initial commit

README.md

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+To run use docker-compose or podman-compose
+
+```bash
+podman-compose down
+podman system prune -f
+podman-compose build --no-cache
+podman-compose up
+```

aeron/docker-compose.yaml

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+version: "3.8"
+
+services:
+  subscriber:
+    build: ./subscriber
+    ports:
+      - "40123:40123"
+
+  publisher:
+    build: ./publisher
+    depends_on:
+      - subscriber

aeron/publisher/Dockerfile

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+FROM eclipse-temurin:21-jdk
+
+WORKDIR /app
+
+
+ENV JAVA_TOOL_OPTIONS="--add-opens=java.base/sun.nio.ch=ALL-UNNAMED"
+
+ADD https://repo1.maven.org/maven2/io/aeron/aeron-all/1.44.1/aeron-all-1.44.1.jar aeron.jar
+ADD https://repo1.maven.org/maven2/org/agrona/agrona/1.18.1/agrona-1.18.1.jar agrona.jar
+
+COPY Publisher.java .
+
+RUN javac -cp "aeron.jar:agrona.jar" Publisher.java
+
+CMD ["java", "--add-opens=java.base/sun.nio.ch=ALL-UNNAMED", "-cp", ".:aeron.jar:agrona.jar", "Publisher"]

aeron/publisher/Publisher.java

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+import io.aeron.Aeron;
+import io.aeron.Publication;
+import io.aeron.driver.MediaDriver;
+import org.agrona.concurrent.UnsafeBuffer;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+
+public class Publisher {
+  public static void main(String[] args) throws Exception {
+    MediaDriver driver = MediaDriver.launchEmbedded();
+
+    Aeron.Context ctx = new Aeron.Context()
+        .aeronDirectoryName(driver.aeronDirectoryName());
+
+    Aeron aeron = Aeron.connect(ctx);
+
+    String channel = "aeron:udp?endpoint=subscriber:40123";
+    int streamId = 1001;
+
+    Publication publication = aeron.addPublication(channel, streamId);
+    UnsafeBuffer buffer = new UnsafeBuffer(ByteBuffer.allocateDirect(256));
+
+    long counter = 0;
+
+    System.out.println("Publisher ready");
+
+    while (true) {
+      long timestamp = System.currentTimeMillis();
+      String msg = counter + "," + timestamp;
+
+      buffer.setMemory(0, buffer.capacity(), (byte) 0);
+
+      byte[] bytes = msg.getBytes(StandardCharsets.UTF_8);
+      buffer.putBytes(0, bytes);
+
+      long result;
+      do {
+        result = publication.offer(buffer, 0, bytes.length);
+        if (result < 0)
+          Thread.yield();
+      } while (result < 0);
+
+      System.out.println("Sent: " + msg);
+      counter++;
+      Thread.sleep(1000);
+    }
+  }
+}

aeron/subscriber/Dockerfile

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+FROM eclipse-temurin:21-jdk
+
+WORKDIR /app
+
+ENV JAVA_TOOL_OPTIONS="--add-opens=java.base/sun.nio.ch=ALL-UNNAMED"
+
+ADD https://repo1.maven.org/maven2/io/aeron/aeron-all/1.44.1/aeron-all-1.44.1.jar aeron.jar
+ADD https://repo1.maven.org/maven2/org/agrona/agrona/1.18.1/agrona-1.18.1.jar agrona.jar
+
+COPY Subscriber.java .
+
+RUN javac -cp "aeron.jar:agrona.jar" Subscriber.java
+
+CMD ["java", "--add-opens=java.base/sun.nio.ch=ALL-UNNAMED", "-cp", ".:aeron.jar:agrona.jar", "Subscriber"]

aeron/subscriber/Subscriber.java

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+import io.aeron.Aeron;
+import io.aeron.Subscription;
+import io.aeron.Image;
+import io.aeron.driver.MediaDriver;
+import io.aeron.logbuffer.FragmentHandler;
+import org.agrona.DirectBuffer;
+import org.agrona.concurrent.BackoffIdleStrategy;
+import org.agrona.concurrent.IdleStrategy;
+
+import java.nio.charset.StandardCharsets;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class Subscriber {
+
+  public static void main(String[] args) {
+    final AtomicBoolean running = new AtomicBoolean(true);
+
+    MediaDriver driver = MediaDriver.launchEmbedded();
+
+    Aeron.Context ctx = new Aeron.Context()
+        .availableImageHandler((Image img) -> System.out.println("Publisher available: " + img.sourceIdentity()))
+        .unavailableImageHandler((Image img) -> System.out.println("Publisher gone: " + img.sourceIdentity()))
+        .aeronDirectoryName(driver.aeronDirectoryName());
+
+    Aeron aeron = Aeron.connect(ctx);
+
+    String channel = "aeron:udp?endpoint=0.0.0.0:40123";
+    int streamId = 1001;
+
+    Subscription sub = aeron.addSubscription(channel, streamId);
+    IdleStrategy idleStrategy = new BackoffIdleStrategy(1, 1, 1, 1);
+
+    System.out.println("Subscriber ready, waiting for messages...");
+
+    // Fragment handler
+    FragmentHandler handler = (DirectBuffer buffer, int offset, int length, io.aeron.logbuffer.Header header) -> {
+      String msg = buffer.getStringWithoutLengthUtf8(offset, length).trim();
+      System.out.println("RAW MESSAGE: '" + msg + "'");
+
+      String[] parts = msg.split(",");
+      if (parts.length == 2) {
+        try {
+          long counter = Long.parseLong(parts[0].trim());
+          long sendTime = Long.parseLong(parts[1].trim());
+          long latency = System.currentTimeMillis() - sendTime;
+
+          System.out.printf("Received: %d | Latency: %d ms%n", counter, latency);
+        } catch (NumberFormatException e) {
+          System.err.println("Failed to parse message: " + msg);
+        }
+      } else {
+        System.err.println("Malformed message: " + msg);
+      }
+    };
+
+    while (running.get()) {
+      int fragments = sub.poll(handler, 10);
+      idleStrategy.idle(fragments);
+    }
+
+    sub.close();
+    aeron.close();
+    driver.close();
+  }
+}

natsio/docker-compose.yaml

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+version: "3.8"
+
+services:
+  nats:
+    image: nats:2.10
+    ports:
+      - "4222:4222"
+
+  subscriber:
+    build: ./subscriber
+    depends_on:
+      - nats
+
+  publisher:
+    build: ./publisher
+    depends_on:
+      - nats

natsio/publisher/Dockerfile

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+FROM eclipse-temurin:21-jdk
+
+WORKDIR /app
+
+ADD https://repo1.maven.org/maven2/io/nats/jnats/2.16.14/jnats-2.16.14.jar nats.jar
+
+COPY Publisher.java .
+
+RUN javac -cp nats.jar Publisher.java
+
+CMD ["java", "-cp", ".:nats.jar", "Publisher"]

natsio/publisher/Publisher.java

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+import io.nats.client.Connection;
+import io.nats.client.Nats;
+import java.time.Duration;
+
+public class Publisher {
+  public static void main(String[] args) throws Exception {
+    Connection nc = Nats.connect("nats://nats:4222");
+
+    int counter = 0;
+
+    while (true) {
+      long sendTime = System.currentTimeMillis();
+      String msg = counter + "," + sendTime;
+      nc.publish("demo.subject", msg.getBytes());
+      nc.flush(Duration.ofSeconds(1));
+
+      System.out.println("Sent: " + counter);
+      counter++;
+      Thread.sleep(1000);
+    }
+  }
+}

natsio/subscriber/Dockerfile

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+FROM eclipse-temurin:21-jdk
+
+WORKDIR /app
+
+ADD https://repo1.maven.org/maven2/io/nats/jnats/2.16.14/jnats-2.16.14.jar nats.jar
+
+COPY Subscriber.java .
+
+RUN javac -cp nats.jar Subscriber.java
+
+CMD ["java", "-cp", ".:nats.jar", "Subscriber"]

natsio/subscriber/Subscriber.java

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+import io.nats.client.Connection;
+import io.nats.client.Dispatcher;
+import io.nats.client.Nats;
+
+public class Subscriber {
+  public static void main(String[] args) throws Exception {
+    Connection nc = Nats.connect("nats://nats:4222");
+
+    Dispatcher dispatcher = nc.createDispatcher(msg -> {
+      String received = new String(msg.getData()).trim();
+      String[] parts = received.split(",");
+      if (parts.length >= 2) {
+        int counter = Integer.parseInt(parts[0].trim());
+        long sendTime = Long.parseLong(parts[1].trim());
+        long latency = System.currentTimeMillis() - sendTime;
+
+        System.out.printf("Received: %d | Latency: %d ms%n", counter, latency);
+      }
+    });
+
+    dispatcher.subscribe("demo.subject");
+
+    Thread.sleep(Long.MAX_VALUE);
+  }
+}