Creating a database as a callback?

[Kevin Burton]

I notice in the examples that I have seen the database handle is always created as something like:

var db = new neo4j.GraphDatabase();

This seems to be "non-node" like. Is there a form of this where the database and an error object is passed to a callback. Something like:

neo4j.CreateGraphDatabase(function(err, db) {


. . . . .


});

Thank you. 

[Aseem Kishore]

Hi Kevin,

Creating the database handle doesn't require any network call or anything like that, which is why it returns immediately rather than via a callback.

This is similar to many other libraries for things beyond Neo4j. E.g. creating a handle to an S3 bucket with the AWS SDK, or an S3 client with Knox:

http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/node-examples.html

https://github.com/Automattic/knox

Any particular reason you need it to be returned via a callback?

Aseem

[Kevin Burton]

No particular reason. It just seemed more consistent to use a callback. Also one less variable in global space.

Thank you.

Kevin

[Aseem Kishore]

If you'd like, you can easily wrap it to use a callback:

function createGraphDatabase(opts, callback) {

    setImmediate(function () {

        try {

            var db = new neo4j.GraphDatabase(opts);

            callback(null, db);

        } catch (err) {

            callback(err, null);

        }

    });

}

Cheers,

Aseem