Title here
Summary here
Channel Directions in Fortress
Channel Directions in Java can be simulated using BlockingQueue. While Java doesn’t have built-in channel direction specifications, we can achieve similar behavior using interfaces.
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
public class ChannelDirections {
// This ping method only accepts a queue for sending values.
// It would be a compile-time error to try to receive from this queue.
public static void ping(BlockingQueue<String> pings, String msg) throws InterruptedException {
pings.put(msg);
}
// The pong method accepts one queue for receives (pings) and a second for sends (pongs).
public static void pong(BlockingQueue<String> pings, BlockingQueue<String> pongs) throws InterruptedException {
String msg = pings.take();
pongs.put(msg);
}
public static void main(String[] args) throws InterruptedException {
BlockingQueue<String> pings = new LinkedBlockingQueue<>(1);
BlockingQueue<String> pongs = new LinkedBlockingQueue<>(1);
ping(pings, "passed message");
pong(pings, pongs);
System.out.println(pongs.take());
}
}In this Java example, we use BlockingQueue to simulate channels. The LinkedBlockingQueue with a capacity of 1 is used to mimic the behavior of unbuffered channels in Go.
The ping method only puts (sends) a message to the queue, while the pong method takes (receives) from one queue and puts (sends) to another.
In the main method, we create two queues, send a message through ping, pass it through pong, and finally print the received message.
To run this program:
$ javac ChannelDirections.java
$ java ChannelDirections
passed messageThis example demonstrates how to implement unidirectional channel-like behavior in Java using BlockingQueue. While it’s not as straightforward as Go’s channel directions, it provides similar functionality in terms of type-safety and direction specification.