I have some files that need database access so I have a file like this:
...
var dynamo = new AWS.DynamoDB.DocumentClient();
module.exports.getDatabase= function(){
return dynamo;
};
...
I wonder if different .js files use it like this:
var DataUtil = require('./shared/dataUtils.js');
...
var database = DataUtil.getDatabase();
....
are they using the same instance of the object? or just instantiating a copy for each of the .js file using the requiring?
Yes, it's the same instance. When you require a module, it's only loaded when it's not already loaded. So there's only one instance of a module in a node program.
From the documentation:
Modules are cached after the first time they are loaded. This means (among other things) that every call to require('foo') will get exactly the same object returned, if it would resolve to the same file.
In your case, you'll have only one instance of AWS.DynamoDB.DocumentClient.
