class ReadWatcher extends SingletonQueryWatcher
QueryWatcher for non-transactional reads.
Resolves with the first matching transition where the transaction
is null and the entry is visible (the entry's current
state is ignored).startOrdinal| Constructor and Description |
|---|
ReadWatcher(long expiration,
long timestamp,
long startOrdinal)
Create a new
ReadWatcher. |
| Modifier and Type | Method and Description |
|---|---|
(package private) boolean |
catchUp(EntryTransition transition,
long now)
Process a transition which was posted before the watcher was
placed in
TransitionWatchers object. |
(package private) boolean |
isInterested(EntryTransition transition,
long ordinal)
Return
true if this watcher cares about a given
visibility transition. |
(package private) void |
process(EntryTransition transition,
long now)
Process the given transition.
|
addTemplateHandle, getServer, isResolved, resolve, resolvedWithEntry, resolvedWithThrowable, waitOnResolutiongetExpiration, removeIfExpiredcompareToReadWatcher(long expiration,
long timestamp,
long startOrdinal)
ReadWatcher.expiration - the initial expiration time
for this TransitionWatcher in
milliseconds since the beginning of the epoch.timestamp - the value that is used
to sort TransitionWatchers.startOrdinal - the highest ordinal associated
with operations that are considered to have occurred
before the operation associated with this watcher.boolean isInterested(EntryTransition transition, long ordinal)
TransitionWatchertrue if this watcher cares about a given
visibility transition. Assumes the transitioning entry matches
the template in the TemplateHandle associated with
this watcher. This method should return a value even if the
expiration time has been reached or remove has
been called. This call should not obtain any locks.isInterested in class TransitionWatchertransition - A EntryTransition that
describes the transition and what
entry is transitioning. This method
will assume that transition.getHandle
returns a non-null value.ordinal - The ordinal associated with transition.true if this watcher is interested
in the indicated transition and false
otherwise.void process(EntryTransition transition, long now)
TransitionWatcherTemplateHandle associated with this
watcher and that isInterested returned
true. This call may make changes to the passed
EntryHandle that will prevent it from being used by
other watchers. If remove has been called or the
expiration time of this watcher has passed, this call should have no
effect. This call may cause the watcher to be removed.process in class TransitionWatchertransition - A EntryTransition that
describes the transition and what
entry is transitioning. This method
will assume that transition.getHandle
returns a non-null value.now - An estimate of the current time (not the time
when the event occured).boolean catchUp(EntryTransition transition, long now)
QueryWatcherTransitionWatchers object. Assumes that
the entry in the transition matches matches the template in the
TemplateHandle associated with this watcher. Does
not assume isInterested has been called.catchUp in class QueryWatchertransition - A EntryTransition that
describes the transition and what
entry is transitioning. This method
will assume that transition.getHandle
returns a non-null value.now - An estimate of the current time (not the time
when the event occured).true if the query has been resolved, and
false otherwise. Note, even if this
call returns true, waitOnResolution
must still be called.Copyright 2007-2013, multiple authors.
Licensed under the Apache License, Version 2.0, see the NOTICE file for attributions.