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Replay events
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class ReplayTest | |
include Replay::EventSource | |
#define an event inline to the class | |
event SomethingHappened(name: String, pid: Integer) | |
apply SomethingHappened do |event| | |
@name = event.name | |
@pid = event.pid | |
end | |
apply SomethingElseHappened do |event| | |
@state = :happened_again | |
@pid = nil if event.pid == @pid | |
end | |
def do_something(valid_parameter = false) | |
#the command validates inputs | |
raise InvalidCommand.new("parameters were invalid") unless valid_parameter | |
#publish events | |
unless @pid | |
signal SomethingHappened.new(:name = "foo", :pid => 123) | |
else | |
signal SomethingElseHappened.new(:pid => 123) | |
end | |
end | |
end |
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#define an event outside the class | |
class ReplayTest::SomethingElseHappened | |
include Replay::Event | |
attribute :pid, Integer | |
end |
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#freehanding this, forgive the lack of organization | |
class MyEventStream | |
include Replay::StreamWithStorage | |
event_store MyEventStore | |
end | |
class MyEventStore | |
include Replay::EventStore | |
def self.load(new_obj, guid, options = {}) | |
if options[:rebuild] | |
events = events_for_guid(guid) | |
else | |
#this is just the skeleton of this operation, needs work | |
obj = JSON.load(snapshot_json_for(guid)) | |
obj.event_stream = new_obj.event_stream | |
events = events_for_guid(guid, :since => obj.version) | |
end | |
events = events_for_guid(guid) | |
events.each{|e| new_obj.apply(e)} | |
return new_obj | |
end | |
end | |
#there will probably be a convenience method for this. maybe. | |
baby_object = ReplayTest.new(MyEventStream) | |
#loading an event—rebuild defaults to false | |
root = MyEventStore.load(baby_object, guid, :rebuild => true) |
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