Package org.jgroups.protocols
Class MPING
- java.lang.Object
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- org.jgroups.stack.Protocol
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- org.jgroups.protocols.Discovery
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- org.jgroups.protocols.PING
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- org.jgroups.protocols.MPING
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- All Implemented Interfaces:
java.lang.Runnable
public class MPING extends PING implements java.lang.Runnable
Uses its own IP multicast socket to send and receive discovery requests/responses. Can be used in conjuntion with a non-UDP transport, e.g. TCP.The discovery is assymetric: discovery requests are broadcast via the multicast socket, and received via the multicast socket by everyone in the group. However, the discovery responses are sent back via the regular transport (e.g. TCP) to the sender (discovery request contained sender's regular address, e.g. 192.168.0.2:7800).
- Version:
- $Id: MPING.java,v 1.29.2.7 2009/02/05 08:17:36 belaban Exp $
- Author:
- Bela Ban
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Constructor Summary
Constructors Constructor Description MPING()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.net.InetAddress
getBindAddr()
java.net.InetAddress
getMcastAddr()
int
getMcastPort()
java.lang.String
getName()
java.util.List<java.net.NetworkInterface>
getReceiveInterfaces()
java.util.List<java.net.NetworkInterface>
getSendInterfaces()
int
getTTL()
boolean
isReceiveOnAllInterfaces()
boolean
isSendOnAllInterfaces()
void
run()
void
setBindAddr(java.net.InetAddress bind_addr)
void
setMcastAddr(java.net.InetAddress mcast_addr)
void
setMcastPort(int mcast_port)
boolean
setProperties(java.util.Properties props)
sets the properties of the PING protocol.void
setTTL(int ip_ttl)
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.protocols.PING
getGossipPort, getGossipRefresh, handleConnect, handleDisconnect, init, localAddressSet, sendGetMembersRequest, setGossipPort, setGossipRefresh, waitForDiscoveryRequestReception
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Methods inherited from class org.jgroups.protocols.Discovery
down, findInitialMembers, findInitialMembersAsString, getNumberOfDiscoveryRequestsSent, getNumInitialMembers, getNumPingRequests, getTimeout, makeView, providedUpServices, resetStats, setNumInitialMembers, setNumPingRequests, setTimeout
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Methods inherited from class org.jgroups.stack.Protocol
destroy, downThreadEnabled, dumpStats, enableStats, getDownProtocol, getProperties, getProtocolStack, getThreadFactory, getTransport, getUpProtocol, printStats, providedDownServices, requiredDownServices, requiredUpServices, setDownProtocol, setPropertiesInternal, setProtocolStack, setUpProtocol, statsEnabled, upThreadEnabled
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Method Detail
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getBindAddr
public java.net.InetAddress getBindAddr()
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setBindAddr
public void setBindAddr(java.net.InetAddress bind_addr)
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getReceiveInterfaces
public java.util.List<java.net.NetworkInterface> getReceiveInterfaces()
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getSendInterfaces
public java.util.List<java.net.NetworkInterface> getSendInterfaces()
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isReceiveOnAllInterfaces
public boolean isReceiveOnAllInterfaces()
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isSendOnAllInterfaces
public boolean isSendOnAllInterfaces()
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getTTL
public int getTTL()
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setTTL
public void setTTL(int ip_ttl)
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getMcastAddr
public java.net.InetAddress getMcastAddr()
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setMcastAddr
public void setMcastAddr(java.net.InetAddress mcast_addr)
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getMcastPort
public int getMcastPort()
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setMcastPort
public void setMcastPort(int mcast_port)
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setProperties
public boolean setProperties(java.util.Properties props)
Description copied from class:PING
sets the properties of the PING protocol. The following properties are available property: timeout - the timeout (ms) to wait for the initial members, default is 3000=3 secs property: num_initial_members - the minimum number of initial members for a FIND_INITAL_MBRS, default is 2 property: gossip_host - if you are using GOSSIP then this defines the host of the GossipRouter, default is null property: gossip_port - if you are using GOSSIP then this defines the port of the GossipRouter, default is null- Overrides:
setProperties
in classPING
- Parameters:
props
- - a property set containing only PING properties- Returns:
- returns true if all properties were parsed properly returns false if there are unrecnogized properties in the property set
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up
public java.lang.Object up(Event evt)
Description copied from class:Discovery
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 usingPassDown
or c) the event (or another event) is sent up the stack usingPassUp
. For the PING protocol, the Up operation does the following things. 1. If the event is a Event.MSG then PING will inspect the message header. If the header is null, PING simply passes up the event If the header is PingHeader.GET_MBRS_REQ then the PING protocol will PassDown a PingRequest message If the header is PingHeader.GET_MBRS_RSP we will add the message to the initial members vector and wake up any waiting threads. 2. If the event is Event.SET_LOCAL_ADDR we will simple set the local address of this protocol 3. For all other messages we simple pass it up to the protocol above
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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 classDiscovery
- 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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run
public void run()
- Specified by:
run
in interfacejava.lang.Runnable
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