R: cache synchronization

From: Claudio Rosati (claudio.rosat..csys.it)
Date: Thu Dec 15 2005 - 08:58:08 EST

Next message: Andrus Adamchik: "M9 released"

Previous message: Andrea Borgogelli Avveduti: "Newbie: DataObject declaration and commit"
In reply to: Andrus Adamchik: "Re: cache synchronization"
Next in thread: Andrus Adamchik: "Re: cache synchronization"
Reply: Andrus Adamchik: "Re: cache synchronization"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hi Andrus.

Here what you asked (I've just made a remote modification first, followed by
a local one. Each modification called 5 times the shouldMergeChanges
method.):

---- SYSTEM.OUT ---------------------------------------------------------

...

Object snapshot version: -9223372036854774493
Row snapshot version: -- snapshotInStore is null --
Object snapshot version: -9223372036854774493
Row snapshot version: -- snapshotInStore is null --
Object snapshot version: -9223372036854774493
Row snapshot version: -- snapshotInStore is null --
Object snapshot version: -9223372036854774493
Row snapshot version: -- snapshotInStore is null --
Object snapshot version: -9223372036854774493
Row snapshot version: -- snapshotInStore is null --

---- SYSTEM.ERR ---------------------------------------------------------

java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1158)
        at
it.acsys.multimedia.products.cadmus.RecordDocument$1.shouldMergeChanges(Reco
rdDocument.java:124)
        at
org.objectstyle.cayenne.access.ObjectStore.processIndirectlyModifiedIDs(Obje
ctStore.java:1064)
        at
org.objectstyle.cayenne.access.ObjectStore.snapshotsChanged(ObjectStore.java
:876)
        at sun.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.objectstyle.cayenne.util.Invocation.fire(Invocation.java:226)
        at
org.objectstyle.cayenne.event.EventManager$InvocationDispatch.fire(EventMana
ger.java:429)
        at
org.objectstyle.cayenne.event.EventManager$DispatchThread.run(EventManager.j
ava:478)
java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1158)
        at
it.acsys.multimedia.products.cadmus.RecordDocument$1.shouldMergeChanges(Reco
rdDocument.java:124)
        at
org.objectstyle.cayenne.access.ObjectStore.processIndirectlyModifiedIDs(Obje
ctStore.java:1064)
        at
org.objectstyle.cayenne.access.ObjectStore.snapshotsChanged(ObjectStore.java
:876)
        at sun.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.objectstyle.cayenne.util.Invocation.fire(Invocation.java:226)
        at
org.objectstyle.cayenne.event.EventManager$InvocationDispatch.fire(EventMana
ger.java:429)
        at
org.objectstyle.cayenne.event.EventManager$DispatchThread.run(EventManager.j
ava:478)
java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1158)
        at
it.acsys.multimedia.products.cadmus.RecordDocument$1.shouldMergeChanges(Reco
rdDocument.java:124)
        at
org.objectstyle.cayenne.access.ObjectStore.processIndirectlyModifiedIDs(Obje
ctStore.java:1064)
        at
org.objectstyle.cayenne.access.ObjectStore.snapshotsChanged(ObjectStore.java
:876)
        at sun.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.objectstyle.cayenne.util.Invocation.fire(Invocation.java:226)
        at
org.objectstyle.cayenne.event.EventManager$InvocationDispatch.fire(EventMana
ger.java:429)
        at
org.objectstyle.cayenne.event.EventManager$DispatchThread.run(EventManager.j
ava:478)
java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1158)
        at
it.acsys.multimedia.products.cadmus.RecordDocument$1.shouldMergeChanges(Reco
rdDocument.java:124)
        at
org.objectstyle.cayenne.access.ObjectStore.processIndirectlyModifiedIDs(Obje
ctStore.java:1064)
        at
org.objectstyle.cayenne.access.ObjectStore.snapshotsChanged(ObjectStore.java
:876)
        at sun.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.objectstyle.cayenne.util.Invocation.fire(Invocation.java:226)
        at
org.objectstyle.cayenne.event.EventManager$InvocationDispatch.fire(EventMana
ger.java:429)
        at
org.objectstyle.cayenne.event.EventManager$DispatchThread.run(EventManager.j
ava:478)
java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1158)
        at
it.acsys.multimedia.products.cadmus.RecordDocument$1.shouldMergeChanges(Reco
rdDocument.java:124)
        at
org.objectstyle.cayenne.access.ObjectStore.processIndirectlyModifiedIDs(Obje
ctStore.java:1064)
        at
org.objectstyle.cayenne.access.ObjectStore.snapshotsChanged(ObjectStore.java
:876)
        at sun.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.objectstyle.cayenne.util.Invocation.fire(Invocation.java:226)
        at
org.objectstyle.cayenne.event.EventManager$InvocationDispatch.fire(EventMana
ger.java:429)
        at
org.objectstyle.cayenne.event.EventManager$DispatchThread.run(EventManager.j
ava:478)

-------------------------------------------------------------------------

Moreover, after some problems having JGroups working, I managed it using
address 228.8.8.8 and port 45566.
I hope this can help.

Claudio

------------------------------------
Advanced Computer Systems S.p.A.
Claudio Rosati
Project Manager
claudio.rosat..csys.it
via Della Bufalotta 378
00139 Roma, RM
Italy
tel: +39 06 8709 0516
fax: +39 06 8720 1502
------------------------------------

> -----Messaggio originale-----
> Da: Andrus Adamchik [mailto:andru..bjectstyle.org]
> Inviato: gioved� 15 dicembre 2005 10.04
> A: cayenne-use..bjectstyle.org
> Oggetto: Re: cache synchronization
>
> Hi Claudio,
>
> Looking at the code the only case I can see when a local
> operation would trigger "finishedMergeChanges" call (inside
> ObjectStore.retainSnapshot(..)) is when a snapshot for a
> given object was refreshed in the underlying cache. I am
> still unclear why this happens in your case, and I suspect a
> bug in snapshot version handling.
>
> Can you possibly do a simple test, adding some debug info to
> the delegate and try it first with remote modification, and
> then with a local one, and see what is printed to the console:
>
> public boolean shouldMergeChanges ( DataObject object,
> DataRow snapshotInStore ) {
> System.out.println("Object snapshot version: " +
> object.getSnapshotVersion());
> System.out.println("Row snapshot version: " +
> snapshotInStore.getVersion());
>
> Thread.dumpStack();
>
> return true;
> }
>
> Andrus
>
>
> On Dec 14, 2005, at 2:45 PM, Claudio Rosati wrote:
> > HI all,
> >
> > I'm using Cayenne (1.1.3) with jGroups. This is the code
> I'm using to
> > inform my user (a flashing message in the application's
> status bar) of
> > a modification occurred:
> >
> > dataContext.setDelegate(
> > new DataContextDelegate() {
> > public void finishedMergeChanges ( DataObject object ) {
> > ... // Show a flashing message in the status bar.
> > }
> > public void finishedProcessDelete ( DataObject object ) {
> > ; // Nothing to do.
> > }
> > public boolean shouldMergeChanges ( DataObject object, DataRow
> > snapshotInStore ) {
> > return true;
> > }
> > public boolean shouldProcessDelete ( DataObject object ) {
> > return true;
> > }
> > public GenericSelectQuery willPerformSelect (
> DataContext context,
> > GenericSelectQuery query ) {
> > return query;
> > }
> > }
> > );
> >
> > The problem is that finishedMergeChanges is called not only when
> > someone in the net changes the object viewed by my user,
> but even when
> > my user does some modification on the object graph.
> >
> > There is a way to understand if the call was made locally
> (in the same
> > V.M.
> > where the application is running) or elsewhere (i.e. was caused by
> > cache synchronization triggered by jgroups).?
> >
> > Thanks in advance
> >
> > Claudio
> >
> > ------------------------------------
> > Advanced Computer Systems S.p.A.
> > Claudio Rosati
> > Project Manager
> > claudio.rosat..csys.it
> > via Della Bufalotta 378
> > 00139 Roma, RM
> > Italy
> > tel: +39 06 8709 0516
> > fax: +39 06 8720 1502
> > ------------------------------------
>

Next message: Andrus Adamchik: "M9 released"
Previous message: Andrea Borgogelli Avveduti: "Newbie: DataObject declaration and commit"
In reply to: Andrus Adamchik: "Re: cache synchronization"
Next in thread: Andrus Adamchik: "Re: cache synchronization"
Reply: Andrus Adamchik: "Re: cache synchronization"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2.0.0 : Thu Dec 15 2005 - 08:58:08 EST