Nitrite Database

NOsql Object (NO2 a.k.a Nitrite) database is an open source nosql embedded document store written in Java with MongoDB like API. It supports both in-memory and single file based persistent store.

                                    
<dependency>
    <groupId>org.dizitart</groupId>
    <artifactId>nitrite</artifactId>
    <version>{version}</version>
</dependency>
                                    
                                

                                    
Nitrite db = Nitrite.builder()
    .compressed()
    .filePath("/tmp/test.db")
    .openOrCreate("user", "password");

// Create a Nitrite Collection
NitriteCollection collection = db.getCollection("test");

// create a document to populate data
Document doc = createDocument("firstName", "John")
     .put("lastName", "Doe")
     .put("birthDay", new Date())
     .put("data", new byte[] {1, 2, 3})
     .put("fruits", new ArrayList<String>() {{ add("apple"); add("orange"); }})
     .put("note", "a quick brown fox jump over the lazy dog");

// insert the document
collection.insert(doc);

// update the document
collection.update(eq("firstName", "John"), createDocument("lastName", "Wick"));
                                    
                                

Nitrite is a server-less embedded database ideal for desktop, mobile or small web applications. It is powered by MVStore engine of h2 database.

It features:

• Embedded key-value/document and object store
• In-memory or single data file
• Very fast and lightweight MongoDB like API
• Indexing
• Full text search capability
• Full Android compatibility
• Observable store
• Both way replication via Nitrite DataGate server

Create Indices

                                    
// create document index
collection.createIndex("firstName", indexOptions(IndexType.NonUnique));
collection.createIndex("note", indexOptions(IndexType.Fulltext));
                                    
                            

Query a Collection

                                    
Cursor cursor = collection.find(
    // and clause
    and(
        // firstName == John
        eq("firstName", "John"),
        // elements of data array is less than 4
        elemMatch("data", lt("$", 4)),
        // elements of fruits list has one element matching orange
        elemMatch("fruits", regex("$", "orange")),
        // note field contains string 'quick' using full-text index
        text("note", "quick")
        )
    );

for (Document document : cursor) {
    // process the document
}
                                    
                            

Synchronization

Nitrite database supports cross device synchronization via Nitrite DataGate server.

                                    
// connect to a DataGate server running at localhost 9090 port
DataGateClient dataGateClient = new DataGateClient("http://localhost:9090")
        .withAuth("userId", "password");
DataGateSyncTemplate syncTemplate
        = new DataGateSyncTemplate(dataGateClient, "remote-collection@userId");

// create sync handle
SyncHandle syncHandle = Replicator.of(db)
        .forLocal(collection)
        // a DataGate sync template implementation
        .withSyncTemplate(syncTemplate)
        // replication attempt delay of 1 sec
        .delay(timeSpan(1, TimeUnit.SECONDS))
        // both-way replication
        .ofType(ReplicationType.BOTH_WAY)
        // sync event listener
        .withListener(new SyncEventListener() {
            @Override
            public void onSyncEvent(SyncEventData eventInfo) {

            }
        })
        .configure();

// start sync in the background using handle
syncHandle.startSync();