public <T> Key<T> merge(T entity, WriteConcern wc) {
LinkedHashMap<Object, DBObject> involvedObjects = new LinkedHashMap<Object, DBObject>();
DBObject dbObj = mapr.toDBObject(entity, involvedObjects);
Key<T> key = getKey(entity);
entity = ProxyHelper.unwrap(entity);
Object id = getId(entity);
if (id == null)
throw new MappingException("Could not get id for " + entity.getClass().getName());
Query<T> query = (Query<T>) createQuery(entity.getClass()).filter(Mapper.ID_KEY, id);
// remove (immutable) _id field for update.
dbObj.removeField(Mapper.ID_KEY);
UpdateResults<T> res = update(query, new BasicDBObject("$set", dbObj), false, false, wc);
// check for updated count if we have a gle
CommandResult gle = res.getWriteResult().getCachedLastError();
if (gle != null && res.getUpdatedCount() == 0) throw new UpdateException("Not updated: " + gle);
postSaveOperations(entity, dbObj, involvedObjects);
return key;
}
protected <T> WriteResult tryVersionedUpdate(
DBCollection dbColl, T entity, DBObject dbObj, WriteConcern wc, DB db, MappedClass mc) {
WriteResult wr = null;
if (mc.getFieldsAnnotatedWith(Version.class).isEmpty()) return wr;
MappedField mfVersion = mc.getFieldsAnnotatedWith(Version.class).get(0);
String versionKeyName = mfVersion.getNameToStore();
Long oldVersion = (Long) mfVersion.getFieldValue(entity);
long newVersion = VersionHelper.nextValue(oldVersion);
dbObj.put(versionKeyName, newVersion);
if (oldVersion != null && oldVersion > 0) {
Object idValue = dbObj.get(Mapper.ID_KEY);
UpdateResults<T> res =
update(
find((Class<T>) entity.getClass(), Mapper.ID_KEY, idValue)
.filter(versionKeyName, oldVersion),
dbObj,
false,
false,
wc);
wr = res.getWriteResult();
if (res.getUpdatedCount() != 1)
throw new ConcurrentModificationException(
"Entity of class "
+ entity.getClass().getName()
+ " (id='"
+ idValue
+ "',version='"
+ oldVersion
+ "') was concurrently updated.");
} else if (wc == null) wr = dbColl.save(dbObj);
else wr = dbColl.save(dbObj, wc);
// update the version.
mfVersion.setFieldValue(entity, newVersion);
return wr;
}