE.POST_SAVE));
            }
        }
    }
}