Asynchronous Call in Java
In this article, we are going to study the Asynchronous call in the JAVA programming language. At the end of the article, we will get a clear picture of the Asynchronous call and how it differs from synchronous call in the JAVA programming language. Firstly, let us know what is a "CallBack" in the programming sense.
What is a CallBack in JAVA?
The CallBack keyword is used to define a function in JAVA programming along with many other programming languages. A CallBack function is an argument that is passed down into some other function. The CallBack function will be executed after the firing of a particular event in the given program. The true motive of a CallBack function is to inform a particular class about the status of a work in another class.
The CallBack function is useful when we are working on some Asynchronous tasks. The callback is also useful while making use of " Event Handling ", as it is used to provide some sort of notification when a button is clicked by the user on the interface. So, we can understand that a CallBack function plays an essential role while performing routine tasks in a program, such as performing various operations and fetching some data from the web. As for the implementation of a CallBack function in the JAVA programming language, it can be implemented using an interface. Let us see the standard procedure for the implementation of the CallBack function in JAVA programming.
A procedure that is followed for implementing the Callback function:
Types of CallBack in Java
What is a Synchronous call?
A call which will restrict a program from the execution of its code, and once the event returns a response or is complete, the call returns back from the event to the CallBack function is known as a Synchronous call. All the operations are performed by the callback before returning to the statement.
The Synchronous calls wait for the execution, so the time taken for the completion of the program is more than the actual time. We can find a significant time lag within these types of programs. The tasks in the Synchronous calls are executed sequentially. So, the user can use the Synchronous call when the problem must be completed in sequential order and when the problem does not require much time. The execution of the code is paused, and the code waits for the event before being resumed. In this way, the process of Synchronous calls takes place. Now let us understand a Synchronous call with the help of a program in JAVA.
The task that is being performed here is synchronous task Performing callback after the completion of Synchronous task
By getting to know the above program, we can understand the role of a Synchronous call using the CallBack method in the JAVA programming language. We can observe that every step that is discussed is involved within the above program. As mentioned above, we used the Event listener interface in the program.
When do we use Synchronous call?
We use Synchronous call in situations in which there are several tasks that are supposed to be performed in a particular order, one after the other involved within the program. The tasks that consume less time are also considered to be called under the Synchronous type.
What is an Asynchronous call?
A call which will not restrict a program from the execution of its code, and once the event is complete, the call returns back from the event to the CallBack function is known as an Asynchronous call. To avoid this, a new thread must be created, and the CallBack method should be invoked inside the thread in the JAVA programming context. It is not mandatory to invoke the CallBack method inside a thread. A CallBack may also create a new thread when invoked, thus making the call asynchronous.
The tasks in Asynchronous call are executed parallelly or simultaneously, i.e., if one task is executed at a particular time, the other task can also work within the same time without waiting for the completion of the previous task. So, the user or the programmer can use an Asynchronous call when the problem is very big, and the tasks must be completed parallelly in such a way that the tasks are not dependent on each other. The execution of the code is not asked to wait during this call. In this way, the process of Asynchronous call takes place. Now let us understand an Asynchronous call with the help of a program in JAVA.
This is Example and Tutorial here Performing callback after the completion of an Async Task
By getting to know the above program, we can understand the role of an Asynchronous call using the CallBack method in the JAVA programming language. We can observe that a new thread is created, and the CallBack is invoked inside this thread itself. As mentioned above, we made use of the Event listener interface in the program.
When do we use Asynchronous call?
We use Asynchronous call in situations in which the tasks that are involved within the program are not depending on each other so that the pause of execution in one task will not affect the other. The tasks that consume more time are also considered to be called under the Asynchronous type.
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