Class Topology

  • All Implemented Interfaces:
    java.awt.event.WindowListener, java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable, java.util.EventListener, javax.accessibility.Accessible, MembershipListener

    public class Topology
    extends java.awt.Frame
    implements java.awt.event.WindowListener, MembershipListener
    Demonstrates the membership service. Each member is represented by a rectangle that contains the addresses of all the members. The coordinator (= oldest member in the group) is painted in blue. New members can be started; all existing members will update their graphical appearance to reflect the new membership. When the coordinator itself is killed, another one will take over (the next in rank).

    A nice demo is to start a number of Topology instances at the same time. All of them will be blue (all are coordinators since they don't find each other). Then the MERGE2 protocol sets in and only one will retain its coordinator role.

    Author:
    Bela Ban
    See Also:
    Serialized Form
    To do:
    Needs to be ported to Swing.
    • Nested Class Summary

      • Nested classes/interfaces inherited from class java.awt.Frame

        java.awt.Frame.AccessibleAWTFrame
      • Nested classes/interfaces inherited from class java.awt.Window

        java.awt.Window.AccessibleAWTWindow, java.awt.Window.Type
      • Nested classes/interfaces inherited from class java.awt.Container

        java.awt.Container.AccessibleAWTContainer
      • Nested classes/interfaces inherited from class java.awt.Component

        java.awt.Component.AccessibleAWTComponent, java.awt.Component.BaselineResizeBehavior, java.awt.Component.BltBufferStrategy, java.awt.Component.FlipBufferStrategy
    • Field Summary

      • Fields inherited from class java.awt.Frame

        CROSSHAIR_CURSOR, DEFAULT_CURSOR, E_RESIZE_CURSOR, HAND_CURSOR, ICONIFIED, MAXIMIZED_BOTH, MAXIMIZED_HORIZ, MAXIMIZED_VERT, MOVE_CURSOR, N_RESIZE_CURSOR, NE_RESIZE_CURSOR, NORMAL, NW_RESIZE_CURSOR, S_RESIZE_CURSOR, SE_RESIZE_CURSOR, SW_RESIZE_CURSOR, TEXT_CURSOR, W_RESIZE_CURSOR, WAIT_CURSOR
      • Fields inherited from class java.awt.Component

        accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
      • Fields inherited from interface java.awt.image.ImageObserver

        ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
    • Constructor Summary

      Constructors 
      Constructor Description
      Topology()  
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void addNode​(java.lang.Object member)  
      void block()
      Called (usually by the FLUSH protocol), as an indication that the member should stop sending messages.
      void coordinatorChosen()  
      void drawNode​(java.awt.Graphics g, int x, int y, java.lang.String label, int style)  
      void drawTopology​(java.awt.Graphics g)  
      static void main​(java.lang.String[] args)  
      void paint​(java.awt.Graphics g)  
      void removeNode​(java.lang.Object member)  
      void setState​(java.util.Vector mbrs)  
      void start()  
      void suspect​(Address suspected_mbr)
      Called whenever a member is suspected of having crashed, but has not yet been excluded.
      void viewAccepted​(View view)
      Called when a change in membership has occurred.
      void windowActivated​(java.awt.event.WindowEvent e)  
      void windowClosed​(java.awt.event.WindowEvent e)  
      void windowClosing​(java.awt.event.WindowEvent e)  
      void windowDeactivated​(java.awt.event.WindowEvent e)  
      void windowDeiconified​(java.awt.event.WindowEvent e)  
      void windowIconified​(java.awt.event.WindowEvent e)  
      void windowOpened​(java.awt.event.WindowEvent e)  
      • Methods inherited from class java.awt.Frame

        addNotify, getAccessibleContext, getCursorType, getExtendedState, getFrames, getIconImage, getMaximizedBounds, getMenuBar, getState, getTitle, isResizable, isUndecorated, paramString, remove, removeNotify, setBackground, setCursor, setExtendedState, setIconImage, setMaximizedBounds, setMenuBar, setOpacity, setResizable, setShape, setState, setTitle, setUndecorated
      • Methods inherited from class java.awt.Window

        addPropertyChangeListener, addPropertyChangeListener, addWindowFocusListener, addWindowListener, addWindowStateListener, applyResourceBundle, applyResourceBundle, createBufferStrategy, createBufferStrategy, dispose, getBackground, getBufferStrategy, getFocusableWindowState, getFocusCycleRootAncestor, getFocusOwner, getFocusTraversalKeys, getIconImages, getInputContext, getListeners, getLocale, getModalExclusionType, getMostRecentFocusOwner, getOpacity, getOwnedWindows, getOwner, getOwnerlessWindows, getShape, getToolkit, getType, getWarningString, getWindowFocusListeners, getWindowListeners, getWindows, getWindowStateListeners, hide, isActive, isAlwaysOnTop, isAlwaysOnTopSupported, isAutoRequestFocus, isFocusableWindow, isFocusCycleRoot, isFocused, isLocationByPlatform, isOpaque, isShowing, isValidateRoot, pack, postEvent, processEvent, processWindowEvent, processWindowFocusEvent, processWindowStateEvent, removeWindowFocusListener, removeWindowListener, removeWindowStateListener, reshape, setAlwaysOnTop, setAutoRequestFocus, setBounds, setBounds, setCursor, setFocusableWindowState, setFocusCycleRoot, setIconImages, setLocation, setLocation, setLocationByPlatform, setLocationRelativeTo, setMinimumSize, setModalExclusionType, setSize, setSize, setType, setVisible, show, toBack, toFront
      • Methods inherited from class java.awt.Container

        add, add, add, add, add, addContainerListener, addImpl, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalPolicy, getInsets, getLayout, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, setLayout, transferFocusDownCycle, update, validate, validateTree
      • Methods inherited from class java.awt.Component

        action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, resize, resize, revalidate, setComponentOrientation, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setMaximumSize, setMixingCutoutShape, setName, setPreferredSize, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
      • Methods inherited from interface java.awt.MenuContainer

        getFont, postEvent
    • Constructor Detail

      • Topology

        public Topology()
    • Method Detail

      • addNode

        public void addNode​(java.lang.Object member)
      • removeNode

        public void removeNode​(java.lang.Object member)
      • drawNode

        public void drawNode​(java.awt.Graphics g,
                             int x,
                             int y,
                             java.lang.String label,
                             int style)
      • drawTopology

        public void drawTopology​(java.awt.Graphics g)
      • paint

        public void paint​(java.awt.Graphics g)
        Overrides:
        paint in class java.awt.Window
      • viewAccepted

        public void viewAccepted​(View view)
        Description copied from interface: MembershipListener
        Called when a change in membership has occurred. No long running actions or sending of messages should be done in this callback. If some long running action needs to be performed, it should be done in a separate thread.

        Note that on reception of the first view (a new member just joined), the channel will not yet be in the connected state. This only happens when Channel.connect(String) returns.

        Specified by:
        viewAccepted in interface MembershipListener
      • suspect

        public void suspect​(Address suspected_mbr)
        Description copied from interface: MembershipListener
        Called whenever a member is suspected of having crashed, but has not yet been excluded.
        Specified by:
        suspect in interface MembershipListener
      • block

        public void block()
        Description copied from interface: MembershipListener
        Called (usually by the FLUSH protocol), as an indication that the member should stop sending messages. Any messages sent after returning from this callback might get blocked by the FLUSH protocol. When the FLUSH protocol is done, and messages can be sent again, the FLUSH protocol will simply unblock all pending messages. If a callback for unblocking is desired, implement ExtendedMembershipListener.unblock(). Note that block() is the equivalent of reception of a BlockEvent in the pull mode.
        Specified by:
        block in interface MembershipListener
      • setState

        public void setState​(java.util.Vector mbrs)
      • coordinatorChosen

        public void coordinatorChosen()
      • windowActivated

        public void windowActivated​(java.awt.event.WindowEvent e)
        Specified by:
        windowActivated in interface java.awt.event.WindowListener
      • windowClosed

        public void windowClosed​(java.awt.event.WindowEvent e)
        Specified by:
        windowClosed in interface java.awt.event.WindowListener
      • windowClosing

        public void windowClosing​(java.awt.event.WindowEvent e)
        Specified by:
        windowClosing in interface java.awt.event.WindowListener
      • windowDeactivated

        public void windowDeactivated​(java.awt.event.WindowEvent e)
        Specified by:
        windowDeactivated in interface java.awt.event.WindowListener
      • windowDeiconified

        public void windowDeiconified​(java.awt.event.WindowEvent e)
        Specified by:
        windowDeiconified in interface java.awt.event.WindowListener
      • windowIconified

        public void windowIconified​(java.awt.event.WindowEvent e)
        Specified by:
        windowIconified in interface java.awt.event.WindowListener
      • windowOpened

        public void windowOpened​(java.awt.event.WindowEvent e)
        Specified by:
        windowOpened in interface java.awt.event.WindowListener
      • start

        public void start()
                   throws java.lang.Exception
        Throws:
        java.lang.Exception
      • main

        public static void main​(java.lang.String[] args)