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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CELIX-389) Publisher / subscriber implementation
Date Thu, 22 Dec 2016 13:26:58 GMT

    [ https://issues.apache.org/jira/browse/CELIX-389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15770049#comment-15770049

ASF GitHub Bot commented on CELIX-389:

Github user rlenferink closed the pull request at:


> Publisher / subscriber implementation
> -------------------------------------
>                 Key: CELIX-389
>                 URL: https://issues.apache.org/jira/browse/CELIX-389
>             Project: Celix
>          Issue Type: Improvement
>            Reporter: Roy Lenferink
> Over the past few months I've been working together with Pepijn Noltes,
> Erjan Altena and Gabriele Ricciardi on a (secure) publisher / subscriber implementation,
which is based on the concepts of the remote service admin (i.e. rsa / topology / discovery
> Publishers are senders of data, subscribers can receive data. Publishers
> can publish/send data to certain channels (called 'topics' further on), subscribers can
subscribe to these topics. For every topic a publisher service is created by the pubsub admin.
This publisher is announced through etcd. So etcd is used for discovery of the publishers.
Subscribers are also registered as a service by the pubsub admin and will watch etcd for changes
and when a new publisher is announced, the subscriber will check if the topic matches its
interests. If the subscriber is interested in/subscribed to a certain topic, a connection
between publisher and subscriber will be instantiated by the pubsub admin.
> The dfi library is used for message serialization. The publisher / subscriber implementation
will arrange that every message which will be send gets an unique id.
> For communication between publishers and subscribers UDP and ZeroMQ can be used. When
using ZeroMQ it's also possible to setup a secure connection to encrypt the traffic being
send between publishers and subscribers. This connection can be secured with ZeroMQ by using
a curve25519 key pair per topic.
> The publisher/subscriber implementation supports sending of a single
> message and sending of multipart messages.

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