hibernate-devel — development

Re: [Hibernate-devel] Cache questions....

[Gavin_King/Cirrus%<CI...@ci...>]

>Forum1 get cached then accessed multiple times from the cache, while being
>accessed, getThreads() method is used.
>
>At the end, we got a graph of objects and since the cache share the same
>reference to the Forum1, it will cache this graph of object, this could
lead
>to caching the whole DB over the time...

This doesn't occur because objects are cached in a "disassmebled" form and
anyway the cache has an expiry algorithm.

If you configure caching for Forums but not for Threads in the mapping
file, forum data will be cached, but never Thread data.

>In a multi threaded environement, multiple threads could get a copy from
>the cache of the Forum1 object, how to deal with the concurrency access of
>non-synchronized collections ?

We never retrieve the *actual* cached data, only a clone of it. ie, pulling
data out of the cache involves assembling a new object from the
disassembled state.

Hope that all makes sense. If it doesn't, go check the code in

  cirrus.hibernate.impl.ClassPersister

that should answer your problems....

peace

Gavin

[Hibernate-devel] Cache questions....

[Christian M. <vc...@cl...>]

I am thinking about the cache and i have 2 issues in mind.

Let's imagine as an example a forum application, we got Forum, Thread, =
Message objects.

Forum 1 --> N Thread 1 ----> N Message ( bi directional associations)

First issue:

Forum1 get cached then accessed multiple times from the cache, while =
being accessed, getThreads() method is used.

At the end, we got a graph of objects and since the cache share the same =
reference to the Forum1, it will cache this graph of object, this could =
lead to caching the whole DB over the time...

Second issue:

In a multi threaded environement, multiple threads could get a copy from =
the cache of the Forum1 object, how to deal with the concurrency access =
of non-synchronized collections ?

Comments anyone ?

Best regards
Chris

Re: [Hibernate-devel] Find doesnt return all elements

[Gavin_King/Cirrus%<CI...@ci...>]

>If I execute this select directly in the db I get 77 results, but
>Hibernate returns only 11.

Thats *highly* wierd and I don't understand how it could be true....
we need to try and understand this better. Could you try stepping
through code to see if the JDBC ResultSet actually contains 77
rows? (Hibernate *does* actually have an extra layer to force
distinctness of results which were retrieved from the database
*without* SELECT DISTINCT but I don't really see how this could
be malfunctioning....)

>Another problem is that hibernate uses one more join than it actually
>should, (the shops table is accessed two times, and joined with itself
>on the primary key :))

Thanks for spotting this. This is an old bug I think. The code wasn't
being sufficiently selective in differentiating one-to-many associations
from many-to-many. Its now fixed in CVS.

Please grab a latest CVS snapshot and try stepping through code for me.
(Note that the generated SQL will be different this time.)

TIA

Gavin

[Hibernate-devel] Find doesnt return all elements

[Christoph S. <ch...@mc...>]

Hey all!

I have a strange problem:

I issue this query in hibernate:

        String query = "from vtrm in class " + Vtrm.class.getName() + ",
shop in vtrm.shops.elements where vtrm.status=5 and shop.shopkz=?";
        results = session.find(query, "WAP", Hibernate.STRING);

Hibernate issues this select:
Hibernate: SELECT DISTINCT vtrm.vtrmid, vtrm.begtag, vtrm.infurl,
vtrm.onstat, vtrm.kauter, vtrm.clubnr, vtrm.abldat, vtrm.wvsvor,
vtrm.laenge, vtrm.adddte, vtrm.titel2, vtrm.upddte, vtrm.titel1,
vtrm.wvspkl, vtrm.preise, vtrm.enduhr, vtrm.addgru, vtrm.updgru,
vtrm.inftel, vtrm.listid, vtrm.prliid, vtrm.addusr, vtrm.wv
sver, vtrm.updusr, vtrm.minaka, vtrm.beguhr, vtrm.iskind, vtrm.infeml,
vtrm.vortid, vtrm.status, vtrm.wvsmnr, vtrm.isclub, vtrm.anzknd,
vtrm.ordeml, vtrm.maxaka, vtrm.ntrmid, vtrm.endtag, vtrm.wvssnr,
vtrm.wvsmsv, vtrm.stadat, vtrm.vreihe FROM Vtrm vtrm, vtrm_x_shop shop,
vtrm_x_shop sho1 WHERE 1=1  and vtrm.vtrmid = sho1.vtrmid and
sho1.recnum=shop.recnum AND ( vtrm.status=5  ) and ( shop.shopkz=?  )

If I execute this select directly in the db I get 77 results, but
Hibernate returns only 11.

Another problem is that hibernate uses one more join than it actually
should, (the shops table is accessed two times, and joined with itself
on the primary key :))


I tried with cvs version and with hibernate 1.01b, both act the same.


This is my mapping:
<hibernate-mapping>
    <!-- at.mcg.clubticket.db.Vtrm root -->
    <class name="at.mcg.clubticket.db.Vtrm" table="Vtrm"
select="distinct">
      <id name="vtrmid" type="long" column="vtrmid">
        <generator class="sequence"/>
      </id>
      <!-- basic name="begtag" type="java.lang.Long" -->
      <property name="begtag" column="begtag" type="long"/>
      <!-- basic name="infurl" type="java.lang.String" -->
      <property name="infurl" column="infurl" type="string"/>
      <!-- basic name="onstat" type="java.lang.Long" -->
      <property name="onstat" column="onstat" type="long"/>
      <!-- basic name="kauter" type="java.lang.String" -->
      <property name="kauter" column="kauter" type="string"/>
      <!-- basic name="clubnr" type="java.lang.String" -->
      <property name="clubnr" column="clubnr" type="string"/>
      <!-- basic name="abldat" type="java.sql.Timestamp" -->
      <property name="abldat" column="abldat" type="timestamp"/>
      <!-- basic name="wvsvor" type="java.lang.String" -->
      <property name="wvsvor" column="wvsvor" type="string"/>
      <!-- basic name="laenge" type="java.lang.Long" -->
      <property name="laenge" column="laenge" type="long"/>
      <!-- basic name="adddte" type="java.sql.Timestamp" -->
      <property name="adddte" column="adddte" type="timestamp"/>
      <!-- basic name="titel2" type="java.lang.String" -->
      <property name="titel2" column="titel2" type="string"/>
      <!-- basic name="upddte" type="java.sql.Timestamp" -->
      <property name="upddte" column="upddte" type="timestamp"/>
      <!-- basic name="titel1" type="java.lang.String" -->
      <property name="titel1" column="titel1" type="string"/>
      <!-- basic name="wvspkl" type="java.lang.String" -->
      <property name="wvspkl" column="wvspkl" type="string"/>
      <!-- basic name="preise" type="java.lang.String" -->
      <property name="preise" column="preise" type="string"/>
      <!-- basic name="enduhr" type="java.lang.Long" -->
      <property name="enduhr" column="enduhr" type="long"/>
      <!-- basic name="addgru" type="java.lang.Long" -->
      <property name="addgru" column="addgru" type="long"/>
      <!-- basic name="updgru" type="java.lang.Long" -->
      <property name="updgru" column="updgru" type="long"/>
      <!-- basic name="inftel" type="java.lang.String" -->
      <property name="inftel" column="inftel" type="string"/>
      <!-- basic name="listid" type="java.lang.Long" -->
      <property name="listid" column="listid" type="long"/>
      <!-- basic name="prliid" type="java.lang.Long" -->
      <property name="prliid" column="prliid" type="long"/>
      <!-- basic name="addusr" type="java.lang.String" -->
      <property name="addusr" column="addusr" type="string"/>
      <!-- basic name="wvsver" type="java.lang.String" -->
      <property name="wvsver" column="wvsver" type="string"/>
      <!-- basic name="updusr" type="java.lang.String" -->
      <property name="updusr" column="updusr" type="string"/>
      <!-- basic name="minaka" type="java.lang.Long" -->
      <property name="minaka" column="minaka" type="long"/>
      <!-- basic name="beguhr" type="java.lang.Long" -->
      <property name="beguhr" column="beguhr" type="long"/>
      <!-- basic name="iskind" type="java.lang.Long" -->
      <property name="iskind" column="iskind" type="long"/>
      <!-- basic name="infeml" type="java.lang.String" -->
      <property name="infeml" column="infeml" type="string"/>
      <!-- basic name="vortid" type="java.lang.Long" -->
      <property name="vortid" column="vortid" type="long"/>
      <!-- basic name="status" type="java.lang.String" -->
      <property name="status" column="status" type="string"/>
      <!-- basic name="wvsmnr" type="java.lang.String" -->
      <property name="wvsmnr" column="wvsmnr" type="string"/>
      <!-- basic name="isclub" type="java.lang.Long" -->
      <property name="isclub" column="isclub" type="long"/>
      <!-- basic name="anzknd" type="java.lang.Long" -->
      <property name="anzknd" column="anzknd" type="long"/>
      <!-- basic name="ordeml" type="java.lang.String" -->
      <property name="ordeml" column="ordeml" type="string"/>
      <!-- basic name="maxaka" type="java.lang.Long" -->
      <property name="maxaka" column="maxaka" type="long"/>
      <!-- basic name="ntrmid" type="java.lang.Long" -->
      <property name="ntrmid" column="ntrmid" type="long"/>
      <!-- basic name="endtag" type="java.lang.Long" -->
      <property name="endtag" column="endtag" type="long"/>
      <!-- basic name="wvssnr" type="java.lang.String" -->
      <property name="wvssnr" column="wvssnr" type="string"/>
      <!-- basic name="wvsmsv" type="java.lang.String" -->
      <property name="wvsmsv" column="wvsmsv" type="string"/>
      <!-- basic name="stadat" type="java.sql.Timestamp" -->
      <property name="stadat" column="stadat" type="timestamp"/>
      <!-- basic name="vreihe" type="java.lang.String" -->
      <property name="vreihe" column="vreihe" type="string"/>
        <set role="shops" table="vtrm_x_shop" readonly="true"
lazy="true">
            <key column="vtrmid"/>
            <one-to-many class="at.mcg.clubticket.db.Vtrm_x_shop"/>
        </set>
    </class>
    <class name="at.mcg.clubticket.db.Vtrm_x_shop" table="vtrm_x_shop"
select="distinct">
      <id name="recnum" type="long" column="recnum">
        <generator class="sequence"/>
      </id>

      <!-- basic name="upddte" type="java.sql.Timestamp" -->
      <property name="upddte" column="upddte" type="timestamp"/>
      <!-- basic name="shopkz" type="java.lang.String" -->
      <property name="shopkz" column="shopkz" type="string"/>
      <!-- basic name="vtrmid" type="java.lang.Long" -->
      <many-to-one name="vtrm" class="at.mcg.clubticket.db.Vtrm"
column="vtrmid" outer-join="true" />
      <!-- basic name="status" type="java.lang.String" -->
      <property name="status" column="status" type="string"/>
      <!-- basic name="addusr" type="java.lang.String" -->
      <property name="addusr" column="addusr" type="string"/>
      <!-- basic name="updusr" type="java.lang.String" -->
      <property name="updusr" column="updusr" type="string"/>
      <!-- basic name="addgru" type="java.lang.Long" -->
      <property name="addgru" column="addgru" type="long"/>
      <!-- basic name="updgru" type="java.lang.Long" -->
      <property name="updgru" column="updgru" type="long"/>
      <!-- basic name="srtpos" type="java.lang.Long" -->
      <property name="srtpos" column="srtpos" type="long"/>
      <!-- basic name="adddte" type="java.sql.Timestamp" -->
      <property name="adddte" column="adddte" type="timestamp"/>
    </class>

  </hibernate-mapping>

Peace all!
 chris




--

MC Marketing GmbH.
IT Services

e-mail: cs...@mc...     *    http://www.mcmarketing.at
tel:   +4315240140-59             *     http://www.clubticket.at
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A-1070 Wien / Kirchengasse 32/1   *     http://www.time2bcool.at
           

Re: [Hibernate-devel] Use outer join

[Gavin_King/Cirrus%<CI...@ci...>]

>I have a bidirectional 1:n mapping like this, and I have set
>use_outer_join to true, but I cant get hibernate to fetch all elements
>at once with an outer join. (I'm using a find query)

Outerjoins are never used to fetch collection elements. Quite a few people
have asked for this but I'm not even convinced its a particularly great
thing to do (less trips to the database but more bandwidth usage and
presumaby more load on the database). The main reason it isn't
implemented is that I really need to redesign the whole way collections
are fetched to be able to do it. Originally collection fetching was
designed assuming that what you usually wanted was lazy initialization.
Outerjoin fetching is a very aggressive *eager* initialization.

At the moment outerjoin fetching is used only for <many-to-one>
and <one-to-one> associations. And its _not_ used from the first level
of a find() query (this is *not* a good thing).

Now that I finished most of the stuff that was very high on my TODO list
(over the past two weeks or so), I'm happy to move this issue (redesign
of the fetching code) up to the top of the list. I'd say its certainly
been the weakest area for a while now....

[Hibernate-devel] Use outer join

[Christoph S. <cs...@mc...>]

Hi Gavin and all others!

I have a bidirectional 1:n mapping like this, and I have set
use_outer_join to true, but I cant get hibernate to fetch all elements
at once with an outer join. (I'm using a find query)


        <set role="xxxx" table="xxxx" readonly="true">
            <key column="xxx"/>
            <one-to-many class="xxxx"/>
        </set>


What am I doing wrong?

Best regards
 Chris

RE: [Hibernate-devel] Query API

[Gavin_King/Cirrus%<CI...@ci...>]

>I would vote for this option.  In the past, I've had to write a lot of
>code that dynamically built JDBC.  As the SQL query string was built,
>I would collect parameter values in a seperate Collection.

I think we already sort of address this by having a generic method

  public void setParameter(int loc, Object value, Type type);

As long as you also collect a list of types, you are fine....

We can't provide a truly generic method because theres too much
ambiguity. eg. a java.lang.Long could by Hibernate's "long" type
or Hibernate's "serializable" type. A java.util.Date could be
"date", "time", timestamp", "serializable" or even, in theory, an
entity.

I suppose we could provide one which does a best guess ... so it
would pick a java.lang.Long as "long" but its still problematic
for Date.....

P.S. I have finished implementing named query parameters +
setFirstResult() and its all in CVS to try out.....

RE: [Hibernate-devel] Query API

[Urberg, J. <ju...@ve...>]

>> I suppose a way to dodge this issue would be to have a single method

   public void setObject(int position, Object val);

which checks if val is an entity, a persistent enum or Serializable and
uses whichever Type is appropriate but I would only go this way if
people think that would be a better API for other reasons..... (I think
its slightly inferior) <<

I would vote for this option.  In the past, I've had to write a lot of code
that dynamically built JDBC.  As the SQL query string was built, I would
collect parameter values in a seperate Collection.  When I was about to
execute the SQL, I'd just loop thru the Collection and call "setObject" to
bind the parameters.  I can see doing the same sort of thing with
Hibernate's query language and would hate to have to keep track of whether a
parameter is an entity or not so I can call the correct binding function.

Regards,
John Urberg

Re: [Hibernate-devel] Documentation in DocBook

[Christian B. <chr...@bl...>]

On 25 Jul (09:52), Pierer carion wrote:

> There is a very interesting tool in Jakarta :
> http://jakarta.apache.org/turbine/maven/
> This tool/environment, based on Java, allows you to 
> perform usual tasks automatically and even
> to generate the website :

Hm, I had a fist look at Maven and it may be possible to use it for
hibernate. I'm not happy with the default directory layout (to
simple) and some other things are still not clear. 

I will try to setup a hibernate project with Maven and report...

-- 
Christian Bauer
tu...@in...

[Hibernate-devel] Query API

[Gavin_King/Cirrus%<CI...@ci...>]

Hi everyone,

I just committed to CVS an experimental version of the new pageable
queries API. Its not quite finished yet, since it doesn't support
named query parameters + setFirstResult() is not yet implemented.

Also, I had always intended to refactor a bunch of code from
RelationalDatabaseSession (now renamed SessionImpl) to QueryImpl
but I havn't done that yet, since it wasn't the path of least
resistence. I still need to do it at some stage - SessionImpl
is an abominably huge class.

However, it would be cool if people could check it out and give
criticism.

A question I have is about the naming of this method on the Query
interface

   public void setEntity(int position, Object val);

(Used to bind an entity object to a JDBC parameter.)

The word "entity" is used liberally in the documentation, but not in
the actual code and never in the API. The method on class Hibernate that
gets an entity type is called "association". However "setAssociation"
sounds wrong.

I suppose a way to dodge this issue would be to have a single method

   public void setObject(int position, Object val);

which checks if val is an entity, a persistent enum or Serializable and
uses whichever Type is appropriate but I would only go this way if
people think that would be a better API for other reasons..... (I think
its slightly inferior)

I was never particularly happy with the using the word "entity" for what
I call "persistent object" in my head (and in the implementation code,
generally). However there *does* need to be a way to distinguish between
entity and value objects since both really fit the description "persistent
object".

The JDO spec calls these things "first class objects" and "second class
objects" which is okay, but not really that evocative.

Can anyone think of a better name?

TIA

Gavin

oh, PS, is "bindParameter, bindInteger" better than "setParameter,
setInteger"? I chose the latter to be consistent with JDBC....

Re: [Hibernate-devel] Documentation in DocBook

[Gavin_King/Cirrus%<CI...@ci...>]

>Actually you just need to be able to do a scp and
>a ssh to your hosting machine.
>I don't know if you have such a possibility with
>SourceForge.

Yeah, Sourceforge allows ssh + scp.

Re: [Hibernate-devel] Documentation in DocBook

[Pierer c. <pie...@ya...>]

Actually you just need to be able to do a scp and 
a ssh to your hosting machine. 
I don't know if you have such a possibility with
SourceForge.

Pierre
--- Gavin_King/Cirrus%CI...@ci... wrote:
> 
> Yeah, funnily enough, I've just been noticing maven
> at the JCS project.
> Unfortunately, I don't have anywhere to host the
> project, only
> Sourceforge. I presume you need an actual box with
> an application
> server to run maven.
> 


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RE: [Hibernate-devel] JCS integration

[Gavin_King/Cirrus%<CI...@ci...>]

<P>&gt;I'm building a 3-tier Java GUI. I'd like to be able to issue queries=
 using<BR>&gt;Hibernate, disconnect the Session and send it over the wire, =
get the queried<BR>&gt;objects out of the cache (and have any of those obje=
ct's related objects<BR>&gt;automatically come from the the cache if they'r=
e in it), make changes to the<BR>&gt;objects on the client side, send the w=
hole session back to the server,<BR>&gt;reconnect the Session to the dataso=
urce and flush to apply any updates that<BR>&gt;happened on either side to =
the database.<BR><BR>yeah, thats essentially doable at present. All you wou=
ld need is to make a<BR>little patch to allow deserialization of the sessio=
n in a process where<BR>its SessionFactory is missing. <BR><BR>The main pro=
blem for your application would be how to get a reference to <BR>the object=
s you need on the client side. If you returned the Session =5Fand=5F<BR>the=
 needed objects, it would work.<BR><BR>In a disconnected state, I *think* y=
ou would be able to call any Session<BR>methods except find(), flush(), loc=
k(), loadWithLock() (and load() for a <BR>missing object). Oh, and save() o=
f an object using native key generation. <BR>I would need to test this to b=
e sure though.<BR><BR>Currently the serialization/deserialization code is w=
ritten assuming that<BR>it is used for failover of stateful session bean or=
 servlet session state<BR>to another server with a SessionFactory of the sa=
me name. So you would<BR>need to remove that assumption.<BR><BR>Gavin</P>=

[Hibernate-devel] Futur enhancement of the cache / Stat

[Christian M. <vc...@cl...>]

In the futur, it might be a good idea to be able to get some stats about =
caches via the api.

The APi could list all regions used by hibernate and for each region =
give some basic stats about its usage ( Name of the region / attributes =
of the region / effectivness / nbr hit / nbr miss )

Best regards
Christian Meunier

FW: [Hibernate-devel] JCS integration

[Urberg, J. <ju...@ve...>]

>> I've no idea if its serializable, probably not, but that doesn't affect
serializability of the Session. This is the factory-level cache using
JCS, not the Session's own collection of loaded objects. <<

Guess I haven't looked very closely at the cacheing stuff yet.  I was
assuming it was part of the session/

>> Sessions are already serializable when disconnected and may be passed
on the wire. What exactly did you have in mind? <<

I'm building a 3-tier Java GUI.  I'd like to be able to issue queries using
Hibernate, disconnect the Session and send it over the wire, get the queried
objects out of the cache (and have any of those object's related objects
automatically come from the the cache if they're in it), make changes to the
objects on the client side, send the whole session back to the server,
reconnect the Session to the datasource and flush to apply any updates that
happened on either side to the database.

I didn't think that was possible in Hibernate yet, so I've been using my own
simple cache for now.

Regards,
John

[Hibernate-devel] maven/centipede

[Gavin_King/Cirrus%<CI...@ci...>]

>No app server is required for maven...  all content is statically
generated
>and uploaded using scp (and I think ssh).

Ah cool. I misoverstood.

>A similar tool is centipede (www.krysalis.org).

very cool.


If anyone wants to set up maven or centipede scripts for Hibernate,
they have my blessing (not enough time to do it myself though).

Re: [Hibernate-devel] Doc Addition + some extra stuff

[Eric E. <ev...@pr...>]

>
> >Third, I'm a IDE kind of guy (OK, I'm a lite-weight) and I never do
> >*anything* using the command line.
>
>I've been thinking about whats involved in making a real GUI tool for
>editing mappings of late. Its not yet near the top of the TODO, but
>it might eventually bubble up there. First I would want to learn
>Eclipse's windowing toolkit (cos' I just hate Swing).
>
>Anyway, I was thinking along the lines of:
>
>1. A window that represents a mapping document visually as a tree and
>allows nodes to be edited in a properties pane.
>2. Menu items:
>(a) generate skeletal mapping from class(es)
>(b) generate class(se) from current mapping
>(c) generate skeletal mapping from database table(s)
>(d) export schema to database
>which would all open up dialog boxes (which would, in turn, delegate to
>our commandline tools).
>
>I must confess though, I've never written an actual GUI application
>in my life. Only commandline and web applications. So this would be a real
>learning experience for me. The one time I had contact with the Swing
>TreeView was painful and scared me off for life....
>
>In a sense this is really just a generic XML editor though. The only thing
>different is that we want to provide some explanatory metadata to nodes and
>attributes. (And the added menu-items which are trivial to do.)
>
>Does anyone know of any XML-editor-frameworks out there ;) hehe. Or
>something opensource that I could just take and bend to my own
>purposes?


Yeah, I had been thinking about this as well.  My ideal tool would extend 
the idea of Hibernate as a service all the way into the build process of 
the business model.  It would include:

-Easy to use editor as you describe
-Ability to set preferences such as default text field lengths, id field 
names, collection types, etc and store them in the generated .xml (or in a 
central file for global settings).
-Ability to automate the mapping and schema gen and include it in the 
business object build process.  If there is a previous version of the .xml 
file, use its values for mappings that haven't changed and use defaults for 
everything else.
-<dream-on>Ability to detect existing tables and generate Alter Table 
scripts that preserve db data</dream-on>

My *ideal* build process would then be:
-Implement a business model
-Do a rough Hibernate mapping w/ the editor
-Tweak the mapping w/ the editor
-Modify business model and rebuild project W/O losing mapping tweaks

One thing I can see happening in this scheme or any editor that saves state 
is that the dtd is going to have to make room for some fluff UI tags.

I had been using the data binding packages that came with JBuilder 
(DataExpress and dbSwing) for this type of work, but they seem to be 
extremely buggy and the source code is not available unless you've got cash 
to burn.  Lately, I've heard of several xml data binding strategies, but I 
haven't had a chance to check them out.  I would certainly be interested in 
pitching in on something like this - let me know when you would like to 
take a stab at it.



> > there is one hitch: The map gen tool creates a doctype declaration like
> > this:
> >
> ><!DOCTYPE hibernate-mapping SYSTEM "DTD_PATH/hibernate-mapping.dtd">
>
>urrrghhh yuck. Theres no good reason to use a SYSTEM ID now anyway.
>I will change this ASAP.

Great - thanks for the tweak.

Cheers,

Eric Everman

Re: [Hibernate-devel] Documentation in DocBook

[Glen S. <gs...@ip...>]

No app server is required for maven...  all content is statically generated
and uploaded using scp (and I think ssh).

A similar tool is centipede (www.krysalis.org).

Regards,

Glen Stampoultzis  (TriNexus Pty Ltd)
Fixed:+61 3 9753-6850     Mob:+61 (0)402 835 458
ICQ:  62722370    EMail:  gl...@ap...
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>
> Yeah, funnily enough, I've just been noticing maven at the JCS project.
> Unfortunately, I don't have anywhere to host the project, only
> Sourceforge. I presume you need an actual box with an application
> server to run maven.
>
>
>
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RE: [Hibernate-devel] JCS integration

[Gavin_King/Cirrus%<CI...@ci...>]

>Is a JCS cache serializable?  If so, how much more would it take to
>pass the whole session over the wire?

I've no idea if its serializable, probably not, but that doesn't affect
serializability of the Session. This is the factory-level cache using
JCS, not the Session's own collection of loaded objects.

Sessions are already serializable when disconnected and may be passed
on the wire. What exactly did you have in mind?

(well, they are serializable if the persistent object are serializable...)

Re: [Hibernate-devel] Documentation in DocBook

[Gavin_King/Cirrus%<CI...@ci...>]

Yeah, funnily enough, I've just been noticing maven at the JCS project.
Unfortunately, I don't have anywhere to host the project, only
Sourceforge. I presume you need an actual box with an application
server to run maven.

Re: [Hibernate-devel] Doc Addition + some extra stuff

[Gavin_King/Cirrus%<CI...@ci...>]

>First, here is some documentation on the --abstract switch for the mapping

thanks, I knew that was missing.

>Second, I've noticed that when using JUnit, the 'reload classes for each
>test' option throws the logging system into a tail spin that prevents
JUnit
>from running.  Using the JUnit "-noloading" application parameter prevents
>class reloading and avoids the problem - maybe this could be included in a
>FAQ section or something.

hhmmmm....we dont have a real FAQ yet. If someone wants to volunteer to
maintain one, that would be very cool. Unfortunately I honestly don't
have time to do this myself.

>Third, I'm a IDE kind of guy (OK, I'm a lite-weight) and I never do
>*anything* using the command line.

I've been thinking about whats involved in making a real GUI tool for
editing mappings of late. Its not yet near the top of the TODO, but
it might eventually bubble up there. First I would want to learn
Eclipse's windowing toolkit (cos' I just hate Swing).

Anyway, I was thinking along the lines of:

1. A window that represents a mapping document visually as a tree and
allows nodes to be edited in a properties pane.
2. Menu items:
(a) generate skeletal mapping from class(es)
(b) generate class(se) from current mapping
(c) generate skeletal mapping from database table(s)
(d) export schema to database
which would all open up dialog boxes (which would, in turn, delegate to
our commandline tools).

I must confess though, I've never written an actual GUI application
in my life. Only commandline and web applications. So this would be a real
learning experience for me. The one time I had contact with the Swing
TreeView was painful and scared me off for life....

In a sense this is really just a generic XML editor though. The only thing
different is that we want to provide some explanatory metadata to nodes and
attributes. (And the added menu-items which are trivial to do.)

Does anyone know of any XML-editor-frameworks out there ;) hehe. Or
something opensource that I could just take and bend to my own
purposes?

> there is one hitch: The map gen tool creates a doctype declaration like
> this:
>
><!DOCTYPE hibernate-mapping SYSTEM "DTD_PATH/hibernate-mapping.dtd">

urrrghhh yuck. Theres no good reason to use a SYSTEM ID now anyway.
I will change this ASAP.

Thanks Eric

Re: [Hibernate-devel] Re: JCS integration

[Gavin_King/Cirrus%<CI...@ci...>]

>Found 2 issues with the current cache code:
>
>one with the <jcs-cache> tag, i edited vertex.hbm.xml to do my testing.
>If i place the <jcs-cache> tag just after the <class> one it "works" , no
>error while parsing the xml
>If i place the <jcs-cache> tag after </subclass> and before </class> , got
>an error parsing the xml:

This is intended. I decided it was too easy to miss the <cache> tag
where it is now.

>Other error comes from the fact the class CacheEntry does not implement
>Serializable, it's mandatory that class going to the cache are
serializable.
>quick fix : ClassPersister.java line 1035

Done. Thanks for that. I had been testing against the in-memory cache only.

>- I thought the key was a composite one.... ( tableName + PK ), it appears
>it's only the PK ( if we want to be able to share a region cache among
> multiple classes we need a unique key)

Currently the factory-level caches hold instances of just a single class,
hence we don't need to use the tablename. If theres a really good reason
why we might want to keep all cached data in a single JCS region, we can
actually implement that directly in cirrus.hibernate.JCSCache, since it
knows the name of the rootclass it is caching. Actually thst such a small
amount of work I might just _do_it_....

Is there any really major advantage to keeping everything in one region?

>- Then i try to re enter the show command, i would expect to get some
"Cache
>hit: xxx" debug info , but i get none.Are we sure that Hibernate does
check
>the cache properly ?

yup, I'm quite sure. But show can't utilize the cache because it uses
find() queries. The query goes to the database and retrieves the whole
object in one step. If you want to see some cache hits try an iterate()
query, or something with associations when use_outer_join is disabled.
.....or various other situations where the cache *is* used.

P.S. We really need to implement caching for collections if we want to
use this stuff most efficiently. I don't think theres anything
particularly technically difficult about that ... I just need to *do*
it. If anyone else wants to volunteer for this, give me a yell and
I'll tell you what needs to be done....

[Hibernate-devel] Re: JCS integration

[Christian M. <vc...@cl...>]

Found 2 issues with the current cache code:

one with the <jcs-cache> tag, i edited vertex.hbm.xml to do my testing.

If i place the <jcs-cache> tag just after the <class> one it "works" , no
error while parsing the xml

If i place the <jcs-cache> tag after </subclass> and before </class> , got
an error parsing the xml:

Other error comes from the fact the class CacheEntry does not implement
Serializable, it's mandatory that class going to the cache are serializable.

quick fix : ClassPersister.java line 1035

 private final class CacheEntry implements Serializable {

Other observations:

Got 3 vertex in my app and when i enter the show command, got debug info:

134383 [main] DEBUG cache.ReadOnlyCache  - Caching: 0
134383 [main] DEBUG cache.ReadOnlyCache  - Caching: 1
134383 [main] DEBUG cache.ReadOnlyCache  - Caching: 2

- I thought the key was a composite one.... ( tableName + PK ), it appears
it's only the PK
( if we want to be able to share a region cache among multiple classes we
need a unique key)

- Then i try to re enter the show command, i would expect to get some "Cache
hit: xxx" debug info , but i get none.Are we sure that Hibernate does check
the cache properly ?

best regards
Christian Meunier

----- Original Message -----
From: <Gavin_King/Cirrus%CI...@ci...>
To: <hib...@li...>
Cc: <vc...@cl...>
Sent: Thursday, July 25, 2002 5:09 PM
Subject: JCS integration


> Christian Meunier got me started with some code to integrate Apache
> Tubine's JCS today. I ended up rewriting much of the Cache package and
> making some big improvements. Anyway, you may now specify a JCS cache in
> the mapping file using
>
>   <jcs-cache usage="read-only"/>
>
> or
>
>   <jcs-cache usage="read-write"/>
>
> You must then configure the cache in the resource /cache.ccf
>
> I will deprecate the old homegrown cache soon.
>
> JCS supports things like in-memory LRU caching, disk-caching, distributed
> caching, etc but be careful of using a distributed cache with usage
> ="read-write". That probably wont work.
>
> All in CVS....
>
>

RE: [Hibernate-devel] JCS integration

[Urberg, J. <ju...@ve...>]

Is a JCS cache serializable?  If so, how much more would it take to pass the
whole session over the wire?

Thanks,
John

-----Original Message-----
From: Gavin_King/Cirrus%CI...@ci...
[mailto:Gavin_King/Cirrus%CI...@ci...]
Sent: Thursday, July 25, 2002 10:09 AM
To: hib...@li...
Cc: vc...@cl...
Subject: [Hibernate-devel] JCS integration


Christian Meunier got me started with some code to integrate Apache
Tubine's JCS today. I ended up rewriting much of the Cache package and
making some big improvements. Anyway, you may now specify a JCS cache in
the mapping file using

  <jcs-cache usage="read-only"/>

or

  <jcs-cache usage="read-write"/>

You must then configure the cache in the resource /cache.ccf

I will deprecate the old homegrown cache soon.

JCS supports things like in-memory LRU caching, disk-caching, distributed
caching, etc but be careful of using a distributed cache with usage
="read-write". That probably wont work.

All in CVS....



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_______________________________________________
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Re: [Hibernate-devel] Documentation in DocBook

[Pierer c. <pie...@ya...>]

There is a very interesting tool in Jakarta :
http://jakarta.apache.org/turbine/maven/
This tool/environment, based on Java, allows you to 
perform usual tasks automatically and even
to generate the website :

As an example of project using marven, you can
have a look at :
http://jaxen.org/

Pierre

> I would very much prefer Ant if its at all possible.
> I've finally
> started using the ant build script to generate
> javadoc, etc, So
> it would be really nice to integrate this stuff with
> the existing
> stuff. My dream is to eventually be able to do a
> whole release
> with just a single Ant task but I'm not there yet ;)



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