CompletionStage

CompletionStage is a construct introduced in Java 8, in the java.util.concurrent package, that represents that a task is completed or will complete in the future and can be used to chain asynchronous computations. It's a way to handle asynchronous tasks and operations in a more structured and efficient manner, providing better control and visibility into the completion status of these tasks and their results.

Introduction to CompletionStage

Asynchronous programming involves handling tasks or operations that may take a significant amount of time to complete, but we don't want to block the main thread while waiting for these tasks to finish. CompletionStage provides a framework to handle such tasks, allowing us to define a sequence of tasks that depend on each other and execute them asynchronously without blocking the main thread. It offers a flexible and composable approach to managing asynchronous operations, enabling us to chain and combine tasks, handle their results, and respond to their completion or failure.

CompletionStage is a versatile construct that can be used in various scenarios, including:

• Performing long-running tasks without blocking the main thread.
• Chaining multiple asynchronous tasks to create complex workflows.
• Handling the results of asynchronous tasks, whether successful or failed.
• Combining multiple asynchronous tasks to create more complex operations.