Service.prototype.queryNamespaces = function(params)
{
    var self = this;
    var namespacesDir = path.join('.cologic', 'namespaces');

    return q.nfcall(fs.readdir, namespacesDir).then(function(filenames) {

        var deferred = q.defer();

        var fileStatPromises = filenames.map(function(filename) {
            return q.nfcall(fs.stat, path.join(namespacesDir, filename, 'namespace.json')).then(function(stats) {
                if (stats.isFile()) {
                    return filename;
                } else {
                    return null;
                }
            }, function() {
                return null;
            });
        });

        q.all(fileStatPromises).then(function(validNames) {
            var metaPromises = validNames.filter(function(name) {
                return name !== null;
            }).map(function(name) {

                return self.getNamespaceMeta({id: name});
            });
            return q.all(metaPromises);
        }).then(function(metas) {
            deferred.resolve(metas);
        }).catch(function(error) {
            deferred.reject(error);
        }).done();

        return deferred.promise;
    });
};