Details

PublishSubscribe

A simple and flexible publish-subscribe pattern implementation for PHP, JavaScript, Python

PublishSubscribe

version: 2.0.0

Supports nested topics, tagged topics and namespaced topics.

Topic structure:

[Topic1[/SubTopic11/SubTopic111 ...]][#Tag1[#Tag2 ...]][@NAMESPACE1[@NAMESPACE2 ...]]

• A topic can be nested with one or more levels, all matching levels will be notified in order from specific to general
• A topic can also be tagged with one or more tags, only matching levels whose registered tags are matched will be notified
• A topic can also be namespaced with one or more namespaces, all matching levels will be notified if no namespace given when event triggered, else only the levels whose namespaces are matched (this is similar to tags above)
• All/Any of the above can be used simultaneously, at least one topic OR tag OR namespace should be given for an event to be triggered

Namespaces work similarly to jQuery namespaces (so handlers can be unsubscribed based on namespaces etc..).

The difference, between tags and namespaces, is that when a topic is triggered without tags and namespaces, handlers which match the topic will be called regardless if they have namespaces or not, while handlers that match the topic but also have tags will not be called.

All topic separators (i.e "/", "#", "@") are configurable per instance.

During the publishing process, an event can be stopped and/or cancel the bubble propagation.

API

see /test folder

const pb = new PublishSubscribe();
// set topic/tag/namespace separators for this pb instance
// defaults are:
// Topic separator = "/"
// Tag separator = "#"
// Namespace separator = "@"
pb.option('topic_separator', "/");
pb.option('tag_separator', "#");
pb.option('namespace_separator', "@");
// subscribe a handler for a topic with optional tags and optional namespaces
pb.on(topic_with_tags_namespaces, handler);
// subscribe a handler only once for a topic with optional tags and optional namespaces
// handler automatically is unsubscribed after it is called once
pb.one(topic_with_tags_namespaces, handler);
// subscribe a handler on top (first) for a topic with optional tags and optional namespaces
pb.on1(topic_with_tags_namespaces, handler);
// subscribe a handler only once on top (first) for a topic with optional tags and optional namespaces
// handler automatically is unsubscribed after it is called once
pb.one1(topic_with_tags_namespaces, handler);
// unsubscribe a specific handler or all handlers matching topic with optional tags and optional namespaces
pb.off(topic_with_tags_namespaces [, handler = null]);
// publish a topic with optional tags and optional namespaces and pass any data as well
pb.emit(topic_with_tags_namespaces, data);
// pipeline allows to call subscribers of given topic/message asynchronously via a pipeline
// each subscriber calls next subscriber via the passed event's .next() method
// pipeline can be aborted via the passed event's .abort() method
// optional finish_callback will be called when the pipeline finishes the chain or event is aborted
pb.pipeline(topic_with_tags_namespaces, data [, abort_callback [, finish_callback]]);
// dispose PublishSubscribe instance
pb.disposePubSub();

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