Можете да създадете singleton
Datastore
обект
public enum MongoDBHelper { // the best way to implement singletons, due to the author of Effective Java
INSTANCE;
private DB db;
private Datastore datastore;
private final String SERVER_URL = "...";
private final int SERVER_PORT = ...;
private final String USERNAME= "...";
private final String PASSWORD = "...";
private final String DATABASE_NAME = "...";
private MongoDBHelper() {
try {
MongoClient mongoClient = new MongoClient(SERVER_URL, SERVER_PORT);
this.db = mongoClient.getDB(DATABASE_NAME);
this.db.authenticate(USERNAME,PASSWORD.toCharArray());
Morphia morphia = new Morphia();
this.datastore = morphia.createDatastore(mongoClient, DATABASE_NAME);
morphia.mapPackage("package");
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
public DB getDB() {
return this.db;
}
public Datastore getDatastore() {
return this.datastore;
}
}
и сега можете да използвате повторно същото Datastore
обект във вашето приложение
Datastore datastore = MongoDBHelper.INSTANCE.getDatastore()