Package org.jgroups.protocols
Class VIEW_SYNC
- java.lang.Object
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- org.jgroups.stack.Protocol
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- org.jgroups.protocols.VIEW_SYNC
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public class VIEW_SYNC extends Protocol
Periodically sends the view to the group. When a view is received which is greater than the current view, we install it. Otherwise we simply discard it. This is used to solve the problem for unreliable view dissemination outlined in JGroups/doc/ReliableViewInstallation.txt. This protocol is supposed to be just below GMS.- Version:
- $Id: VIEW_SYNC.java,v 1.24.2.2 2008/05/22 13:23:06 belaban Exp $
- Author:
- Bela Ban
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
VIEW_SYNC.ViewSyncHeader
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Constructor Summary
Constructors Constructor Description VIEW_SYNC()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
down(Event evt)
An event is to be sent down the stack.long
getAverageSendInterval()
long
getLastViewRequestSent()
java.lang.String
getName()
int
getNumViewRequestsSent()
int
getNumViewResponsesSeen()
int
getNumViewsAdjusted()
int
getNumViewsEqual()
int
getNumViewsLess()
int
getNumViewsNonLocal()
int
getNumViewsSent()
void
resetStats()
void
sendViewRequest()
Sends a VIEW_SYNC_REQ to all members, every member replies with a VIEW multicastvoid
setAverageSendInterval(long gossip_interval)
boolean
setProperties(java.util.Properties props)
Configures the protocol initially.void
start()
This method is called on aChannel.connect(String)
.void
stop()
This method is called on aChannel.disconnect()
.java.lang.Object
up(Event evt)
An event was received from the layer below.-
Methods inherited from class org.jgroups.stack.Protocol
destroy, downThreadEnabled, dumpStats, enableStats, getDownProtocol, getProperties, getProtocolStack, getThreadFactory, getTransport, getUpProtocol, init, printStats, providedDownServices, providedUpServices, requiredDownServices, requiredUpServices, setDownProtocol, setPropertiesInternal, setProtocolStack, setUpProtocol, statsEnabled, upThreadEnabled
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Method Detail
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getAverageSendInterval
public long getAverageSendInterval()
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setAverageSendInterval
public void setAverageSendInterval(long gossip_interval)
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getNumViewsSent
public int getNumViewsSent()
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getNumViewRequestsSent
public int getNumViewRequestsSent()
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getNumViewResponsesSeen
public int getNumViewResponsesSeen()
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getNumViewsNonLocal
public int getNumViewsNonLocal()
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getNumViewsLess
public int getNumViewsLess()
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getNumViewsEqual
public int getNumViewsEqual()
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getLastViewRequestSent
public long getLastViewRequestSent()
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getNumViewsAdjusted
public int getNumViewsAdjusted()
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resetStats
public void resetStats()
- Overrides:
resetStats
in classProtocol
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setProperties
public boolean setProperties(java.util.Properties props)
Description copied from class:Protocol
Configures the protocol initially. A configuration string consists of name=value items, separated by a ';' (semicolon), e.g.:"loopback=false;unicast_inport=4444"
- Overrides:
setProperties
in classProtocol
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start
public void start() throws java.lang.Exception
Description copied from class:Protocol
This method is called on aChannel.connect(String)
. Starts work. Protocols are connected and queues are ready to receive events. Will be called from bottom to top. This call will replace the START and START_OK events.- Overrides:
start
in classProtocol
- Throws:
java.lang.Exception
- Thrown if protocol cannot be started successfully. This will cause the ProtocolStack to fail, soChannel.connect(String)
will throw an exception
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stop
public void stop()
Description copied from class:Protocol
This method is called on aChannel.disconnect()
. Stops work (e.g. by closing multicast socket). Will be called from top to bottom. This means that at the time of the method invocation the neighbor protocol below is still working. This method will replace the STOP, STOP_OK, CLEANUP and CLEANUP_OK events. The ProtocolStack guarantees that when this method is called all messages in the down queue will have been flushed
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sendViewRequest
public void sendViewRequest()
Sends a VIEW_SYNC_REQ to all members, every member replies with a VIEW multicast
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up
public java.lang.Object up(Event evt)
Description copied from class:Protocol
An event was received from the layer below. Usually the current layer will want to examine the event type and - depending on its type - perform some computation (e.g. removing headers from a MSG event type, or updating the internal membership list when receiving a VIEW_CHANGE event). Finally the event is either a) discarded, or b) an event is sent down the stack usingdown_prot.down()
or c) the event (or another event) is sent up the stack usingup_prot.up()
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down
public java.lang.Object down(Event evt)
Description copied from class:Protocol
An event is to be sent down the stack. The layer may want to examine its type and perform some action on it, depending on the event's type. If the event is a message MSG, then the layer may need to add a header to it (or do nothing at all) before sending it down the stack usingdown_prot.down()
. In case of a GET_ADDRESS event (which tries to retrieve the stack's address from one of the bottom layers), the layer may need to send a new response event back up the stack usingup_prot.up()
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