Class: ConfigCat::AutoPollingCachePolicy

Inherits:
CachePolicy show all
Defined in:
lib/configcat/autopollingcachepolicy.rb

Instance Method Summary collapse

Constructor Details

#initialize(config_fetcher, config_cache, cache_key, poll_interval_seconds = 60, max_init_wait_time_seconds = 5, on_configuration_changed_callback = nil) ⇒ AutoPollingCachePolicy

Returns a new instance of AutoPollingCachePolicy.



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# File 'lib/configcat/autopollingcachepolicy.rb', line 7

def initialize(config_fetcher, config_cache, cache_key, poll_interval_seconds=60, max_init_wait_time_seconds=5, on_configuration_changed_callback=nil)
  if poll_interval_seconds < 1
    poll_interval_seconds = 1
  end
  if max_init_wait_time_seconds < 0
    max_init_wait_time_seconds = 0
  end
  @_config_fetcher = config_fetcher
  @_config_cache = config_cache
  @_cache_key = cache_key
  @_poll_interval_seconds = poll_interval_seconds
  @_max_init_wait_time_seconds = max_init_wait_time_seconds
  @_on_configuration_changed_callback = on_configuration_changed_callback
  @_initialized = false
  @_is_running = false
  @_start_time = Time.now.utc
  @_lock = Concurrent::ReadWriteLock.new()
  @_is_started = Concurrent::Event.new()
  @thread = Thread.new{_run()}
  @_is_started.wait()
end

Instance Method Details

#_run ⇒ Object 



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# File 'lib/configcat/autopollingcachepolicy.rb', line 29

def _run()
  @_is_running = true
  @_is_started.set()
  loop do
    force_refresh()
    sleep(@_poll_interval_seconds)
    break if !@_is_running
  end
end

#force_refresh ⇒ Object 



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# File 'lib/configcat/autopollingcachepolicy.rb', line 51

def force_refresh()
  begin
    configuration_response = @_config_fetcher.get_configuration_json()

    begin
      @_lock.acquire_read_lock()
      old_configuration = @_config_cache.get(@_cache_key)
    ensure
      @_lock.release_read_lock()
    end

    if configuration_response.is_fetched()
      configuration = configuration_response.json()
      if configuration != old_configuration
        begin
          @_lock.acquire_write_lock()
          @_config_cache.set(@_cache_key, configuration)
          @_initialized = true
        ensure
          @_lock.release_write_lock()
        end
        begin
          if !@_on_configuration_changed_callback.equal?(nil)
            @_on_configuration_changed_callback.()
          end
        rescue Exception => e
          ConfigCat.logger.error("Exception in on_configuration_changed_callback: #{e.class}:'#{e}'")
        end
      end
    end

    if !@_initialized && !old_configuration.equal?(nil)
      @_initialized = true
    end
  rescue Timeout::Error => e
    ConfigCat.logger.error("Request timed out. Timeout values: [open: %ss, read: %ss]" %
                           [@_config_fetcher.get_open_timeout(), @_config_fetcher.get_read_timeout()])
  rescue Exception => e
    ConfigCat.logger.error("Double-check your SDK Key at https://app.configcat.com/sdkkey.")
    ConfigCat.logger.error "threw exception #{e.class}:'#{e}'"
    ConfigCat.logger.error "stacktrace: #{e.backtrace}"
  end
end

#get ⇒ Object 



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# File 'lib/configcat/autopollingcachepolicy.rb', line 39

def get()
  while !@_initialized && (Time.now.utc < @_start_time + @_max_init_wait_time_seconds)
    sleep(0.5)
  end
  begin
    @_lock.acquire_read_lock()
    return @_config_cache.get(@_cache_key)
  ensure
    @_lock.release_read_lock()
  end
end

#stop ⇒ Object 



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# File 'lib/configcat/autopollingcachepolicy.rb', line 95

def stop()
  @_is_running = false
end