Add SIN.04028 tutorial material, tutor prompt and conversation log

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

SIN.04028-From-Calling-to-Eventing/supplemental-java/02-static-in-jvm/StaticQueueRot13.java

@@ -0,0 +1,88 @@
+record Message(String type, String value) {}
+
+Map<String, BlockingQueue<Message>> mailboxes =
+    new ConcurrentHashMap<>();
+
+BlockingQueue<Message> mailbox(String name) {
+    return mailboxes.computeIfAbsent(
+        name,
+        _ -> new LinkedBlockingQueue<>()
+    );
+}
+
+String rot13(String text) {
+    var result = new StringBuilder();
+
+    for (var character : text.toCharArray()) {
+        if (character >= 'a' && character <= 'z')
+            character = (char) ('a' + (character - 'a' + 13) % 26);
+        else if (character >= 'A' && character <= 'Z')
+            character = (char) ('A' + (character - 'A' + 13) % 26);
+
+        result.append(character);
+    }
+
+    return result.toString();
+}
+
+void mediate(String from, String to) {
+    try {
+        while (true)
+            mailbox(to).put(mailbox(from).take());
+    } catch (InterruptedException _) {
+        Thread.currentThread().interrupt();
+    }
+}
+
+void runConsoleIn() {
+    try {
+        while (true) {
+            var text = IO.readln();
+
+            if (text == null)
+                return;
+
+            mailbox("consoleIn.outbox")
+                .put(new Message("TEXT", text));
+        }
+    } catch (InterruptedException _) {
+        Thread.currentThread().interrupt();
+    }
+}
+
+void runRot13() {
+    try {
+        while (true) {
+            var input = mailbox("rot13.inbox").take();
+            var output = new Message("TEXT", rot13(input.value()));
+            mailbox("rot13.outbox").put(output);
+        }
+    } catch (InterruptedException _) {
+        Thread.currentThread().interrupt();
+    }
+}
+
+void runConsoleOut() {
+    try {
+        while (true)
+            IO.println(mailbox("consoleOut.inbox").take().value());
+    } catch (InterruptedException _) {
+        Thread.currentThread().interrupt();
+    }
+}
+
+void main() throws InterruptedException {
+    Thread.ofVirtual().start(this::runConsoleIn);
+    Thread.ofVirtual().start(this::runRot13);
+    Thread.ofVirtual().start(this::runConsoleOut);
+
+    Thread.ofVirtual().start(
+        () -> mediate("consoleIn.outbox", "rot13.inbox")
+    );
+
+    Thread.ofVirtual().start(
+        () -> mediate("rot13.outbox", "consoleOut.inbox")
+    );
+
+    Thread.currentThread().join();
+}