Realizes persistent notifications for users of DeepaMehta 4 across sessions and screens.
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DeepaMehta 4 Notifications

The DeepaMehta 4 Notifications plugin makes it easy for developers to create persistent notifications across sessions and screens. It furthermore takes care that the notifications end up in the recipients Private Workspace.

The use case is:

A user subscribes a topic. The user is notified when the topic is changed.

Actually the plugin provides:

  • A Notification model (a Topic Type for the message)
  • A Subscription model (an Association Type for the configurations)
  • A service to
    • Manage subscriptions (subscribe/unsubscribe)
    • Create notifications (persistent notifcations for all users who subscribed given item)

Usage: Subscribe items to receive notifications

A subscription is created (using DeepaMehta's Webclient) through using the Subscribe command on topics or drawing an association of type Notification Subscription between your Username topic and a topic of type Workspace, Topicmap or Note. For example see the following screenshot.

Notification Subscription Example: "admin" subscribed to three items

For the mentioned subscriptions the following actions will notify subscribers:

  • Workspace: Whenever a New Topicmap (which is not Private) is created in it
  • Topicmap: Whenever another user with write permission adds a topic to it
  • Note: Whenever another user with WRITE permissions Edits the notes content
    (In this case, the notificiation includes the old and the new contents of the topic, example)

Accessing notifications (In-App)

When logged in you find your notifications related to your username (click it to reveal your User Account topic in the in the upper right corner of the DeepaMehta Webclient). Then, reveal the very first topic, the one which represents your actual Username. Related to this item you will find all Notifications.

Accessing your notification in the Webclient

Sorry for this inconvenience. Currently we have no special display which delivers you notifications in a more convenient way. But of course, you're very welcome to encourage us or help us to design or create one :)

Your Notifications are accessible and readable to you only (unless you share them). For that reason you can find your notifications also in the related section after revealing your Private Workspace.


DeepaMehta 4 is a platform for collaboration and knowledge management.

To be able to install this module you first and additionally have to install the following DeepaMehta 4 Plugins.

Download & Installation

You can download the latest stable dm48-notifications-Bundle here.

After downloading the bundle-files, place both plugins (dm4-websockets & dm4-notifications) in the bundles-deploy folder of your DeepaMehta 4 installation.

Application Model

Screenshot of Notification Model in DM, Selected TopicType Notification

GNU Public License

This sofware is released under the terms of the GNU General Public License in Version 3.0, 2007.

Version History

1.2, Aug 11, 2017

Maintenance release:

  • Adapted to be compatible with DeepaMehta 4.8.6 and DM 4 Websockets 0.4

1.1, Jan 04, 2017

  • Renamed plugin to dm4-notifications as the new better expresses what this plugin is all about
  • Removed dependency to dm4.tags module
  • Introduced Subscribe topic command
  • Renamed all type URIs
  • Allows to create subscriptions around any type of topic
  • Adapted client side plugin.js to receive websocket notifications (broadcasts)
  • Associates subscriptions to (public) username instead of (private) user account topics
  • Stores all notifications in the "Private Workspace of the subscribed user
  • Per default: Support subscriptions of changes in a Workspace (New Topicmaps), in a Topicmap (Topics added) or to a Notes (Content updated)
  • Compatible with DeepaMehta 4.8

Note: This release is not compatible with previous releases and there is no migration provided.

1.0.3, Dec 25, 2014

  • compatible with DeepaMehta 4.4
  • code revision

1.0.2, Nov 17, 2014

  • revised service method signatures
  • introducing some javadoc
  • compatible with DM 4.3

1.0.0, May 13 2014

  • Introducing persistent Notifications and a Subscription edge
  • compatible with DM4.2

Author: Malte Reißig, 2014 - 2017