initial version

src/wuerfel/Start.java

+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package wuerfel;
+
+import javax.swing.JOptionPane;
+import javax.swing.UIManager;
+import wuerfel.controller.StartStopController;
+import wuerfel.controller.WertAdapter;
+import wuerfel.model.WuerfelModel;
+import wuerfel.view.WuerfelView;
+
+/**
+ *
+ * @author leo
+ */
+public class Start
+{
+    public Start()
+    {
+        WuerfelView view = new WuerfelView();
+        WuerfelModel model = new WuerfelModel();
+        StartStopController controller = new StartStopController(view, model);
+        controller.registerEvents();
+        WertAdapter wAdapter = new WertAdapter(view, model);
+        wAdapter.einschreiben();
+        view.setVisible(true);
+    }
+    
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args)
+    {
+        try
+        {
+            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+        }
+        catch (Exception ex)
+        {
+            JOptionPane.showMessageDialog(null, ex.toString());
+        }
+        
+        new Start();
+    }
+    
+}

src/wuerfel/controller/StartStopController.java

+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package wuerfel.controller;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import wuerfel.model.WuerfelModel;
+import wuerfel.view.WuerfelView;
+
+/**
+ *
+ * @author leo
+ */
+public class StartStopController implements ActionListener
+{
+    private WuerfelView view;
+    private WuerfelModel model;
+    
+    public StartStopController(WuerfelView view, WuerfelModel model)
+    {
+        this.view = view;
+        this.model = model;
+    }
+    
+    public void registerEvents()
+    {
+        view.getBtnStart().addActionListener(this);
+        view.getBtnStop().addActionListener(this);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e)
+    {
+        if (e.getSource() == view.getBtnStart())
+        {
+            model.start();
+        }
+        else
+        {
+            model.stop();
+        }
+    }
+}

src/wuerfel/controller/WertAdapter.java

+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package wuerfel.controller;
+
+import java.util.concurrent.Flow;
+import java.util.concurrent.Flow.Subscriber;
+import java.util.concurrent.Flow.Subscription;
+import javax.swing.JOptionPane;
+import wuerfel.model.WuerfelModel;
+import wuerfel.view.WuerfelView;
+
+/**
+ *
+ * @author leo
+ */
+public class WertAdapter implements Subscriber<Integer>
+{
+    private WuerfelView view;
+    private WuerfelModel model;
+    private Subscription subscription;
+    
+    public WertAdapter(WuerfelView view, WuerfelModel model)
+    {
+        this.view = view;
+        this.model = model;
+    }
+    
+    public void einschreiben()
+    {
+        model.addWertSubscription(this);
+    }
+
+    @Override
+    public void onSubscribe(Flow.Subscription subscription)
+    {
+        this.subscription = subscription;           // wird bei onNext und onError gebraucht
+        subscription.request(1);                    // 1 Wert bekommen
+    }
+
+    @Override
+    public void onNext(Integer item)
+    {
+        String strWert = String.valueOf(item);      // Wert in String umwandeln
+        view.getLblWert().setText(strWert);
+        
+        subscription.request(1);                // für nächsten Wert anmelden
+    }
+
+    @Override
+    public void onError(Throwable throwable)
+    {
+        JOptionPane.showMessageDialog(view, throwable.toString());
+    }
+
+    @Override
+    public void onComplete()                    // Fertig
+    {
+        
+    }
+    
+}

src/wuerfel/model/WuerfelModel.java

+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package wuerfel.model;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Flow.Subscriber;
+import java.util.concurrent.SubmissionPublisher;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ *
+ * @author leo
+ */
+public class WuerfelModel implements Runnable
+{
+    private int wert;
+    private volatile boolean laufend;
+    private SubmissionPublisher<Integer> iPublisher;
+    private ExecutorService eService;
+    
+    public WuerfelModel()
+    {
+        wert = 1;
+        laufend = false;
+        iPublisher = new SubmissionPublisher<>();
+        eService = Executors.newSingleThreadExecutor();         // ein einziger nebenläufiger Thread
+    }
+    
+    public void addWertSubscription(Subscriber<Integer> subscriber)
+    {
+        iPublisher.subscribe(subscriber);
+    }
+    
+    public void start()
+    {
+        laufend = true;
+        
+        eService.submit(this);      // Thread starten   
+        notifyAll();
+    }
+    
+    
+    public void stop()
+    {
+        laufend = false;
+    }
+
+    @Override
+    public void run() {
+        
+        while (laufend)
+        //while (true)
+        {
+            try
+            {
+                wert++;
+                if (wert > 6)
+                {
+                    wert = 1;
+                }
+                Thread.sleep(100);
+            }
+            catch (Exception e)
+            {
+                System.err.println(e);
+            }
+            
+            //if (laufend)
+                iPublisher.submit(wert);
+        }
+        
+        while (!laufend)
+        {
+            try {
+                wait();
+            } catch (InterruptedException ex) {
+                Logger.getLogger(WuerfelModel.class.getName()).log(Level.SEVERE, null, ex);
+            }
+        }
+
+        
+    }
+}

src/wuerfel/view/WuerfelView.form

+<?xml version="1.0" encoding="UTF-8" ?>
+
+<Form version="1.3" maxVersion="1.9" type="org.netbeans.modules.form.forminfo.JFrameFormInfo">
+  <Properties>
+    <Property name="defaultCloseOperation" type="int" value="3"/>
+  </Properties>
+  <SyntheticProperties>
+    <SyntheticProperty name="formSize" type="java.awt.Dimension" value="-84,-19,0,5,115,114,0,18,106,97,118,97,46,97,119,116,46,68,105,109,101,110,115,105,111,110,65,-114,-39,-41,-84,95,68,20,2,0,2,73,0,6,104,101,105,103,104,116,73,0,5,119,105,100,116,104,120,112,0,0,2,27,0,0,3,48"/>
+    <SyntheticProperty name="formSizePolicy" type="int" value="0"/>
+    <SyntheticProperty name="generateSize" type="boolean" value="true"/>
+    <SyntheticProperty name="generateCenter" type="boolean" value="true"/>
+  </SyntheticProperties>
+  <AuxValues>
+    <AuxValue name="FormSettings_autoResourcing" type="java.lang.Integer" value="0"/>
+    <AuxValue name="FormSettings_autoSetComponentName" type="java.lang.Boolean" value="false"/>
+    <AuxValue name="FormSettings_generateFQN" type="java.lang.Boolean" value="true"/>
+    <AuxValue name="FormSettings_generateMnemonicsCode" type="java.lang.Boolean" value="false"/>
+    <AuxValue name="FormSettings_i18nAutoMode" type="java.lang.Boolean" value="false"/>
+    <AuxValue name="FormSettings_layoutCodeTarget" type="java.lang.Integer" value="1"/>
+    <AuxValue name="FormSettings_listenerGenerationStyle" type="java.lang.Integer" value="0"/>
+    <AuxValue name="FormSettings_variablesLocal" type="java.lang.Boolean" value="false"/>
+    <AuxValue name="FormSettings_variablesModifier" type="java.lang.Integer" value="2"/>
+  </AuxValues>
+
+  <Layout class="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout"/>
+  <SubComponents>
+    <Container class="javax.swing.JPanel" name="pnlTop">
+      <Constraints>
+        <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout" value="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout$BorderConstraintsDescription">
+          <BorderConstraints direction="First"/>
+        </Constraint>
+      </Constraints>
+
+      <Layout class="org.netbeans.modules.form.compat2.layouts.DesignFlowLayout"/>
+      <SubComponents>
+        <Component class="javax.swing.JButton" name="btnStart">
+          <Properties>
+            <Property name="text" type="java.lang.String" value="Start"/>
+          </Properties>
+        </Component>
+        <Component class="javax.swing.JButton" name="btnStop">
+          <Properties>
+            <Property name="text" type="java.lang.String" value="Stop"/>
+          </Properties>
+        </Component>
+      </SubComponents>
+    </Container>
+    <Container class="javax.swing.JPanel" name="pnlMain">
+      <Constraints>
+        <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout" value="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout$BorderConstraintsDescription">
+          <BorderConstraints direction="Center"/>
+        </Constraint>
+      </Constraints>
+
+      <Layout class="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout"/>
+      <SubComponents>
+        <Component class="javax.swing.JLabel" name="lblWert">
+          <Properties>
+            <Property name="font" type="java.awt.Font" editor="org.netbeans.beaninfo.editors.FontEditor">
+              <Font name="Tahoma" size="48" style="0"/>
+            </Property>
+            <Property name="horizontalAlignment" type="int" value="0"/>
+            <Property name="text" type="java.lang.String" value="1"/>
+          </Properties>
+          <Constraints>
+            <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout" value="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout$BorderConstraintsDescription">
+              <BorderConstraints direction="Center"/>
+            </Constraint>
+          </Constraints>
+        </Component>
+      </SubComponents>
+    </Container>
+  </SubComponents>
+</Form>

src/wuerfel/view/WuerfelView.java

+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package wuerfel.view;
+
+/**
+ *
+ * @author leo
+ */
+public class WuerfelView extends javax.swing.JFrame {
+
+    /**
+     * @return the btnStart
+     */
+    public javax.swing.JButton getBtnStart() {
+        return btnStart;
+    }
+
+    /**
+     * @return the btnStop
+     */
+    public javax.swing.JButton getBtnStop() {
+        return btnStop;
+    }
+
+    /**
+     * @return the lblWert
+     */
+    public javax.swing.JLabel getLblWert() {
+        return lblWert;
+    }
+
+    /**
+     * Creates new form WuerfelView
+     */
+    public WuerfelView() {
+        initComponents();
+    }
+
+    /**
+     * This method is called from within the constructor to initialize the form.
+     * WARNING: Do NOT modify this code. The content of this method is always
+     * regenerated by the Form Editor.
+     */
+    @SuppressWarnings("unchecked")
+    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
+    private void initComponents() {
+
+        pnlTop = new javax.swing.JPanel();
+        btnStart = new javax.swing.JButton();
+        btnStop = new javax.swing.JButton();
+        pnlMain = new javax.swing.JPanel();
+        lblWert = new javax.swing.JLabel();
+
+        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
+
+        btnStart.setText("Start");
+        pnlTop.add(btnStart);
+
+        btnStop.setText("Stop");
+        pnlTop.add(btnStop);
+
+        getContentPane().add(pnlTop, java.awt.BorderLayout.PAGE_START);
+
+        pnlMain.setLayout(new java.awt.BorderLayout());
+
+        lblWert.setFont(new java.awt.Font("Tahoma", 0, 48)); // NOI18N
+        lblWert.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
+        lblWert.setText("1");
+        pnlMain.add(lblWert, java.awt.BorderLayout.CENTER);
+
+        getContentPane().add(pnlMain, java.awt.BorderLayout.CENTER);
+
+        setSize(new java.awt.Dimension(816, 539));
+        setLocationRelativeTo(null);
+    }// </editor-fold>//GEN-END:initComponents
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String args[]) {
+        /* Set the Nimbus look and feel */
+        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
+        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
+         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
+         */
+        try {
+            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
+                if ("Nimbus".equals(info.getName())) {
+                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
+                    break;
+                }
+            }
+        } catch (ClassNotFoundException ex) {
+            java.util.logging.Logger.getLogger(WuerfelView.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (InstantiationException ex) {
+            java.util.logging.Logger.getLogger(WuerfelView.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (IllegalAccessException ex) {
+            java.util.logging.Logger.getLogger(WuerfelView.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
+            java.util.logging.Logger.getLogger(WuerfelView.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        }
+        //</editor-fold>
+
+        /* Create and display the form */
+        java.awt.EventQueue.invokeLater(new Runnable() {
+            public void run() {
+                new WuerfelView().setVisible(true);
+            }
+        });
+    }
+
+    // Variables declaration - do not modify//GEN-BEGIN:variables
+    private javax.swing.JButton btnStart;
+    private javax.swing.JButton btnStop;
+    private javax.swing.JLabel lblWert;
+    private javax.swing.JPanel pnlMain;
+    private javax.swing.JPanel pnlTop;
+    // End of variables declaration//GEN-END:variables
+}