Connection to MongoDB using Morphia

[Vaishnavi Manjunath]

I am developing a Java Restful web application and planning to use MongoDB with Morphia as ODM . As I am new to MongoDB, I needed a few suggestions.

1. The best way to handle db connections is to make use of db connection pool, which mongoClient takes care of. 

        Morphia morphia = new Morphia();   

        ServerAddress addr = new ServerAddress("127.0.0.1", 27017);  

        String databaseName = "test";  

        MongoClient mongoClient = new MongoClient(addr);  

        Datastore datastore = morphia.createDatastore(mongoClient, databaseName); 

 So I need to reuse the above datastore and not create a new instance upon every request as it can waste a lot of resources and affect performance. Should I be implementing the above as singleton class? Can someone help me through this?

2. Also can someone explain as to how I can set up configuration for db connections such as max connections per host, connection timeout in Morphia using MongoClientOptions?

[Enrico Morelli]

On Monday, March 13, 2017 at 3:04:45 PM UTC+1, Vaishnavi Manjunath wrote:

I am developing a Java Restful web application and planning to use MongoDB with Morphia as ODM . As I am new to MongoDB, I needed a few suggestions.

1. The best way to handle db connections is to make use of db connection pool, which mongoClient takes care of. 

        Morphia morphia = new Morphia();   

        ServerAddress addr = new ServerAddress("127.0.0.1", 27017);  

        String databaseName = "test";  

        MongoClient mongoClient = new MongoClient(addr);  

        Datastore datastore = morphia.createDatastore(mongoClient, databaseName); 

 So I need to reuse the above datastore and not create a new instance upon every request as it can waste a lot of resources and affect performance. Should I be implementing the above as singleton class? Can someone help me through this?

Yes, you can implement as Singleton class. I created a morphia plugin for Play Framework. If you want you can look at https://github.com/morellik/play-morphia.

 

2. Also can someone explain as to how I can set up configuration for db connections such as max connections per host, connection timeout in Morphia using MongoClientOptions?

You can do something like that:

MongoClientOptions options = MongoClientOptions.builder() 
              .connectionsPerHost(100)
              .maxConnectionIdleTime(60000)
              .build() 

an pass options to MongoClient.