Cache method suitable for publish-subscribe system in mobile environment

Abstract

The invention discloses a cache method suitable for a publish-subscribe system in a mobile environment. The method comprises the following steps: cache starting: before a subscriber is disconnected, publishing an interconnection message to an entire network, and starting cache; cache ending: when the subscriber reconnects the network, publishing a reconnection message to the entire network, and ending cache; cache subscribing and responding: when the subscriber sends a cache request, publishing the cache request to the entire network, and acquiring cache. The method has the beneficial effects that a proper cache position is selected under the comprehensive consideration of the mobility characteristic and network characteristic of the subscriber, and delay of event cache is reduced remarkably for the subscriber, so that the efficiency is increased; the method has high adaptability no matter the subscriber moves at equal probability among each position or moves frequently within a certain local range; a proper position cache event is selected in an event dispatching path, so that the network load is reduced, and the network performance is optimized.

Description

technical field [0001] The invention belongs to the technical field of publish-subscribe systems, and in particular relates to a caching method of a publish-subscribe system applicable to mobile scenarios. Background technique [0002] A publish-subscribe system consists of a distributed communication network, the event broker network, and a series of endpoints communicating with each other, namely subscribers and publishers. Subscribers and publishers are interconnected through an event proxy network, and an asynchronous publish-subscribe method is used to complete data exchange. Subscribers submit subscriptions by declaring a filter condition expression. When a publisher publishes an event that meets its subscription conditions, the event is routed to the subscriber through the proxy network. In terms of time, subscription and publication of content are asynchronous, and in terms of space, subscribers and publishers do not need to care about where each other is located. T...

AI Technical Summary

Problems solved by technology

The problem of caching in the mobile scenario is how to cache the subscribed content during the mobile period of the subscriber, and at the same time ensure the availability of the cache and the efficiency of the user's access to the cached content. The extension to the mobile environment also provides support for publishing and subscription The system brings many new challenges

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