function paginationService() {

        var instances = {};
        var lastRegisteredInstance;

        this.registerInstance = function(instanceId) {
            if (typeof instances[instanceId] === 'undefined') {
                instances[instanceId] = {
                    asyncMode: false
                };
                lastRegisteredInstance = instanceId;
            }
        };

        this.deregisterInstance = function(instanceId) {
            delete instances[instanceId];
        };
        
        this.isRegistered = function(instanceId) {
            return (typeof instances[instanceId] !== 'undefined');
        };

        this.getLastInstanceId = function() {
            return lastRegisteredInstance;
        };

        this.setCurrentPageParser = function(instanceId, val, scope) {
            instances[instanceId].currentPageParser = val;
            instances[instanceId].context = scope;
        };
        this.setCurrentPage = function(instanceId, val) {
            instances[instanceId].currentPageParser.assign(instances[instanceId].context, val);
        };
        this.getCurrentPage = function(instanceId) {
            var parser = instances[instanceId].currentPageParser;
            return parser ? parser(instances[instanceId].context) : 1;
        };

        this.setItemsPerPage = function(instanceId, val) {
            instances[instanceId].itemsPerPage = val;
        };
        this.getItemsPerPage = function(instanceId) {
            return instances[instanceId].itemsPerPage;
        };

        this.setCollectionLength = function(instanceId, val) {
            instances[instanceId].collectionLength = val;
        };
        this.getCollectionLength = function(instanceId) {
            return instances[instanceId].collectionLength;
        };

        this.setAsyncModeTrue = function(instanceId) {
            instances[instanceId].asyncMode = true;
        };

        this.setAsyncModeFalse = function(instanceId) {
            instances[instanceId].asyncMode = false;
        };

        this.isAsyncMode = function(instanceId) {
            return instances[instanceId].asyncMode;
        };
    }
This service allows the various parts of the module to communicate and stay in sync.