Isn't Haggle really a publish-subscribe system?

Well yes, in many ways it is a pub-sub system for DTNs. But it is quite different from pub-sub systems that are created for the Internet. Internet pub-sub systems typically use an overlay, such as a distributed hash table (DHT), to disseminate events about where content matching a user's subscription has been published.

The subscriber can then choose to pull the content from one of the publishers. Obviously, this pull approach does not work in a disconnected DTN-style network. Haggle instead disseminates a user's profile (called the node description) in the network, and when the profile matches some data on another user's device, that device may try to push the matching data to the owner of the profile.

This push approach works better without end-to-end paths, which are not always available in the networks that Haggle targets. A novelty of Haggle, compared to other pub-sub systems, is how published data is matched against user interests (the subscriptions). Pub-sub systems generally ... more.

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