Class: NtiEventBus::HandlerBase

Inherits:
Object
  • Object
show all
Defined in:
lib/nti_event_bus/handler_base.rb

Overview

Base class for all event handlers.

A handler lives inside the subscribing module and is responsible for:

1. Extracting what it needs from the raw event payload
2. Doing any lookups / transformations
3. Calling the module's Main interactor (or service) with normalized params

Subclasses must implement #call.

Example:

class CreateAuditLog::Handlers::OrderVoided < NtiEventBus::HandlerBase
def call
  CreateAuditLog::Main.call(
    cashier_id: payload.fetch(:cashier_id),
    ...
  )
end
end

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(payload) ⇒ HandlerBase

Returns a new instance of HandlerBase.



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# File 'lib/nti_event_bus/handler_base.rb', line 27

def initialize(payload)
  @payload = payload.with_indifferent_access.freeze
end

Instance Attribute Details

#payload ⇒ Object (readonly)

Returns the value of attribute payload.



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# File 'lib/nti_event_bus/handler_base.rb', line 25

def payload
  @payload
end

Instance Method Details

#call ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/nti_event_bus/handler_base.rb', line 31

def call
  raise NotImplementedError, "#{self.class}#call must be implemented"
end