Draw (JGroups 2.12.3.Final API)

java.lang.Object
- org.jgroups.ExtendedReceiverAdapter
- - org.jgroups.demos.Draw

All Implemented Interfaces:

ActionListener, EventListener, ChannelListener, ExtendedMembershipListener, ExtendedMessageListener, ExtendedReceiver, MembershipListener, MessageListener, Receiver
```
public class Draw
extends ExtendedReceiverAdapter
implements ActionListener, ChannelListener
```
Shared whiteboard, each new instance joins the same group. Each instance chooses a random color, mouse moves are broadcast to all group members, which then apply them to their canvas

Author:

Bela Ban, Oct 17 2001

Constructor Summary

Constructors
Constructor and Description
`Draw(Channel channel)`
`Draw(Channel channel, boolean use_state, long state_timeout)`
`Draw(String props, boolean no_channel, boolean jmx, boolean use_state, long state_timeout, boolean use_blocking, boolean use_unicasts, String name)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`actionPerformed(ActionEvent e)`
`void`	`block()` Called (usually by the FLUSH protocol), as an indication that the member should stop sending messages.
`void`	`channelClosed(Channel channel)`
`void`	`channelConnected(Channel channel)`
`void`	`channelDisconnected(Channel channel)`
`void`	`channelReconnected(Address addr)`
`void`	`channelShunned()`
`void`	`clearPanel()`
`String`	`getGroupName()`
`byte[]`	`getState()` Answers the group state; e.g., when joining.
`void`	`getState(OutputStream ostream)` Allows an application to write a state through a provided OutputStream.
`void`	`go()`
`static void`	`main(String[] args)`
`void`	`receive(Message msg)` Called when a message is received.
`void`	`sendClearPanelMsg()`
`void`	`setGroupName(String groupname)`
`void`	`setState(byte[] state)` Sets the group state; e.g., when joining.
`void`	`setState(InputStream istream)` Allows an application to read a state through a provided InputStream.
`void`	`stop()`
`void`	`unblock()` Called after the FLUSH protocol has unblocked previously blocked senders, and messages can be sent again.
`void`	`viewAccepted(View v)` Called when a change in membership has occurred.

Methods inherited from class org.jgroups.ExtendedReceiverAdapter
getState, getState, setState, setState, suspect

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Draw
```
public Draw(String props,
            boolean no_channel,
            boolean jmx,
            boolean use_state,
            long state_timeout,
            boolean use_blocking,
            boolean use_unicasts,
            String name)
     throws Exception
```
    Throws:
    
    Exception
  - Draw
```
public Draw(Channel channel)
     throws Exception
```
    Throws:
    
    Exception
  - Draw
```
public Draw(Channel channel,
            boolean use_state,
            long state_timeout)
     throws Exception
```
    Throws:
    
    Exception
- Method Detail
  - getGroupName
```
public String getGroupName()
```
  - setGroupName
```
public void setGroupName(String groupname)
```
  - main
```
public static void main(String[] args)
```
  - go
```
public void go()
        throws Exception
```
    Throws:
    
    Exception
  - receive
```
public void receive(Message msg)
```
    Description copied from interface: MessageListener
    
    Called when a message is received.
    
    Specified by:
    
    receive in interface MessageListener
    
    Overrides:
    
    receive in class ExtendedReceiverAdapter
  - viewAccepted
```
public void viewAccepted(View v)
```
    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
    
    Overrides:
    
    viewAccepted in class ExtendedReceiverAdapter
  - 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
    
    Overrides:
    
    block in class ExtendedReceiverAdapter
  - unblock
```
public void unblock()
```
    Description copied from interface: ExtendedMembershipListener
    
    Called after the FLUSH protocol has unblocked previously blocked senders, and messages can be sent again. This callback only needs to be implemented if we require a notification of that.
    Note that during new view installation we provide guarantee that unblock invocation strictly follows view installation at some node A belonging to that view . However, some other message M may squeeze in between view and unblock callbacks. For more details see https://jira.jboss.org/jira/browse/JGRP-986
    
    Specified by:
    
    unblock in interface ExtendedMembershipListener
    
    Overrides:
    
    unblock in class ExtendedReceiverAdapter
  - getState
```
public byte[] getState()
```
    Description copied from interface: MessageListener
    
    Answers the group state; e.g., when joining.
    
    Specified by:
    
    getState in interface MessageListener
    
    Overrides:
    
    getState in class ExtendedReceiverAdapter
    
    Returns:
    
    byte[]
  - setState
```
public void setState(byte[] state)
```
    Description copied from interface: MessageListener
    
    Sets the group state; e.g., when joining.
    
    Specified by:
    
    setState in interface MessageListener
    
    Overrides:
    
    setState in class ExtendedReceiverAdapter
  - getState
```
public void getState(OutputStream ostream)
```
    Description copied from interface: ExtendedMessageListener
    
    Allows an application to write a state through a provided OutputStream. An application is obligated to always close the given OutputStream reference.
    
    Specified by:
    
    getState in interface ExtendedMessageListener
    
    Overrides:
    
    getState in class ExtendedReceiverAdapter
    
    Parameters:
    
    ostream - the OutputStream
    
    See Also:
    
    OutputStream.close()
  - setState
```
public void setState(InputStream istream)
```
    Description copied from interface: ExtendedMessageListener
    
    Allows an application to read a state through a provided InputStream. An application is obligated to always close the given InputStream reference.
    
    Specified by:
    
    setState in interface ExtendedMessageListener
    
    Overrides:
    
    setState in class ExtendedReceiverAdapter
    
    Parameters:
    
    istream - the InputStream
    
    See Also:
    
    InputStream.close()
  - clearPanel
```
public void clearPanel()
```
  - sendClearPanelMsg
```
public void sendClearPanelMsg()
```
  - actionPerformed
```
public void actionPerformed(ActionEvent e)
```
    Specified by:
    
    actionPerformed in interface ActionListener
  - stop
```
public void stop()
```
  - channelConnected
```
public void channelConnected(Channel channel)
```
    Specified by:
    
    channelConnected in interface ChannelListener
  - channelDisconnected
```
public void channelDisconnected(Channel channel)
```
    Specified by:
    
    channelDisconnected in interface ChannelListener
  - channelClosed
```
public void channelClosed(Channel channel)
```
    Specified by:
    
    channelClosed in interface ChannelListener
  - channelShunned
```
public void channelShunned()
```
    Specified by:
    
    channelShunned in interface ChannelListener
  - channelReconnected
```
public void channelReconnected(Address addr)
```
    Specified by:
    
    channelReconnected in interface ChannelListener

Class Draw

Constructor Summary

Method Summary

Methods inherited from class org.jgroups.ExtendedReceiverAdapter

Methods inherited from class java.lang.Object

Constructor Detail

Draw

Draw

Draw

Method Detail

getGroupName

setGroupName

main

go

receive

viewAccepted

block

unblock

getState

setState

getState

setState

clearPanel

sendClearPanelMsg

actionPerformed

stop

channelConnected

channelDisconnected

channelClosed

channelShunned

channelReconnected