We should have a RequestContextCache component.

[bgaillard]

When a Request Manager starts it overwrites 3 methods of XMLHttpRequest 👍

• XMLHttpRequest#open(method, url, async, username, password)
• XMLHttpRequest#send(data)
• XMLHttpRequest#setRequestHeader(name, value)

The first time the XMLHttpRequest#open(method, url, async, username, password) is called it creates a RequestContext object which is stored inside a cache.

XMLHttpRequest.prototype.open = function() {

    // Creates a RequestContext object for the request
    var requestContext = OAuth.RequestContext.create(this, arguments);

    // Stores the RequestContext object in the RequestContext cache      
    This.addRequestContext(requestContext);

    // Calls the OAuth.JS overwritten 'open' method
    return This._open(requestContext);

};

The in the overwritten send and setRequestHeader methods we get the RequestObject back.

XMLHttpRequest.prototype.setRequestHeader = function(key, value) {

    // Gets the RequestContext associated to this original XMLHttpRequest object from the RequestContext cache 
    var requestContext = This.getRequestContext(this.getId());

    ...

};

For now the cache is managed directly in the AbstractRequestManager, to have something easy to test and update we should create a new dedicated RequestContextCache component.

Be careful in the implementation, the RequestContext objects associated to already used xhrs should be evicted to free memory.