Today we’ll talk about the ways to filter user access to some controllers and actions in the Grails application. There are few solutions that could be really useful for implementing this task. So let’s look at a quick overview of them.
Concurrent programs is not a novelty today, almost every modern application executes in multiple threads. But as concurrency brought us better resource utilization and throughput, it also introduced a number of issues nonexistent in serial execution. One of them is deadlocks. A deadlock is a situation where in two or more competing actions are each waiting for the other to finish, and thus neither ever does.
Modern web applications are counting on the big amount of users, so efficiency is a very important aspect of a web development. Today we’ll talk about the ways to increase efficiency of the web application, developed on the Grails platform.
An immutable object is one whose state cannot be changed after construction. All the beauty in these objects is that they are simple and safe. In multi-threaded applications all concurrency issues boil down to coordinating access to mutable state. The less mutable state, the easier it is to ensure thread safety. That’s why you should always consider making your objects immutable whenever it is feasible. Creating an immutable type is not a complex process, but you should follow a handful of rules to stay away from pitfalls it definitely implies.
Java locks often supersede synchronized blocks and methods by allowing to back out from the synchronization attempt. This post shows how to use the feature, and demonstrates some other basic concepts, like the lock fairness and reentrant locks, which should help you to get started with the lock-based synchronization.
Using command objects in Grails is a simple way to perform data binding and validation when there is no need to create domain object. In this tutorial I will show you some examples of using it.
This week I would like to talk about aspect oriented programming. A lot of programming paradigms like OOP, modular programming and other, let to divide functionality into logical parts (functions modules, classes). But these functional elements may be marked out into separate modules. Aspect oriented programming (AOP) has as a target to provide separation of functionality and addition to points where it really needs.
In the world of mathematics real numbers have infinite precision and are therefore continuous and nonlossy. Floating-point numbers, which are used in computing, are limited with a finite precision and are not evenly spaced throughout their range. If don't keep this in mind you can get into many numerical blunders.
In the previous post I’ve told how to bill a customer with a minimal fuss. But oftentimes returning customers wish to add or change their billing information or maybe you want to delete the old ones. Let’s dive deeper and see what’s possible to do with Authorize.Net Customer Information Manager by remote procedure calls using, as previously, Java SDK.