Is There a Java Equivalent to Go's `select` for Efficiently Reading from Multiple Blocking Queues?

Equivalent of Go Channel in Java

Question:

I need to efficiently read data from multiple blocking queues without creating separate reader threads. Is there an equivalent mechanism to Go's select/epoll in Java?

Answer:

Consider using the JCSP library, which provides the Alternative class. Alternative is comparable to Go's select statement. It enables you to create a single consumer thread that can multiplex data from multiple source channels without the need for constant polling.

Advantages of JCSP Alternative:

• Fair Multiplexing: Alternative ensures fairness in data consumption, preventing any input channel from being starved.
• Freedom from Deadlock: JCSP channels and Alternative are formally validated, making them highly reliable and resistant to deadlock.

Usage Example:

The following Java code demonstrates a fair multiplexer using JCSP:

import org.jcsp.lang.*;

public class FairPlex implements CSProcess {

    private final AltingChannelInput[] in;
    private final ChannelOutput out;

    public FairPlex (final AltingChannelInput[] in, final ChannelOutput out) {
      this.in = in;
      this.out = out;
    }

    public void run () {

      final Alternative alt = new Alternative (in);

      while (true) {
        final int index = alt.fairSelect ();
        out.write (in[index].read ());
      }
    }
 }

Additional Note:

The current version of JCSP in the Maven repositories is 1.1-rc5, contrary to what is stated on the JCSP website.

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