Re: [amqp] Addressing Model Blog Post

This morning I don’t like “area” anymore, either. Scope is good.

(Oh how I hate naming things)

Von: Alan Conway <aconway@redhat.com>
Gesendet: Donnerstag, November 8, 2018 12:36 AM
An: Clemens Vasters
Cc: Rob Godfrey; oasis-amqp-list
Betreff: Re: [amqp] Addressing Model Blog Post

On Wed, Nov 7, 2018 at 6:59 AM Clemens Vasters <clemensv@microsoft.com> wrote:

AMQP nodes and containers are introduced in the core AMQP specification. This specification introduces a further concept: areas.

An area identifier is a string that follows DNS naming conventions. Area expressions are matching conditions that can be evaluated against area identifiers for routing or filtering.

Area identifiers are used for routing messages or links across AMQP container boundaries, potentially with one or more containers acting as routing intermediaries. Instead of having to handle container-ids for all potential routing targets, routing intermediaries can evaluate area expressions to determine which container to direct the message to.

An area identifier is a structured name that represents a logical routing target or source scope. The term area reflects that the addressed scope has further internal structure in form of nodes, and therefore an area never identifies a singular, specific target or source.

While area identifiers follow DNS naming conventions, but they do not have to be registered in DNS and they don’t have an associated IP address. They are just names describing logical scopes in a system, and the DNS-like structure helps expressing hierarchical relationships, structuring routing scopes from very broad to more scoped areas.

While the identifier of a container MUST be unique and stable within an AMQP network, areas are more flexible. A container MAY have any number of associated area aliases. Reversely, an area alias MAY be associated with several containers.

How about "scope identifier"? "area" doesn't really give me the idea of a namespace or name domain, and you used "scope" 5 times while explaining what "area" means.

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