Class: Wye::ActiveRecord::ConnectionHandler

Inherits:
ActiveRecord::ConnectionAdapters::ConnectionHandler
  • Object
show all
Defined in:
lib/wye/active_record/connection_handler.rb

Overview

Implements an identical interface to the standard AR connection handler, but with support for alternate connection pools for each spec.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*arguments) ⇒ ConnectionHandler

Returns a new instance of ConnectionHandler.



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# File 'lib/wye/active_record/connection_handler.rb', line 12

def initialize(*arguments)
  super
  @class_to_alternate_pools = {}
  @switch = Switch.new(::ActiveRecord::Base)
end

Instance Attribute Details

#connection_pools ⇒ Object (readonly)

Returns the value of attribute connection_pools.



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# File 'lib/wye/active_record/connection_handler.rb', line 9

def connection_pools
  @connection_pools
end

#switch ⇒ Object (readonly)

Returns the value of attribute switch.



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# File 'lib/wye/active_record/connection_handler.rb', line 10

def switch
  @switch
end

Instance Method Details

#alternates ⇒ Object 



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# File 'lib/wye/active_record/connection_handler.rb', line 18

def alternates
  @class_to_alternate_pools.map { |(klass,atp)| atp.map(&:first) }.flatten.uniq
end

#distributor(type) ⇒ Object 



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# File 'lib/wye/active_record/connection_handler.rb', line 22

def distributor(type)
  Distributor.new(type, alternates << nil)
end

#establish_connection(name, spec) ⇒ Object 



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# File 'lib/wye/active_record/connection_handler.rb', line 26

def establish_connection(name, spec)
  super.tap do
    @class_to_alternate_pools[name] ||= {}

    alternate_specs(spec).each do |alternate,spec|
      @connection_pools[spec] ||= ::ActiveRecord::ConnectionAdapters::ConnectionPool.new(spec)
      @class_to_alternate_pools[name][alternate.to_sym] = @connection_pools[spec]
    end
  end
end

#remove_connection(klass) ⇒ Object 



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# File 'lib/wye/active_record/connection_handler.rb', line 37

def remove_connection(klass)
  super.tap do
    if pools = @class_to_alternate_pools.delete(klass.name)
      pools.each do |(alternate,pool)|
        @connection_pools.delete pool.spec
        pool.automatic_reconnect = false
        pool.disconnect!
      end
    end
  end
end

#retrieve_alternate_connection_pool(klass, alternate) ⇒ Object 



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# File 'lib/wye/active_record/connection_handler.rb', line 49

def retrieve_alternate_connection_pool(klass, alternate)
  pools = @class_to_alternate_pools[klass.name]
  return pools[alternate] if pools && pools.include?(alternate)
  return nil if ::ActiveRecord::Base == klass
  retrieve_alternate_connection_pool(klass.superclass, alternate)
end

#retrieve_connection_pool(klass) ⇒ Object 



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# File 'lib/wye/active_record/connection_handler.rb', line 63

def retrieve_connection_pool(klass)
  if alternate = switch.current_alternate(klass)
    retrieve_alternate_connection_pool(klass, alternate)
  else
    retrieve_main_connection_pool(klass)
  end
end

#retrieve_main_connection_pool(klass) ⇒ Object 



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# File 'lib/wye/active_record/connection_handler.rb', line 56

def retrieve_main_connection_pool(klass)
  pool = @class_to_pool[klass.name]
  return pool if pool
  return nil if ::ActiveRecord::Base == klass
  retrieve_main_connection_pool(klass.superclass)
end