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Routing occurs only between WAMP Sessions that have joined the same Realm. A WAMP Session is joined to a _Realm_ on a Router. WAMP _Sessions_ are established over a WAMP Connection. Connections can use any _transport_ that is message-based, ordered, reliable and bi-directional, with WebSocket as the default transport. WAMP _Connections_ are established by Clients to a Router. A _Client_ is a component which implements any or all of the Subscriber, Publisher, Caller, or Callee roles. The routed RPC messaging pattern also defines three roles: _Callers_ and _Callees_, which communicate via a _Dealer_.Ī _Router_ is a component which implements one or both of the Broker and Dealer roles. The PubSub messaging pattern defines three roles: _Subscribers_ and _Publishers_, which communicate via a _Broker_. on a NATted connection) but which can establish an outgoing connection to the WAMP router.Ĭombining these two patterns into a single protocol allows it to be used for the entire messaging requirements of an application, thus reducing technology stack complexity, as well as networking overheads. This enables the calling of procedures in components which are not reachable externally (e.g. There is also no longer a need for a direct connection between the caller and the callee, since all traffic is routed. The decoupling in routed RPCs arises from the fact that the Caller is no longer required to have knowledge of the Callee it merely needs to know the identifier of the procedure it wants to call. Routed RPCs differ from traditional client-server RPCs in that the router serves as an intermediary between the Caller and the Callee. Other components, _Callers_, can then call the procedure, with the router invoking the procedure on the Callee, receiving the procedure's result, and then forwarding this result back to the Caller. A component, the _Callee_, announces to the router that it provides a certain procedure, identified by a procedure name. Routed Remote Procedure Calls (RPCs) rely on the same sort of decoupling that is used by the Publish & Subscribe pattern. Another component, a _Publisher_, can then publish to this topic, and the router distributes events to all Subscribers. Publish & Subscribe (PubSub) is an established messaging pattern where a component, the _Subscriber_, informs the router that it wants to receive information on a topic (i.e., it subscribes to a topic). WAMP provides two messaging patterns: _Publish & Subscribe_ and _routed Remote Procedure Calls_. WAMP is a routed protocol, with all components connecting to a _WAMP Router_, where the WAMP Router performs message routing between the components. Among the changes was that WAMP can now run over any transport which is message-oriented, ordered, reliable, and bi-directional. Feedback from implementers and users of this was included in a second version of the protocol which this document defines. WAMP was initially defined as a WebSocket sub-protocol, which provided Publish & Subscribe (PubSub) functionality as well as Remote Procedure Calls (RPC) for procedures implemented in a WAMP router. The Web Application Messaging Protocol (WAMP) is intended to provide application developers with the semantics they need to handle messaging between components in distributed applications. It defines an API at the message level, requiring users who want to use WebSocket connections in their applications to define their own semantics on top of it. The WebSocket protocol brings bi-directional real-time connections to the browser. This Internet-Draft will expire on October 20, 2018. This document is also available in these normative formats: It is inappropriate to use Internet-Drafts as reference material or to cite them Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoletedīy other documents at any time. The list of current Internet-Drafts is at Note that other groups mayĪlso distribute working documents as Internet-Drafts. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF).
#Responsibility of router on a stick full#
This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. WAMP uses WebSocket as its default transport, but can be transmitted viaĪny other protocol that allows for ordered, reliable, bi-directional, and message-oriented communications. It is intended to connect applicationĬomponents in distributed applications. Messaging patterns: Publish & Subscribe and routed Remote Procedure Calls. WAMP is a routed protocol that provides two This document defines the Web Application Messaging Protocol (WAMP).