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Date: Thu, 26 Oct 2006 09:31:39 +0200
From: "=?UTF-8?Q?Borut_Bol=C4=8Dina?=" <borut.bolcina@gmail.com>
To: cayenne-user@incubator.apache.org
Subject: Re: Shared cache
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I am interested in this also.

2006/10/18, Marko <mpistotnik@gmail.com>:
>
> Hi, list!
>
> I have a problem setting up a shared cache between two JVMs. The changes
> in the JVM A don't all get propagated to JVM B. Here's the code:
>
> JVM A:
>
>         // The following doesn't trigger the remote snapshot event...
>         DataContext context = DataContext.createDataContext();
>         Dbe001 e001 = (Dbe001)context.createAndRegisterNewObject(
> Dbe001.class);
>         e001.setA002(777);
>         context.commitChanges();
>
>         // While this does...
>         SelectQuery query = new SelectQuery(Dbe001.class);
>         List<Dbe001> artists = context.performQuery(query);
>         artists.get(0).setA002(237846);
>         context.commitChanges();
>
> JVM B:
>
>             SnapshotEventListener customListener = new
> DCSnapshotEventListener();
>
>             DataDomain domain = Configuration.getSharedConfiguration()
>                     .getDomain();
>
>             domain.getEventManager().addListener(customListener,
>                     "snapshotsChanged", SnapshotEvent.class,
>                     domain.getSharedSnapshotCache
> ().getSnapshotEventSubject(),
>                     domain.getSharedSnapshotCache());
>
>             System.in.read();
>
>
> class DCSnapshotEventListener
>         implements SnapshotEventListener
> {
>     public void snapshotsChanged(SnapshotEvent event)
>     {
>         Map<ObjectId, DataRow> diff = event.getModifiedDiffs();
>         System.err.println(diff);
>     }
> }
>
>
> The data object looks like this:
>
> public class _Dbe001 extends org.apache.cayenne.CayenneDataObject {
>
>     public static final String A002_PROPERTY = "a002";
>
>     public static final String A001_PK_COLUMN = "a001";
>
>     public void setA002(Integer a002) {
>         writeProperty("a002", a002);
>     }
>     public Integer getA002() {
>         return (Integer)readProperty("a002");
>     }
>
>
> }
>
>
> And the database entity is as follows:
>
> <data-map project-version="2.0">
>         <db-entity name="dbe001">
>                 <db-attribute name="a001" type="INTEGER"
> isPrimaryKey="true"
> isMandatory="true"/>
>                 <db-attribute name="a002" type="INTEGER"/>
>         </db-entity>
>         <obj-entity name="Dbe001" className="Dbe001"
> dbEntityName="dbe001">
>                 <obj-attribute name="a002" type="java.lang.Integer"
> db-attribute-path="a002"/>
>         </obj-entity>
> </data-map>
>
>
> The transport layer is JGroups with default settings. Any ideas?
>
>

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