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Versions: 18
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Contents
# Allows arbitrary wrapping of the job deserialization and job execution procedures
class Sqewer::MiddlewareStack
# Returns the default middleware stack, which is empty (an instance of None).
#
# @return [MiddlewareStack] the default empty stack
def self.default
@instance ||= new
end
# Creates a new MiddlewareStack. Once created, handlers can be added using `:<<`
def initialize
@handlers = []
end
# Adds a handler. The handler should respond to :around_deserialization and #around_execution.
#
# @param handler[#around_deserializarion, #around_execution] The middleware item to insert
# @return [void]
def <<(handler)
@handlers << handler
# TODO: cache the wrapping proc
end
def around_execution(job, context, &inner_block)
return yield if @handlers.empty?
responders = @handlers.select{|e| e.respond_to?(:around_execution) }
responders.reverse.inject(inner_block) {|outer_block, middleware_object|
->{
middleware_object.public_send(:around_execution, job, context, &outer_block)
}
}.call
end
def around_deserialization(serializer, message_id, message_body, &inner_block)
return yield if @handlers.empty?
responders = @handlers.select{|e| e.respond_to?(:around_deserialization) }
responders.reverse.inject(inner_block) {|outer_block, middleware_object|
->{ middleware_object.public_send(:around_deserialization, serializer, message_id, message_body, &outer_block) }
}.call
end
end
Version data entries
18 entries across 18 versions & 1 rubygems