31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
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title = "FanOut (multiplying messages)"
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description = "FanOut is a component that receives messages from the subscriber and passes them to all publishers."
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date = 2024-10-09T02:47:30+01:00
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weight = -50
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draft = false
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bref = "FanOut is a component that receives messages from the subscriber and passes them to all publishers."
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## FanOut component
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FanOut is a component that receives messages from a topic and passes them to all subscribers. In effect, messages are "multiplied".
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A typical use case for using FanOut is having one external subscription and multiple workers
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inside the process.
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### Configuring
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{{% load-snippet-partial file="src-link/pubsub/gochannel/fanout.go" first_line_contains="// NewFanOut" last_line_contains=")" padding_after="0" %}}
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You need to call AddSubscription method for all topics that you want to listen to.
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This needs to be done *before* starting the FanOut.
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{{% load-snippet-partial file="src-link/pubsub/gochannel/fanout.go" first_line_contains="// AddSubscription" last_line_contains=")" padding_after="0" %}}
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### Running
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{{% load-snippet-partial file="src-link/pubsub/gochannel/fanout.go" first_line_contains="// Run" last_line_contains=")" padding_after="0" %}}
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Then, use it as any other `message.Subscriber`.
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