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Class: ActiveRecord::Middleware::DatabaseSelector::Resolver::Session

Do not use. This class is for internal use only.

Overview

The session class is used by the ::ActiveRecord::Middleware::DatabaseSelector::Resolver to save timestamps of the last write in the session.

The last_write is used to determine whether it’s safe to read from the replica or the request needs to be sent to the primary.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(session) ⇒ Session

[ GitHub ] 

  


# File 'activerecord/lib/active_record/middleware/database_selector/resolver/session.rb', line 28


def initialize(session)
  @session = session
end


  







Class Method Details



  

    .call(request)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/middleware/database_selector/resolver/session.rb', line 13


def self.call(request)
  new(request.session)
end


  








  

    .convert_time_to_timestamp(time)  
  



  

    

Converts time to a timestamp that represents milliseconds since epoch.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/middleware/database_selector/resolver/session.rb', line 19


def self.convert_time_to_timestamp(time)
  time.to_i * 1000 + time.usec / 1000
end


  








  

    .convert_timestamp_to_time(timestamp)  
  



  

    

Converts milliseconds since epoch timestamp into a time object.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/middleware/database_selector/resolver/session.rb', line 24


def self.convert_timestamp_to_time(timestamp)
  timestamp ? Time.at(timestamp / 1000, (timestamp % 1000) * 1000) : Time.at(0)
end


  







Instance Attribute Details



  

    #session   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/middleware/database_selector/resolver/session.rb', line 32


attr_reader :session


  







Instance Method Details



  

    #last_write_timestamp  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/middleware/database_selector/resolver/session.rb', line 34


def last_write_timestamp
  self.class.convert_timestamp_to_time(session[:last_write])
end


  








  

    #save(response)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/middleware/database_selector/resolver/session.rb', line 42


def save(response)
end


  








  

    #update_last_write_timestamp  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/middleware/database_selector/resolver/session.rb', line 38


def update_last_write_timestamp
  session[:last_write] = self.class.convert_time_to_timestamp(Time.now)
end