Tutorial by Topics: dispatch

Grand Central Dispatch (GCD) is Apple's answer to multithreading. It is a lightweight framework for performing tasks synchronously or asynchronously in queues and handles CPU threads for you behind the scenes.

Related Topic: Concurrency

Grand Central Dispatch (GCD) In iOS, Apple provides two ways to do multitasking: The Grand Central Dispatch (GCD) and NSOperationQueue frameworks.We will discuss here about GCD. GCD is a lightweight way to represent units of work that are going to be executed concurrently You don’t schedule these units of work; the system takes care of scheduling for you. Adding dependency among blocks can be a headache. Canceling or suspending a block creates extra work for you as a developer!

What is Dynamic Method Dispatch?

Dynamic Method Dispatch is a process in which the call to an overridden method is resolved at runtime rather than at compile-time. When an overridden method is called by a reference, Java determines which version of that method to execute based on the type of object it refer to. This is also know as runtime polymorphism.

We will see this through an example.

In Spring Web MVC, DispatcherServlet class works as the front controller. It is responsible for managing the flow of the spring MVC application.

DispatcherServlet is also like normal servlet need to be configured in web.xml

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