common practice of managing metadata with Slide

6/12/06, Lixin Chu <lixin.chu (AT) gmail (DOT) comwrote:
I realized that proppatchmethod will create a new version for a versioned
resource.

if this is true, I am afraid that I cannot make use of this mechanism to
support custome properties.

Is it really true ?

The specific custome property I would like to have is a list of users who
are interested in the update of the resource (file or folder). I wanted to
do something when the watched resource is changed (new version uploaded, or
deleted for example).

I notice that there is a subscribe method, but do not know how to program
it; googled but did not find detailed enough examples.

any idea ?

As of the notification :

2 make a long story short you have to implement your subscriber (
implements ) in order to reply to the
listener. The method that's being called is public void notify(String
uri, Map information) ; This way you can implement your emailer .

What I did was mantaining a list of users/resource/type of
subscription in a private webdav folder so that I didn't have to
bother with users deleting properties that mattered from the resources
themselves .

In my implementation of Subscriber I had something like

public void notify(String uri, Map information) {
printInfos(uri,information,logger);
if ( users != null && !users.isEmpty() ){
sendSmtpMail(message + "\n\n" +
createMessageBody(uri,information));
} else {
logger.warning("users list is empty");
}
}

Then you have to implement your own methods for sending email .

I'll come back on this if you need more.

Cheers

Marco

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Hi Marco,
I am also interested in how you organize your private folder where you keep
the resource/user/type information.

thanks
lixin

6/12/06, Marco Ferretti <marco.ferretti (AT) gmail (DOT) comwrote:

6/12/06, Lixin Chu <lixin.chu (AT) gmail (DOT) comwrote:
I realized that proppatchmethod will create a new version for a
versioned
resource.

if this is true, I am afraid that I cannot make use of this mechanism to
support custome properties.

Is it really true ?

The specific custome property I would like to have is a list of users
who
are interested in the update of the resource (file or folder). I wanted
to
do something when the watched resource is changed (new version uploaded,
or
deleted for example).

I notice that there is a subscribe method, but do not know how to
program
it; googled but did not find detailed enough examples.

any idea ?
--
As of the notification :

2 make a long story short you have to implement your subscriber (
implements ) in order to reply to the
listener. The method that's being called is public void notify(String
uri, Map information) ; This way you can implement your emailer .

What I did was mantaining a list of users/resource/type of
subscription in a private webdav folder so that I didn't have to
bother with users deleting properties that mattered from the resources
themselves .

In my implementation of Subscriber I had something like

public void notify(String uri, Map information) {
printInfos(uri,information,logger);
if ( users != null && !users.isEmpty() ){
sendSmtpMail(message + "\n\n" +
createMessageBody(uri,information));
} else {
logger.warning("users list is empty");
}
}
--
Then you have to implement your own methods for sending email .

I'll come back on this if you need more.
--
Cheers

Marco

To unsubscribe, e-mail: slide-user-unsubscribe (AT) jakarta (DOT) apache.org
For additional commands, e-mail: slide-user-help (AT) jakarta (DOT) apache.org
--

Hi Marco,
thanks for your info. some questions: the webdavResoruce has one method:

public Subscription
<>
*subscribeMethod*(java.lang.String path,
java.lang.String notificationType,
java.lang.String callback,
long notificationDelay,
int depth,
long lifetime)

I suppose this is used to tell Slide that I am interested in the change made
to the 'path'. But I do not know how to register the Subscriber. and also
what do we have in the Map information ? the API doc does not tell us more
abt this though.

more question, does this subscribeMethod is valid for the current http
session ? I am developing a Struts+Spring based web application. The feature
is something like this:

user can subscribe to the changes made to the resources (files/folders)
when something happened, a notification msg is sent by Slide to my web
application; the web application then log necessary information, like who
and what action was done to the resource.

Does your solution work in this way:
- when we start the web application, we check a special folder in Slide to
get any existing subscritions, then webdavResource.subscribeMethod() one by
one with a long enough lifetime;
- when user wants to monitor a resource, the web application add the
request into the special folder, and also webdavResource.subscribeMethod()
it.
- when a notification arrives, the registered Subscriber class will get the
user list and send msg to all subscribers

thanks !

6/12/06, Marco Ferretti <marco.ferretti (AT) gmail (DOT) comwrote:

6/12/06, Lixin Chu <lixin.chu (AT) gmail (DOT) comwrote:
I realized that proppatchmethod will create a new version for a
versioned
resource.

if this is true, I am afraid that I cannot make use of this mechanism to
support custome properties.

Is it really true ?

The specific custome property I would like to have is a list of users
who
are interested in the update of the resource (file or folder). I wanted
to
do something when the watched resource is changed (new version uploaded,
or
deleted for example).

I notice that there is a subscribe method, but do not know how to
program
it; googled but did not find detailed enough examples.

any idea ?
--
As of the notification :

2 make a long story short you have to implement your subscriber (
implements ) in order to reply to the
listener. The method that's being called is public void notify(String
uri, Map information) ; This way you can implement your emailer .

What I did was mantaining a list of users/resource/type of
subscription in a private webdav folder so that I didn't have to
bother with users deleting properties that mattered from the resources
themselves .

In my implementation of Subscriber I had something like

public void notify(String uri, Map information) {
printInfos(uri,information,logger);
if ( users != null && !users.isEmpty() ){
sendSmtpMail(message + "\n\n" +
createMessageBody(uri,information));
} else {
logger.warning("users list is empty");
}
}
--
Then you have to implement your own methods for sending email .

I'll come back on this if you need more.
--
Cheers

Marco

To unsubscribe, e-mail: slide-user-unsubscribe (AT) jakarta (DOT) apache.org
For additional commands, e-mail: slide-user-help (AT) jakarta (DOT) apache.org
--

6/13/06, Lixin Chu <lixin.chu (AT) gmail (DOT) comwrote:
Hi Marco,
thanks for your info. some questions: the webdavResoruce has one method:

public Subscription
<>
*subscribeMethod*(java.lang.String path,
java.lang.String notificationType,
java.lang.String callback,
long notificationDelay,
int depth,
long lifetime)
--
I suppose this is used to tell Slide that I am interested in the change made
to the 'path'. But I do not know how to register the Subscriber. and also
what do we have in the Map information ? the API doc does not tell us more
abt this though.

Actually, what I do is I create a listener and then add subscribers to
it so that I can get the callbacks I don't create subscriptions
but Subscriber(s)

more question, does this subscribeMethod is valid for the current http
session ? I am developing a Struts+Spring based web application. The feature
is something like this:

user can subscribe to the changes made to the resources (files/folders)
when something happened, a notification msg is sent by Slide to my web
application; the web application then log necessary information, like who
and what action was done to the resource.
I use it as a process instantiated by the server ; it is a servlet
that runs in background, so I suppose yes

Does your solution work in this way:
- when we start the web application, we check a special folder in Slide to
get any existing subscritions, then webdavResource.subscribeMethod() one by
one with a long enough lifetime;
- when user wants to monitor a resource, the web application add the
request into the special folder, and also webdavResource.subscribeMethod()
it.
- when a notification arrives, the registered Subscriber class will get the
user list and send msg to all subscribers

Exactly .
thanks !

no probs .

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6/13/06, Lixin Chu <lixin.chu (AT) gmail (DOT) comwrote:
Hi Marco,
I am also interested in how you organize your private folder where you keep
the resource/user/type information.

Well, my problem was that I had to enable users to watch files in a
document management system,

RT -
|
user ( as collection )
|
UrlEncoder.encode(path/to/resource)
( as collection )

where RT is the root path of your private directory ( collection ) .
The user collection has the same name as the username; I keep the
e-mail address as a property of the collection .
Each path has a property that says which type of subscriptions are
submitted for the current user.

Then, in my servlet, I create a listener on the RT directory, so
that I am notified of every change in the tree and I can operate with
subscribing & unsubscribing in the servlet itself. The system operates
in the directory ( never directly on webdav subscriptions ) : there is
only one class that minds about the callbacks.

More, internally ( in memory ) data is organized a little differently
than on disk : since you get the callback for the resource ( a path )
you need to organize data in maps that have
UrlEncoder.encode(path/to/resource) as key and the list of users
subscribed as data.

Another pit : I had ( on a tomcat based server ) to put the
initialization of the servlet ( reading the dav tree and so on ) in a
separate thread it was stopping the server for too long making
impossible for the webdav server to start up properly.

cheers

Marco

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