Metadata Notifications to Remote Targets

Date	2010/10/16
Contact(s)	heikki
Status	draft
Assigned to release	2.7.x
Resources	resources made available through Kingdom of Sweden

Overview

A function in GeoNetwork that can push notifications about metadata inserts, updates and deletes, to configurable remote destinations.

Proposal Type

• Type: Kernel, GUI Change
• App: GeoNetwork
• Module: since when do we have modules ?

Links

• Documents:
• Email discussions:
• Other wiki discussions:

Voting History

• Vote proposed by X on Y, result was +/-n (m non-voting members).

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Motivations

In GeoNetwork 3.x, the GeoNetwork CSW/ebRIM interface creates ebRIM registry objects about ISO19139 metadata. It is kept up-to-date by a mechanism that sends a message from "legacy" GeoNetwork to the CSW/ebRIM application, everytime a metadata is inserted, deleted or updated in GeoNetwork. Now, the Kingdom of Sweden wants to have a very similar function to push this info to some remote servlet they use. This proposal aims to make this a generally available option in GeoNetwork.

Proposal

The metadata-push-mechanism implemented in GeoNetwork 3.x is moved forward to GeoNetwork 2.7.x. It is also modified a bit such that the notifications are sent to a configurable (through the GUI) list of remote destinations (rather than to a single destination specified in config.xml). Another modification is that the result of the notifications is tracked and in case of failure, tried once per 24 hours until it succeeds or until the failed notification target is removed.

The interface used by the notification pusher is:

Parameters:

action: update/delete
uuid: uuid for metadata
XMLFile: metadata content (only required in update action)

The Update action is used to create or update metadata records. This has to be managed by the remote service.

The remote service is expected to return an appropiate HTTP error code if some exception happens.
HTTP Post is used to communicate with the remote services.

Failed notifications (identified by error HTTP status) are registered and tried again once every 24h until either the notification push succeeded or an Administrator user removes the remote target destination from GeoNetwork's configuration.

Administrator users can configure zero or more destinations when logged in. The page to do it looks like this:

Backwards Compatibility Issues

None known

Risks

None known

Participants

• Jose Garcia
• Heikki Doeleman