Package org.jgroups.demos
Class QuoteServer
- java.lang.Object
-
- org.jgroups.demos.QuoteServer
-
- All Implemented Interfaces:
MembershipListener
,MessageListener
public class QuoteServer extends java.lang.Object implements MembershipListener, MessageListener
Example of a replicated quote server. The server maintains state which consists of a list of quotes and their corresponding values. When it is started, it tries to reach other quote servers to get its initial state. If it does not receive any response after 5 seconds, it assumes it is the first server and starts processing requests.Any updates are multicast across the cluster
- Author:
- Bela Ban
-
-
Constructor Summary
Constructors Constructor Description QuoteServer()
-
Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
block()
Called (usually by the FLUSH protocol), as an indication that the member should stop sending messages.java.util.Hashtable
getAllStocks()
float
getQuote(java.lang.String stock_name)
byte[]
getState()
Answers the group state; e.g., when joining.static void
main(java.lang.String[] args)
void
printAllStocks()
void
receive(Message msg)
Called when a message is received.void
setQuote(java.lang.String stock_name, java.lang.Float value)
void
setState(byte[] state)
Sets the group state; e.g., when joining.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 new_view)
Called when a change in membership has occurred.
-
-
-
Method Detail
-
viewAccepted
public void viewAccepted(View new_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 whenChannel.connect(String)
returns.- Specified by:
viewAccepted
in interfaceMembershipListener
-
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 interfaceMembershipListener
-
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, implementExtendedMembershipListener.unblock()
. Note that block() is the equivalent of reception of a BlockEvent in the pull mode.- Specified by:
block
in interfaceMembershipListener
-
start
public void start()
-
getQuote
public float getQuote(java.lang.String stock_name) throws java.lang.Exception
- Throws:
java.lang.Exception
-
setQuote
public void setQuote(java.lang.String stock_name, java.lang.Float value)
-
getAllStocks
public java.util.Hashtable getAllStocks()
-
printAllStocks
public void printAllStocks()
-
receive
public void receive(Message msg)
Description copied from interface:MessageListener
Called when a message is received.- Specified by:
receive
in interfaceMessageListener
-
getState
public byte[] getState()
Description copied from interface:MessageListener
Answers the group state; e.g., when joining.- Specified by:
getState
in interfaceMessageListener
- 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 interfaceMessageListener
-
main
public static void main(java.lang.String[] args)
-
-