In this video we will learn about Non-Blocking Asynchronous Microservices in Springboot framework using Async annotation with Java coding example.
A non-blocking API for the resources allows calling the resources without waiting for the blocked call such as database access and network calls. If the resources are not available at the time of calling, then it moves to other work rather than waiting for the blocked resources. The system is notified when the blocked resources are available.
** Difference between Blocking & Non-Blocking Microservices **
The synchronous (blocking APIs) block the execution of the thread where they are called until a result is received from the server. The asynchronous (non-blocking) APIs do block, the program can continue its execution. The asynchronous (non-blocking) APIs uses methods with a call-back argument.
** What is Multithreading? **
Multithreading refers to a process of executing two or more threads simultaneously for maximum utilization of the CPU. A thread in Java is a lightweight process requiring fewer resources to create and share the process resources. Multithreading is the ability of a program or an operating system to enable more than one user at a time without requiring multiple copies of the program running on the computer. Multithreading can also handle multiple requests from the same user. Multithreading allows the execution of multiple parts of a program at the same time. These parts are known as threads and are lightweight processes available within the process. So multithreading leads to maximum utilization of the CPU by multitasking.
** What is multithreading in Java? **
In Java, Multithreaded applications execute two or more threads run concurrently. Hence, it is also known as Concurrency in Java. Each thread runs parallel to each other.
** What are worker threads in java? **
Worker thread in Java is a high-priority thread that runs in the foreground. Worker thread is a continuous parallel thread that runs and accepts messages until the time it is explicitly closed or terminated. Messages to a worker thread can be sent from the parent thread or its child worker threads.
** What are the benefits of multithreading? **
1. multithreading Improved throughput.
2. Simultaneous and fully symmetric use of multiple processors for computation and I/O.
3. Superior application responsiveness.
4. multithreading Improved server responsiveness.
5. Program structure simplification.
6. Better communication.
** Multithreading in Springboot **
Multithreading in spring boot is achieved using Async annotation and using Task Executor Service class. Multithreading in spring boot is similar to multitasking, except that it allows numerous threads to run concurrently rather than processes. A thread in Java is a sequence of programmed instructions that are managed by the operating system's scheduler. Threads can be utilized in the background to conduct complex activities without interfering with the main program. It is worth mentioning that a thread shares common memory with other threads across the application, but a process is separate and does not share memory.
** Usage and Advantage of Non-Blocking Microservices **
1. Non-blocking asynchronous microservices can handle very high number requests at the same time.
2. This approach can be used for sudden surge in the incoming request.
** Chapter Timestamps **
0:00 Introduction to Non-Blocking Asynchronous Microservices
1:21 Agenda of this video
3:14 Understanding Parallel Processing
7:02 Understanding Asynchronous processing
9:58 Understanding blocking microservices and challenges
14:58 Explaining Non-Blocking Asynchronous Microservices Solution
17:42 Difference between Blocking and Non-blocking Microservices
19:54 Spring boot Async Annotation explained
20:50 Java code implementation of Non-Blocking Asynchronous Microservices
27:08 Performance Testing of Blocking & Non-Blocking Asynchronous Microservices.
31:10 Usage of Non-Blocking Asynchronous Microservices
32:23 Advantages of Non-Blocking Asynchronous API
33:58 Summary of Non-Blocking Asynchronous API
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