Dr Heinz M. Kabutz – Transmogrifier – Java NIO and Non-Blocking IO

Java.NIO has been with us since Java 1.4. Yep, that’s over 15 years ago! And you still don’t know how it works?

In this mini-course, we start by learning how the “old” Java.IO works by writing three different servers.

We then move over to Java.NIO, which stands for “New IO”, not as most people think “Non-blocking IO”. Our first example uses a blocking Java.NIO server, to show this.

We then write a polling non-blocking Java.NIO server, which consumes a lot of CPU, but is able to support more sockets than the blocking varieties.

Finally, we write two slightly different non-blocking servers using the Selector to react to events that might happen on our sockets.

This mini-course is designed for you to code along. By the end, you should have a working understanding of how to communicate over sockets in a blocking and non-blocking fashion.

Course Curriculum

1. Welcome

Welcome to the Transmogrifier! (2:12)

2. Single-threaded Blocking Server With Old Java.IO

2.1 Single-Threaded Blocking Server (5:20)

2.2 Single-Threaded Blocking Server Exercises (3:31)

2.3 Single-Threaded Blocking Server Exercise Solutions (6:34)

3. Multi-Threaded Blocking Server

3.1 Multi-Threaded Blocking Server (2:26)

3.2 NastyChump DoS Attack (5:59)

3.3 Refactor to Decorator Pattern Exercises (1:22)

3.4 Refactor to Decorator Pattern Exercise Solution (16:38)

3.5 Extracting Common Decorator Abstract Class (9:11)

4. ExecutorService Blocking Service

4.1 ExecutorService Blocking Server (2:31)

4.2 ExecutorService Exception Handling (8:55)

4.3 Cached vs Fixed Executor Service (4:26)

4.4 ExecutorService Blocking Server Exercises (1:36)

5. Java NIO Blocking Server with Channels

5.1 Java.NIO Blocking Server (20:41)

6. Polling Non-Blocking Server

6.1 Single Threaded Polling Non-Blocking Java.NIO Server (9:30)

6.2 Polling Non-Blocking Server Exercises (0:37)

7. Non-Blocking Server with Selector

7.1 Single-Threaded Selector-Based Non-Blocking Server (3:06)

7.2 AcceptHandler (3:31)

7.3 ReadHandler (7:25)

7.4 WriteHandler (4:30)

7.5 Putting it together (11:59)

8. Work-Pool for Transmogrifying

8.1 Non-Blocking Server with Work Pool (16:02)

9. Thank You

9.1 Thank You For Learning With Us! (0:45)