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Anindya Chatterjee
@anidotnet
sure.
Guido Steinacker
@guidosteinacker1969
Hi, is there any possibility to use off-heap memory with Nitrite? The H2 MVStore is able to do so (http://www.h2database.com/html/mvstore.html#offHeap), so I would expect this a nice feature for Nitrite too.
Anindya Chatterjee
@anidotnet
Currently no. But I can introduce it in the next release. Please raise a github issue to track this request.
Guido Steinacker
@guidosteinacker1969
Perfect - thank you!
Lahiru Chandima
@hmlcsoft_gitlab
When reading the documentation, it is apparent than the db needs to be closed before exiting the application to ensure data integrity.
In my android app, I open a database on app startup and keep the db open. I need to do db writes throughout the application lifetime.
It is not clear when to close the database in my app.
Is there a specific event in android app which is suitable to close the nitrite database? Or, would I need to commit the changes after each write?
Anindya Chatterjee
@anidotnet
There are several options for this.
  1. If you are opening database in your main activity, then close the db when the activity gets stopped. Call the db.close() inside onStop()
  2. Make sure jvm shutdown hook is not disabled.
  3. If you are opening the db not tied with activity, subscribe to application lifecycle events by implementing LifecycleObserver of AAC and handle the db appropriately.
A sample code for LifecycleObserver is given above here in previous chats.
Tareq Kirresh
@TareqK
Ello
Im having issues querying embedded documents
ive cloned and am working on the PR
do i also add the unit tests?
#162 is the issue
Anindya Chatterjee
@anidotnet
@TareqK before you work on it, please provide a reproducible code and let me validate it. It might be an expected behavior.
Sam Illingworth
@mazz0_gitlab
Hi guys, I wonder if someone can help me. When I try to annotate my object for use with Nitrate I get the error "IndexType cannot be resolved to a variable". Do I need an additional import perhaps? My code:
    @Indices({
         @Index(value = "msgId", type = IndexType.Unique)
    })
Sam Illingworth
@mazz0_gitlab

Also using the example on the main GitHub page:

    Employee emp = repository.find(eq("firstName", "John"))
                         .firstOrDefault();

I get the error that the method eq(string, string) doesn't exist. Something else I need to import?

Anindya Chatterjee
@anidotnet
Ofcourse you need imports. Please consult the javadoc for appropriate package names or use any good ide which will assist you in importing. eq is a static import. It's a static method in ObjectFilters class.
Tareq Kirresh
@TareqK
@anidotnet Ive uploaded a code example with tests covering all the cases that ive had trouble with, its here
Abbas Anwer Ali
@abbasshah17
Hi, does Nitrite support encrypted db?
Anindya Chatterjee
@anidotnet
@abbasshah17 no it does not currently.
FORUM Gesellschaft für Informationssicherheit mbH
@forum-is
Hi there! First of all, thanks to @anidotnet for creating NitriteDB – so far, it works very well in our project.
FORUM Gesellschaft für Informationssicherheit mbH
@forum-is
I have a question concerning the performance of InFilter when matching a larger number of values. Wouldn't it be better to use a HashSetinstead of an ArrayList for objectList internally?
Anindya Chatterjee
@anidotnet
@forum-is thanks for using nitrite. Regarding your concern, it does not make any difference. Everywhere it is being used as objectList.contains(value). So HashSet or ArrayList are same here.
FORUM Gesellschaft für Informationssicherheit mbH
@forum-is
But there is a huge difference in regards to performance for larger arrays, as containsfor an ArrayListneeds to check sequentially -> O(n) whereas we are close to O(1) for a HashSet, see https://www.baeldung.com/java-hashset-arraylist-contains-performance .
FORUM Gesellschaft für Informationssicherheit mbH
@forum-is
Also, I'd like to suggest a NotInFilterwhich would be beneficial compared to NotFilter(InFilter(...))as we could exit early on first mismatch instead of having to check all values an then negating the result.
Anindya Chatterjee
@anidotnet
@forum-is yes your are right. HashMap implementation of HashSet slipped my mind :). and idea of NotInFilter also is good. Could you please raise a github issue to track this?
FORUM Gesellschaft für Informationssicherheit mbH
@forum-is
Thanks, will do.
I am also experimenting with Lucene as FullText-Index based on your nice example in the docs.
Anindya Chatterjee
@anidotnet
great.. let me know how it goes..
FORUM Gesellschaft für Informationssicherheit mbH
@forum-is
Instead of a RAMDirectory I am using FSDirectory to persist the index. However, the constant commit(); on each update in your example is completely destroying the performance.
Without commit();Lucene will flush by itself when reaching a certain RAM buffer limit and/or document count. This seems to improve performance vastly, yet I am unable to obtain current search results. :-( Also, the TextIndexService would require a close()method to properly commit any remaining changes.
Anindya Chatterjee
@anidotnet
I have to admit that lucene example is a rudimentary one of how to glue external indexing service. It is not at all a well thought out performant component. Moreover, close() method in an indexing service is counter intuitive. When it is going to be called or at what interval? Who will call it? Ideally indexing service should not be accessible from application/user. As indexing is an ongoing operation, so here I would suggest registering a listener, which will listen to any changes made to the indexed data, and call commit() appropriately.
FORUM Gesellschaft für Informationssicherheit mbH
@forum-is
I was not thinking about calling close()externally, but rather from within db.close()(if an indexing service is reqistered).
newk5
@newk5
Hello, I recently discovered nitrite and would very much like to use it, but the limitation of having only 1 process being able to connect to it, makes it very very difficult to use in my application
my scenario is as follows:
I have a jsf webapp that's being served by a web container (glassfish) and I would like to use nitrite
during development stages of this webapp, any changes I make to the code, the webapp has to be re-deployed to the web container (glassfish) and I connect to nitrite when the application is initializing
newk5
@newk5
the process that opened the connection to nitrite is the web container (glassfish), so every time I have to re-deploy my webapp to apply any changes, the webapp tries to connect to nitrite when initializing, but fails because it detected that another process (glassfish) has already opened the connection to nitrite
so it forces me to shutdown the whole server (glassfish) to release the lock, and then I have start everything back up again
and I have to do this every single time I make any small change to my webapp which makes development cycles very slow
is there anything I can do to prevent this from happening?
I wouldn't mind this limitation after the webapp is in production, but during the development stages I really need to be able to apply changes to my webapp without having to restart the whole server
Anindya Chatterjee
@anidotnet
As nitrite is an embedded database, so placing a lock is logical to keep the database consistent and prevent corruption. In your use case one thing you can do is to create a lite db server around nitrite. Expose your basic functionalities as a rest web service from a separated app and embed nitrite to that application. Now all your glashfish containers need to talk to the rest api application to accomplish your task. In that way you can maintain only one instance of nitrite for a cluster of your glashfish servers.
newk5
@newk5
yea I understand the need for a lock but there's some embedded databases (like SQLite for example) that allow multiple processes to acess the DB and I was hoping nitrite could work similarly
newk5
@newk5
I thought about creating a webservice layer but then I'd have to work on exposing all the needed functionalities, it would be twice the work and I would be solving a "temporary" issue which only happens during the development stages and will never happen when the app is in production
I'm going to re-evaluate my app and see if I can find an alternative solution to this issue
thank you for your help regardless
Georg Leber
@GeorgHenkel
Hi, I have some problems with finding my Objects in the Nitrite DB. I have a created a minimal test case showing my problem: https://github.com/GeorgHenkel/nitrite-repository-test What am I doing wrong?
Georg Leber
@GeorgHenkel
I've found out that, when the field "normDesignation" is used in the FullText-Index, the find call does not return any result. Another problem I've figured out with another usecase is, that the id field cannot be of type UUID. The find call does not find any entry, if searched by id.
Anindya Chatterjee
@anidotnet
Try using ObjectFilters.text("normDesignation", "M1") instead of ObjectFilters.eq("normDesignation", "M1"). When a field is full-text indexed, text filter need to be used.