From c08f4d3196ccf72a0f669ee0c9882ad3fb8ef5d2 Mon Sep 17 00:00:00 2001
From: Sebastian Brosch <i23009@hb.dhbw-stuttgart.de>
Date: Thu, 30 May 2024 11:27:24 +0200
Subject: [PATCH] Vorlesung 14 / Aufgabe 2

---
 VL14/Aufgabe02/Aufgabe02.java    | 27 +++++++++++++++++++++++++++
 VL14/Aufgabe02/Printer.java      | 23 +++++++++++++++++++++++
 VL14/Aufgabe02/PrinterQueue.java | 12 ++++++++++++
 VL14/Aufgabe02/User.java         | 23 +++++++++++++++++++++++
 4 files changed, 85 insertions(+)
 create mode 100644 VL14/Aufgabe02/Aufgabe02.java
 create mode 100644 VL14/Aufgabe02/Printer.java
 create mode 100644 VL14/Aufgabe02/PrinterQueue.java
 create mode 100644 VL14/Aufgabe02/User.java

diff --git a/VL14/Aufgabe02/Aufgabe02.java b/VL14/Aufgabe02/Aufgabe02.java
new file mode 100644
index 0000000..ce2ee14
--- /dev/null
+++ b/VL14/Aufgabe02/Aufgabe02.java
@@ -0,0 +1,27 @@
+package VL14.Aufgabe02;
+
+/**
+ * Vorlesung 14 / Aufgabe 2
+ *
+ * @author Sebastian Brosch
+ */
+public class Aufgabe02 {
+  public static void main(String[] args) {
+    final int NUMBER_OF_USERS = 5;
+    final int NUMBER_OF_PRINTERS = 2;
+
+    // create some users.
+    for (int u = 0; u < NUMBER_OF_USERS; u++) {
+      User user = new User();
+      Thread threadUser = new Thread(user);
+      threadUser.start();
+    }
+
+    // create some printers.
+    for (int p = 0; p < NUMBER_OF_PRINTERS; p++) {
+      Printer printer = new Printer();
+      Thread threadPrinter = new Thread(printer);
+      threadPrinter.start();
+    }
+  }
+}
diff --git a/VL14/Aufgabe02/Printer.java b/VL14/Aufgabe02/Printer.java
new file mode 100644
index 0000000..f2ac402
--- /dev/null
+++ b/VL14/Aufgabe02/Printer.java
@@ -0,0 +1,23 @@
+package VL14.Aufgabe02;
+
+/**
+ * Class which represents a printer.
+ *
+ * @author Sebastian Brosch
+ */
+public class Printer implements Runnable {
+  public void run() {
+    while (true) {
+      synchronized (PrinterQueue.queue) {
+        if (PrinterQueue.queue.size() > 0) {
+          System.out.println(PrinterQueue.queue.poll());
+        }
+      }
+
+      try {
+        Thread.sleep(500);
+      } catch (InterruptedException e) {
+      }
+    }
+  }
+}
diff --git a/VL14/Aufgabe02/PrinterQueue.java b/VL14/Aufgabe02/PrinterQueue.java
new file mode 100644
index 0000000..e3e78ee
--- /dev/null
+++ b/VL14/Aufgabe02/PrinterQueue.java
@@ -0,0 +1,12 @@
+package VL14.Aufgabe02;
+
+import java.util.LinkedList;
+
+/**
+ * Class which represents a printer queue.
+ *
+ * @author Sebastian Brosch
+ */
+public class PrinterQueue {
+  static LinkedList<String> queue = new LinkedList<String>();
+}
diff --git a/VL14/Aufgabe02/User.java b/VL14/Aufgabe02/User.java
new file mode 100644
index 0000000..361eb7d
--- /dev/null
+++ b/VL14/Aufgabe02/User.java
@@ -0,0 +1,23 @@
+package VL14.Aufgabe02;
+
+/**
+ * Class which represents a user.
+ *
+ * @author Sebastian Brosch
+ */
+public class User implements Runnable {
+  private int number = 0;
+
+  public void run() {
+    while (true) {
+      synchronized (PrinterQueue.queue) {
+        PrinterQueue.queue.add(Thread.currentThread().getName() + ": " + this.number++);
+      }
+
+      try {
+        Thread.sleep(100);
+      } catch (InterruptedException e) {
+      }
+    }
+  }
+}