private class JoinManager.DiscardProxyTask extends JoinManager.JoinTask
ServiceRegistration referenced by the given
ProxyReg object. The lease to be cancelled was granted
by the lookup service whose proxy is also referenced by the given
ProxyReg object. This task is executed whenever that
lookup service is discarded.
Note that although this task is executed upon receipt of any type
of lookup service discard event, there is one type of discard
that this task is actually intended to address: the so-called
"lost-interest" discard. A discard corresponding to a loss of
interest is an indication that the discarded lookup service is
still up and available, but the discovery manager employed by
this join manager (not the join manager or the service itself)
discards the lookup service because the service is no longer
interested in being registered with that lookup service. This
loss of interest is caused by a change in either the lookup
service's member groups or the service's groups-to-discover.
Such a change in groups would typically be made administratively,
through either the lookup service's administrative interface or
through the service's administrative interface (or both).
When the lookup service is discarded because of a loss of
interest, there is a time period in which the service is still
registered with the lookup service, even though the service no
longer wishes to be registered with that lookup service. To
address this, the lease is cancelled so that the service is
removed from the lookup service in a much more timely fashion
than simply allowing the lease to expire.
As stated above, this task is also executed upon receipt of
the other types of discard event. But because those other
discard types occur when the lookup service is no longer
available, the lease cancellation that is attempted here has
no significant effect.proxyReg| Constructor and Description |
|---|
DiscardProxyTask(JoinManager.ProxyReg proxyReg)
Constructor that provides this task with access (through the given
ProxyReg parameter) to the lease to be cancelled. |
| Modifier and Type | Method and Description |
|---|---|
void |
run()
Requests the cancellation of the lease on the
ServiceRegistration that is referenced in the
proxyReg data structure. |
DiscardProxyTask(JoinManager.ProxyReg proxyReg)
ProxyReg parameter) to the lease to be cancelled.proxyReg - data structure that references the
ServiceRegistration and associated
lease whose cancellation is to be requestedpublic void run()
ServiceRegistration that is referenced in the
proxyReg data structure.run in class JoinManager.JoinTaskCopyright 2007-2013, multiple authors.
Licensed under the Apache License, Version 2.0, see the NOTICE file for attributions.