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Page: Topic Design
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$SYS Topics AC ACL Design Alarm Authentication Benchmark Bridge Client State Cluster Design Cluster Configuration Dashboard Design EMQ X Roadmap Event Design FAQ Firewall Get Started HTTP Publish Home Hooks Design Improve the Session Queue Design Inflight Window of Broker Installation Overview Plugin Design Presence PubSub Design PubSub Sequence Queue Design Quick Start Rate Limiting and Flow Control Rewrite Session Design Topic Design Trace User Guide WebSocket Zone based authentication ACL benchmark for 0.10.4 release benchmark for 0.12.0 release benchmark for 0.13.0 release eMQTT Design emqttd and rabbitmq emqttd.init etc emqttd.config for benchmark etc vm.args for benchmark linux kernel tuning
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Topic Design
Ery Lee edited this page 2015-04-13 15:29:09 +08:00
Table of Contents

Topic Types

static: created when broker started

dynamic: created when subscribed, destroyed when unsubscribed

Direct or wildcard

Direct:

a/b/c/d

wildcard:

a/+/b a/#

SYS Topic

$SYS/#

Process

Create Topic

  1. create trie subtree...
  2. create topic

Subscribe Topic

  1. create topic if not existed
  2. create subscriber

Unsubscribe Topic

  1. remove subscriber
  2. remove topic if no subscribers
  3. remove trie nodes if no topic

Trie Tree

Version: 1.0(Draft) Author: Feng Lee feng@emqx.io