AOP Module

var aop = function(schema) {

    schema.aop = [];

    var executePre = function(functions, index, context, next) {
        if (functions.length == index) {
            next();
        } else {
            functions[index](context, function() {
                executePre(functions, index + 1, context, next);
            });
        }
    };

    var executePost = function(functions, index, context, doc) {
        if (functions.length !== index) {
            functions[index](context, function() {
                executePost(functions, index + 1, context, doc);
            });
        }
    };

    var execute = function(method, pre, post){
      if(pre){
        schema.pre(method, function(next) {
          executePre(pre, 0, this, next);
        });
      }
      if(post){
        schema.post(method, function(doc) {
          executePost(post, 0, this, doc);
        });
      }
    };

    schema.runAOP = function() {
        for (var i = 0; i < schema.aop.length; i++) {
            var aop = {
                method: schema.aop[i].method || 'save',
                pre: schema.aop[i].pre || false,
                post: schema.aop[i].post || false
            };
            execute(aop.method, aop.pre, aop.post);
        }
    };

};

module.exports = aop;