org.apache.river.outrigger

Class StorableEventWatcher

java.lang.Object

org.apache.river.outrigger.TransitionWatcher

org.apache.river.outrigger.EventRegistrationWatcher

org.apache.river.outrigger.StorableEventWatcher

All Implemented Interfaces:

Comparable<TransitionWatcher>, LeasedResource, EventRegistrationRecord, StorableObject<StorableEventWatcher>, StorableResource<StorableEventWatcher>

class StorableEventWatcher
extends EventRegistrationWatcher
implements StorableResource<StorableEventWatcher>

Subclass of EventRegistrationWatcher for non-transactional persistent event registrations.

Field Summary

Fields

Modifier and Type	Field and Description
private StorableReference	listener The listener that should be notified of matches

Fields inherited from class org.apache.river.outrigger.EventRegistrationWatcher

cookie, eventID, expiration, handback

Fields inherited from class org.apache.river.outrigger.TransitionWatcher

startOrdinal

Constructor Summary

Constructors

Constructor and Description
StorableEventWatcher(long timestamp, long startOrdinal, long currentSeqNum) Used during log recovery to create a mostly empty StorableEventWatcher.
StorableEventWatcher(long timestamp, long startOrdinal, Uuid cookie, MarshalledObject handback, long eventID, RemoteEventListener listener) Create a new StorableEventWatcher.

Method Summary

Modifier and Type	Method and Description
(package private) void	cleanup(TemplateHandle owner, boolean expired) Overridden by subclasses if there is any cleanup work they need to do as part of cancel or removeIfExpired.
(package private) RemoteEventListener	getListener(ProxyPreparer preparer) Return the remote listener associated with this EventRegistrationWatcher.
(package private) boolean	isInterested(EntryTransition transition, long ordinal) Return true if this watcher cares about a given visibility transition.
StorableEventWatcher	restore(ObjectInputStream in) Restore the persistent fields
void	store(ObjectOutputStream out) Store the persistent fields

Methods inherited from class org.apache.river.outrigger.EventRegistrationWatcher

addTemplateHandle, cancel, getCookie, getExpiration, process, removeIfExpired, setExpiration

Methods inherited from class org.apache.river.outrigger.TransitionWatcher

compareTo

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.river.landlord.LeasedResource

getCookie, getExpiration, setExpiration

Field Detail

listener

private volatile StorableReference listener

The listener that should be notified of matches

Constructor Detail

StorableEventWatcher

StorableEventWatcher(long timestamp,
                     long startOrdinal,
                     long currentSeqNum)

Used during log recovery to create a mostly empty StorableEventWatcher.

Note, we set the time stamp and tie-breaker here instead of getting them from the log. This means they will be inconstant with their value from the last VM we were in, but since they never leak out and events are read-only anyway this should not be a problem (this also allows us to keep the tie-breaker and time stamp in final fields).

Parameters:

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.

currentSeqNum - Sequence number to start with.

Throws:

NullPointerException - if the notifier argument is null.

StorableEventWatcher

StorableEventWatcher(long timestamp,
                     long startOrdinal,
                     Uuid cookie,
                     MarshalledObject handback,
                     long eventID,
                     RemoteEventListener listener)

Create a new StorableEventWatcher.

Parameters:

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.

cookie - The unique identifier associated with this watcher. Must not be null.

handback - The handback object that should be sent along with event notifications to the the listener.

eventID - The event ID for event type represented by this object.

listener - The object to notify of matches.

Throws:

NullPointerException - if the cookie, or listener arguments are null.

Method Detail

isInterested

boolean isInterested(EntryTransition transition,
                     long ordinal)

Description copied from class: TransitionWatcher

Return true 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.

Specified by:

isInterested in class TransitionWatcher

Parameters:

transition - 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.

Returns:

true if this watcher is interested in the indicated transition and false otherwise.

getListener

RemoteEventListener getListener(ProxyPreparer preparer)
                         throws ClassNotFoundException,
                                IOException

Description copied from class: EventRegistrationWatcher

Return the remote listener associated with this EventRegistrationWatcher. Optionally prepare the listener if it has been recovered from the store and not yet re-prepared.

Specified by:

getListener in class EventRegistrationWatcher

Returns:

the remote listener associated with this EventRegistrationWatcher.

Throws:

ClassNotFoundException - if the listener needs to be unmarshalled and a necessary class can not be found.

IOException - if the listener can not be unmarshalled. May throw RemoteException if the call to the preparer does

cleanup

void cleanup(TemplateHandle owner,
             boolean expired)

Overridden by subclasses if there is any cleanup work they need to do as part of cancel or removeIfExpired. Called after releasing the lock on this. Will be called at most once.

Overrides:

cleanup in class EventRegistrationWatcher

Parameters:

owner - A reference to the owner.

expired - true if being called from removeIfExpired and false otherwise.

store

public void store(ObjectOutputStream out)
           throws IOException

Store the persistent fields

Specified by:

store in interface StorableObject<StorableEventWatcher>

Throws:

IOException

restore

public StorableEventWatcher restore(ObjectInputStream in)
                             throws IOException,
                                    ClassNotFoundException

Restore the persistent fields

Specified by:

restore in interface StorableObject<StorableEventWatcher>

Returns:

new object instance.

Throws:

IOException

ClassNotFoundException