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前往新版Gitcode,体验更适合开发者的 AI 搜索 >>
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c97acbbd
编写于
6月 18, 2018
作者:
R
Rossen Stoyanchev
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Fix documentatio issue
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03c30513
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src/docs/asciidoc/web/websocket.adoc
src/docs/asciidoc/web/websocket.adoc
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src/docs/asciidoc/web/websocket.adoc
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@@ -1296,18 +1296,14 @@ See <<websocket-stomp-handle-send>>.
[[websocket-stomp-subscribe-mapping]]
==== `@SubscribeMapping`
`@SubscribeMapping` is used together with `@MessageMapping` to narrow the mapping to
subscription messages. In this scenario `@MessageMapping` expresses message destination
mappings for routing purposes, which can be done at the class or at the method level,
while `@SubscribeMapping` narrows the mapping to subscription messages only.
Methods with `@MessageMapping` and `@SubscribeMapping` support the same
<<websocket-stomp-message-mapping,method arguments>> as methods annotated only with
`@MessageMapping` do. However for the return value, in the absence of `@SendTo` and
`@SubscribeMapping` is similar to `@MessageMapping` but also narrows the mapping to
subscription messages only. Methods with `@SubscribeMapping` support the same
<<websocket-stomp-message-mapping,method arguments>> as `@MessageMapping` methods do.
The main difference is that for the return value, in the absence of `@SendTo` and
`@SendToUser`, a message is sent directly as a reply to the subscription, via the
"clientOutboundChannel" channel. Effectively
the subscription is used as a one-time,
request-reply message exchange with the subscription never stored. This is useful for
loading data on startup and for initializing a front-end UI.
"clientOutboundChannel" channel. Effectively
in this case the subscription is used as
a one-time, request-reply message exchange with the subscription never stored.
This is useful for
loading data on startup and for initializing a front-end UI.
If an `@SubscribeMapping` method is annotated with `@SendTo` and `@SendToUser` the return
value is sent to the `"brokerChannel"` as usual, sending a message subscribers of the
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