Class: Cosmos::TimelineManager

Inherits:
Object
  • Object
show all
Defined in:
lib/cosmos/microservices/timeline_microservice.rb

Overview

The timeline manager starts a thread pool and looks at the schedule and if an “activity” should be run. TimelineManager adds the “activity” to the thread pool and the thread will execute the “activity”.

Instance Method Summary collapse

Constructor Details

#initialize(name:, scope:, schedule:) ⇒ TimelineManager

Returns a new instance of TimelineManager.



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 174

def initialize(name:, scope:, schedule:)
  @timeline_name = name
  @scope = scope
  @schedule = schedule
  @worker_count = 3
  @queue = Queue.new
  @thread_pool = generate_thread_pool()
  @cancel_thread = false
  @expire = 0
end

Instance Method Details

#add_expire_activity ⇒ Object

Add task to remove events older than 7 time



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 219

def add_expire_activity
  now = Time.now.to_i
  @expire = now + 3_000
  activity = ActivityModel.new(
    name: @timeline_name,
    scope: @scope,
    start: (now - 86_400 * 7),
    stop: (now - 82_800 * 7),
    kind: 'EXPIRE',
    data: {}
  )
  @queue << activity
  return activity
end

#generate_thread_pool ⇒ Object 



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 185

def generate_thread_pool
  thread_pool = []
  @worker_count.times {
    worker = TimelineWorker.new(name: @timeline_name, scope: @scope, queue: @queue)
    thread_pool << Thread.new { worker.run }
  }
  return thread_pool
end

#request_update(start:) ⇒ Object

This can feedback to ensure the schedule will not run out so this should fire once an hour to make sure the TimelineMicroservice will collect the next hour and update the schedule.



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 237

def request_update(start:)
  notification = {
    'data' => JSON.generate({ 'time' => start }),
    'kind' => 'refresh',
    'type' => 'timeline',
    'timeline' => @timeline_name
  }
  begin
    TimelineTopic.write_activity(notification, scope: @scope)
  rescue StandardError
    Logger.error "#{@name} manager failed to request update"
  end
end

#run ⇒ Object 



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 194

def run
  Logger.info "#{@timeline_name} timeline manager running"
  loop do
    start = Time.now.to_i
    @schedule.activities.each do |activity|
      start_difference = activity.start - start
      if start_difference <= 0 && @schedule.not_queued?(activity.start)
        Logger.debug "#{@timeline_name} #{@scope} current start: #{start}, vs #{activity.start}, #{start_difference}"
        activity.add_event(status: 'queued')
        @queue << activity
      end
    end
    if start >= @expire
      add_expire_activity()
      request_update(start: start)
    end
    break if @cancel_thread

    sleep(1)
    break if @cancel_thread
  end
  Logger.info "#{@timeline_name} timeine manager exiting"
end

#shutdown ⇒ Object 



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# File 'lib/cosmos/microservices/timeline_microservice.rb', line 251

def shutdown
  @cancel_thread = true
  @worker_count.times {
    @queue << nil
  }
end