org.apache.catalina.tribes.membership

Class McastService

java.lang.Object

org.apache.catalina.tribes.membership.MembershipServiceBase

org.apache.catalina.tribes.membership.McastService

All Implemented Interfaces:

McastServiceMBean, MembershipListener, MembershipService, MessageListener

public class McastService
extends MembershipServiceBase
implements MessageListener, McastServiceMBean

A membership implementation using simple multicast. This is the representation of a multicast membership service. This class is responsible for maintaining a list of active cluster nodes in the cluster. If a node fails to send out a heartbeat, the node will be dismissed.

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	domain
protected McastServiceImpl	impl A handle to the actual low level implementation
protected MemberImpl	localMember The local member
protected MessageListener	msglistener A message listener delegate for broadcasts
protected byte[]	payload
protected static StringManager	sm The string manager for this package.

Fields inherited from class org.apache.catalina.tribes.membership.MembershipServiceBase

channel, listener, properties

Fields inherited from interface org.apache.catalina.tribes.MembershipService

MBR_RX, MBR_TX

Constructor Summary

Constructors

Constructor and Description
McastService() Create a membership service.

Method Summary

Modifier and Type	Method and Description
boolean	accept(ChannelMessage msg)
void	broadcast(ChannelMessage message) Broadcasts a message to all members.
String	getAddress()
String	getBind()
byte[]	getDomain()
long	getDropTime()
long	getFrequency()
boolean	getLocalLoopbackDisabled()
Member	getLocalMember(boolean alive) Get the local member.
String	getLocalMemberName()
MembershipProvider	getMembershipProvider() Get the MembershipProvider
byte[]	getPayload()
int	getPort()
int	getRecoveryCounter()
boolean	getRecoveryEnabled()
long	getRecoverySleepTime()
int	getSoTimeout()
int	getTtl()
protected void	hasProperty(Properties properties, String name) Check if a required property is available.
static void	main(String[] args) Simple test program
void	messageReceived(ChannelMessage msg) Receive a message from the IO components in the Channel stack
void	removeMessageListener()
void	setAddress(String addr)
void	setBind(String bindaddr)
protected void	setDefaults(Properties properties)
void	setDomain(byte[] domain)
void	setDomain(String domain)
void	setDropTime(long time)
void	setFrequency(long time)
void	setLocalLoopbackDisabled(boolean localLoopbackDisabled)
void	setLocalMemberProperties(String listenHost, int listenPort, int securePort, int udpPort) Sets the local member properties for broadcasting.
void	setMcastBindAddress(String bindaddr)
void	setMcastDropTime(long time)
void	setMessageListener(MessageListener listener)
void	setPayload(byte[] payload) Set a payload to be broadcasted with each membership broadcast.
void	setPort(int port)
void	setProperties(Properties properties) Sets the properties for the membership service.
void	setRecoveryCounter(int recoveryCounter)
void	setRecoveryEnabled(boolean recoveryEnabled)
void	setRecoverySleepTime(long recoverySleepTime)
void	setSoTimeout(int mcastSoTimeout)
void	setTtl(int mcastTTL)
void	start(int level) Starts the membership service.
void	stop(int svc) Stop broadcasting and listening to membership pings

Methods inherited from class org.apache.catalina.tribes.membership.MembershipServiceBase

findMemberByName, getChannel, getMember, getMembers, getMembersByName, getProperties, hasMembers, memberAdded, memberDisappeared, removeMembershipListener, setChannel, setMembershipListener, start

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.catalina.tribes.membership.McastServiceMBean

findMemberByName, getMembersByName, getProperties, hasMembers

Field Detail

sm

protected static final StringManager sm

The string manager for this package.

impl

protected McastServiceImpl impl

A handle to the actual low level implementation

msglistener

protected MessageListener msglistener

A message listener delegate for broadcasts

localMember

protected MemberImpl localMember

The local member

payload

protected byte[] payload

domain

protected byte[] domain

Constructor Detail

McastService

public McastService()

Create a membership service.

Method Detail

setProperties

public void setProperties(Properties properties)

Sets the properties for the membership service.

Specified by:

setProperties in interface MembershipService

Overrides:

setProperties in class MembershipServiceBase

Parameters:

properties -
All are required
1. mcastPort - the port to listen to
2. mcastAddress - the mcast group address
4. bindAddress - the bind address if any - only one that can be null
5. memberDropTime - the time a member is gone before it is considered gone.
6. mcastFrequency - the frequency of sending messages
7. tcpListenPort - the port this member listens to
8. tcpListenHost - the bind address of this member

Throws:

IllegalArgumentException - if a property is missing.

getLocalMemberName

public String getLocalMemberName()

Specified by:

getLocalMemberName in interface McastServiceMBean

Returns:

the local member name

getLocalMember

public Member getLocalMember(boolean alive)

Get the local member.

Specified by:

getLocalMember in interface MembershipService

Parameters:

alive - true to set the alive time on the local member

Returns:

the member object that defines this member

setLocalMemberProperties

public void setLocalMemberProperties(String listenHost,
                                     int listenPort,
                                     int securePort,
                                     int udpPort)

Sets the local member properties for broadcasting.

Specified by:

setLocalMemberProperties in interface MembershipService

Parameters:

listenHost - Listen to host

listenPort - Listen to port

securePort - Use a secure port

udpPort - Use UDP

setAddress

public void setAddress(String addr)

getAddress

public String getAddress()

Specified by:

getAddress in interface McastServiceMBean

setMcastBindAddress

public void setMcastBindAddress(String bindaddr)

setBind

public void setBind(String bindaddr)

getBind

public String getBind()

Specified by:

getBind in interface McastServiceMBean

setPort

public void setPort(int port)

setRecoveryCounter

public void setRecoveryCounter(int recoveryCounter)

getRecoveryCounter

public int getRecoveryCounter()

Specified by:

getRecoveryCounter in interface McastServiceMBean

setRecoveryEnabled

public void setRecoveryEnabled(boolean recoveryEnabled)

getRecoveryEnabled

public boolean getRecoveryEnabled()

Specified by:

getRecoveryEnabled in interface McastServiceMBean

setRecoverySleepTime

public void setRecoverySleepTime(long recoverySleepTime)

getRecoverySleepTime

public long getRecoverySleepTime()

Specified by:

getRecoverySleepTime in interface McastServiceMBean

setLocalLoopbackDisabled

public void setLocalLoopbackDisabled(boolean localLoopbackDisabled)

getLocalLoopbackDisabled

public boolean getLocalLoopbackDisabled()

Specified by:

getLocalLoopbackDisabled in interface McastServiceMBean

getPort

public int getPort()

Specified by:

getPort in interface McastServiceMBean

setFrequency

public void setFrequency(long time)

getFrequency

public long getFrequency()

Specified by:

getFrequency in interface McastServiceMBean

setMcastDropTime

public void setMcastDropTime(long time)

setDropTime

public void setDropTime(long time)

getDropTime

public long getDropTime()

Specified by:

getDropTime in interface McastServiceMBean

hasProperty

protected void hasProperty(Properties properties,
                           String name)

Check if a required property is available.

Parameters:

properties - The set of properties

name - The property to check for

start

public void start(int level)
           throws Exception

Description copied from interface: MembershipService

Starts the membership service. If a membership listeners is added the listener will start to receive membership events.

Specified by:

start in interface MembershipService

Parameters:

level - - level MBR_RX starts listening for members, level MBR_TX starts broad casting the server

Throws:

Exception - if the service fails to start.

IllegalArgumentException - if the level is incorrect.

stop

public void stop(int svc)

Stop broadcasting and listening to membership pings

Specified by:

stop in interface MembershipService

Parameters:

svc - - level MBR_RX stops listening for members, level MBR_TX stops broad casting the server

setMessageListener

public void setMessageListener(MessageListener listener)

removeMessageListener

public void removeMessageListener()

messageReceived

public void messageReceived(ChannelMessage msg)

Description copied from interface: MessageListener

Receive a message from the IO components in the Channel stack

Specified by:

messageReceived in interface MessageListener

Parameters:

msg - ChannelMessage

accept

public boolean accept(ChannelMessage msg)

Specified by:

accept in interface MessageListener

broadcast

public void broadcast(ChannelMessage message)
               throws ChannelException

Description copied from interface: MembershipService

Broadcasts a message to all members.

Specified by:

broadcast in interface MembershipService

Overrides:

broadcast in class MembershipServiceBase

Parameters:

message - The message to broadcast

Throws:

ChannelException - Message broadcast failed

getSoTimeout

public int getSoTimeout()

Specified by:

getSoTimeout in interface McastServiceMBean

setSoTimeout

public void setSoTimeout(int mcastSoTimeout)

getTtl

public int getTtl()

Specified by:

getTtl in interface McastServiceMBean

getPayload

public byte[] getPayload()

getDomain

public byte[] getDomain()

Specified by:

getDomain in interface McastServiceMBean

setTtl

public void setTtl(int mcastTTL)

setPayload

public void setPayload(byte[] payload)

Description copied from interface: MembershipService

Set a payload to be broadcasted with each membership broadcast.

Specified by:

setPayload in interface MembershipService

Parameters:

payload - byte[]

setDomain

public void setDomain(byte[] domain)

Specified by:

setDomain in interface MembershipService

setDomain

public void setDomain(String domain)

getMembershipProvider

public MembershipProvider getMembershipProvider()

Description copied from interface: MembershipService

Get the MembershipProvider

Specified by:

getMembershipProvider in interface MembershipService

Returns:

MembershipProvider

setDefaults

protected void setDefaults(Properties properties)

main

public static void main(String[] args)
                 throws Exception

Simple test program

Parameters:

args - Command-line arguments

Throws:

Exception - If an error occurs