to the hashtable (peer address is the key). All
messages sent to that peer will be added to hashtable.peer_addr.sent_msgs. When we receive a
message from a peer for the first time, another entry will be created and added to the hashtable
(unless already existing). Msgs will then be added to hashtable.peer_addr.received_msgs. This
layer is used to reliably transmit point-to-point messages, that is, either messages sent to a
single receiver (vs. messages multicast to a group) or for example replies to a multicast message. The
sender uses an AckSenderWindow which retransmits messages for which it hasn't received
an ACK, the receiver uses AckReceiverWindow which keeps track of the lowest seqno
received so far, and keeps messages in order.
Messages in both AckSenderWindows and AckReceiverWindows will be removed. A message will be removed from
AckSenderWindow when an ACK has been received for it and messages will be removed from AckReceiverWindow
whenever a message is received: the new message is added and then we try to remove as many messages as
possible (until we stop at a gap, or there are no more messages).
| Fields inherited from class org.jgroups.stack.Protocol |
down_handler, down_prot, down_queue, down_thread, down_thread_prio, log, observer, props, stack, stats, trace, up_handler, up_prot, up_queue, up_thread, up_thread_prio, warn |
| Methods inherited from class org.jgroups.stack.Protocol |
destroy, downThreadEnabled, enableStats, getDownProtocol, getDownQueue, getProperties, getUpProtocol, getUpQueue, handleSpecialDownEvent, init, isTrace, isWarn, passDown, passUp, printStats, providedDownServices, providedUpServices, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, setDownProtocol, setObserver, setPropertiesInternal, setProtocolStack, setTrace, setUpProtocol, setWarn, startDownHandler, startUpHandler, statsEnabled, stopInternal, upThreadEnabled |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
members
private final java.util.Vector members
connections
private final java.util.HashMap connections
timeout
private long[] timeout
local_addr
private org.jgroups.Address local_addr
timer
private org.jgroups.util.TimeScheduler timer
use_gms
private boolean use_gms
previous_members
private final org.jgroups.util.BoundedList previous_members
- A list of members who left, used to determine when to prevent sending messages to left mbrs
name
private static final java.lang.String name
- See Also:
- Constant Field Values
DEFAULT_FIRST_SEQNO
private static final long DEFAULT_FIRST_SEQNO
- See Also:
- Constant Field Values
num_msgs_sent
private long num_msgs_sent
num_msgs_received
private long num_msgs_received
num_bytes_sent
private long num_bytes_sent
num_bytes_received
private long num_bytes_received
num_acks_sent
private long num_acks_sent
num_acks_received
private long num_acks_received
num_xmit_requests_received
private long num_xmit_requests_received
UNICAST
public UNICAST()
getName
public java.lang.String getName()
- All protocol names have to be unique !
getLocalAddress
public java.lang.String getLocalAddress()
getMembers
public java.lang.String getMembers()
printConnections
public java.lang.String printConnections()
getNumMessagesSent
public long getNumMessagesSent()
getNumMessagesReceived
public long getNumMessagesReceived()
getNumBytesSent
public long getNumBytesSent()
getNumBytesReceived
public long getNumBytesReceived()
getNumAcksSent
public long getNumAcksSent()
getNumAcksReceived
public long getNumAcksReceived()
getNumberOfRetransmitRequestsReceived
public long getNumberOfRetransmitRequestsReceived()
getNumberOfUnackedMessages
public int getNumberOfUnackedMessages()
- The number of messages in all Entry.sent_msgs tables (haven't received an ACK yet)
resetStats
public void resetStats()
dumpStats
public java.util.Map dumpStats()
setProperties
public boolean setProperties(java.util.Properties props)
- Description copied from class:
org.jgroups.stack.Protocol
- Configures the protocol initially. A configuration string consists of name=value
items, separated by a ';' (semicolon), e.g.:
"loopback=false;unicast_inport=4444"
start
public void start()
throws java.lang.Exception
- Description copied from class:
org.jgroups.stack.Protocol
- This method is called on a Channel.connect(String)>
Channel.connect(String) 55 . 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.
stop
public void stop()
- Description copied from class:
org.jgroups.stack.Protocol
- This method is called on a Channel.disconnect()>
Channel.disconnect() 55 . 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
up
public void up(org.jgroups.Event evt)
- Description copied from class:
org.jgroups.stack.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 using
passDown() or c) the event (or another event) is sent up
the stack using passUp().
down
public void down(org.jgroups.Event evt)
- Description copied from class:
org.jgroups.stack.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 using
passDown(). 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 using passUp().
removeConnection
private boolean removeConnection(java.lang.Object mbr)
- Removes and resets from connection table (which is already locked). Returns true if member was found, otherwise false
removeAllConnections
private void removeAllConnections()
retransmit
public void retransmit(long seqno,
org.jgroups.Message msg)
- Called by AckSenderWindow to resend messages for which no ACK has been received yet
- Specified by:
retransmit in interface org.jgroups.stack.AckSenderWindow.RetransmitCommand
handleDataReceived
private void handleDataReceived(java.lang.Object sender,
long seqno,
org.jgroups.Message msg)
- Check whether the hashtable contains an entry e for
sender (create if not). If
e.received_msgs is null and first is true: create a new AckReceiverWindow(seqno) and
add message. Set e.received_msgs to the new window. Else just add the message.
handleAckReceived
private void handleAckReceived(java.lang.Object sender,
long seqno)
- Add the ACK to hashtable.sender.sent_msgs
sendAck
private void sendAck(org.jgroups.Address dst,
long seqno)
JAVADOC | 
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