116 lines
2.4 KiB
Ruby
116 lines
2.4 KiB
Ruby
module RedStorm
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class SimpleSpout
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# DSL class methods
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def self.output_fields(*fields)
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@fields = fields.map(&:to_s)
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end
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def self.on_next_tuple(*args, &next_tuple_block)
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options = args.last.is_a?(Hash) ? args.pop : {}
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method_name = args.first
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self.execute_options.merge!(options)
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@next_tuple_block = block_given? ? next_tuple_block : lambda {self.send(method_name)}
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end
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def self.on_init(method_name = nil, &init_block)
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@init_block = block_given? ? init_block : lambda {self.send(method_name)}
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end
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def self.on_ack(method_name = nil, &ack_block)
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@ack_block = block_given? ? ack_block : lambda {|msg_id| self.send(method_name, msg_id)}
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end
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def self.on_fail(method_name = nil, &fail_block)
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@fail_block = block_given? ? fail_block : lambda {|msg_id| self.send(method_name, msg_id)}
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end
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def self.set(options = {})
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self.spout_options.merge!(options)
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end
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def emit(*values)
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@collector.emit(Values.new(*values))
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end
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# Spout interface
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def next_tuple
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output = instance_exec(&self.class.next_tuple_block)
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if self.class.emit?
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if output
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values = [output].flatten
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@collector.emit(Values.new(*values))
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else
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sleep(0.1)
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end
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end
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end
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def open(config, context, collector)
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@collector = collector
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@context = context
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@config = config
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instance_exec(&self.class.init_block)
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end
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def declare_output_fields(declarer)
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declarer.declare(Fields.new(self.class.fields))
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end
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def is_distributed
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self.class.is_distributed?
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end
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def ack(msg_id)
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instance_exec(msg_id, &self.class.ack_block)
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end
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def fail(msg_id)
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instance_exec(msg_id, &self.class.fail_block)
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end
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private
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def self.fields
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@fields
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end
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def self.next_tuple_block
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@next_tuple_block ||= lambda {}
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end
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def self.init_block
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@init_block ||= lambda {}
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end
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def self.ack_block
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@ack_block ||= lambda {}
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end
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def self.fail_block
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@fail_block ||= lambda {}
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end
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def self.execute_options
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@execute_options ||= {:emit => true}
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end
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def self.spout_options
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@spout_options ||= {:is_distributed => false}
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end
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def self.is_distributed?
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!!self.spout_options[:is_distributed]
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end
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def self.emit?
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!!self.execute_options[:emit]
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end
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end
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end
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