Class: XBar::ScopeProxy

Inherits:
Object
  • Object
show all
Defined in:
lib/xbar/scope_proxy.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(shard, klass) ⇒ ScopeProxy

Returns a new instance of ScopeProxy.



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# File 'lib/xbar/scope_proxy.rb', line 4

def initialize(shard, klass)
  @shard = shard
  @klass = klass
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object 



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# File 'lib/xbar/scope_proxy.rb', line 29

def method_missing(method, *args, &block)

  @klass.connection.current_model = @klass # XXX
  if XBar.debug
    # puts "Connection proxy klass proxy is #{@klass.connection.class.name}"
    # puts "Scope proxy assigned current_model #{@klass.name}"
    # puts "Block given is #{block_given?}"
  end
  @klass.connection.run_queries_on_shard(@shard, true) do
    #puts "ScopeProxy, method missing, sending query to shard: #{@shard}, klass is #{@klass}"
    #puts "ScropeProxy, has response: method = #{method.to_s}, #{@klass.respond_to? method}"
    # puts Thread.current.backtrace
    #puts "ScopeProxy, connection class = #{@klass.connection.class.name}"
    
    @klass = @klass.send(method, *args, &block)
    #puts "After invocation..."
  end

  return @klass if @klass.is_a?(ActiveRecord::Base) or @klass.is_a?(Array) or @klass.is_a?(Fixnum) or @klass.nil?
  return self
end

Instance Attribute Details

#klass ⇒ Object

Returns the value of attribute klass.



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# File 'lib/xbar/scope_proxy.rb', line 2

def klass
  @klass
end

#shard ⇒ Object

Returns the value of attribute shard.



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# File 'lib/xbar/scope_proxy.rb', line 2

def shard
  @shard
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/xbar/scope_proxy.rb', line 51

def ==(other)
  @shard == other.shard
  @klass == other.klass
end

#connection ⇒ Object 



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# File 'lib/xbar/scope_proxy.rb', line 24

def connection
  @klass.connection.current_shard = @shard
  @klass.connection
end

#transaction(options = {}, &block) ⇒ Object

Transaction Method send all queries to a specified shard.



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# File 'lib/xbar/scope_proxy.rb', line 18

def transaction(options = {}, &block)
  @klass.connection.run_queries_on_shard(@shard) do
    @klass = @klass.connection.transaction(options, &block)
  end
end

#using(shard) ⇒ Object 



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# File 'lib/xbar/scope_proxy.rb', line 9

def using(shard)
  unless @klass.connection.shards[shard]
    raise "Nonexistent Shard Name: #{shard}"
  end 
  @shard = shard
  return self
end