Module: SlavePoolsModule::QueryCacheCompat

Included in:
ConnectionProxy
Defined in:
lib/slave_pools/query_cache_compat.rb

Overview

Implements the methods expected by the QueryCache module

Instance Method Summary collapse

Instance Method Details

#delete(*a, &b) ⇒ Object 



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# File 'lib/slave_pools/query_cache_compat.rb', line 28

def delete(*a, &b)
  @master.connection.clear_query_cache if query_cache_enabled
  send_to_master(:delete, *a, &b)
end

#insert(*a, &b) ⇒ Object 



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# File 'lib/slave_pools/query_cache_compat.rb', line 18

def insert(*a, &b)
  @master.connection.clear_query_cache if query_cache_enabled
  send_to_master(:insert, *a, &b)
end

#query_cache_enabled ⇒ Object

Rails 3.2 changed query cacheing a little and affected slave_pools like this:

* ActiveRecord::Base.cache sets @query_cache_enabled for current connection
* ActiveRecord::QueryCache middleware (in call()) that Rails uses sets
  @query_cache_enabled directly on ActiveRecord::Base.connection
  (which could be master at that point)

:‘( So, let’s just use the master connection for all query cacheing.



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# File 'lib/slave_pools/query_cache_compat.rb', line 41

def query_cache_enabled
  @master.connection.query_cache_enabled
end

#select_all(*a, &b) ⇒ Object 



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# File 'lib/slave_pools/query_cache_compat.rb', line 5

def select_all(*a, &b)
  arel, name, binds = a
  if query_cache_enabled && !locked?(arel)
    # FIXME this still hits the +select_all+ method in AR connection's
    # query_cache.rb. It'd be nice if we could avoid it somehow so
    # +select_all+ and then +to_sql+ aren't called redundantly.
    sql = to_sql(arel, binds)
    @master.connection.send(:cache_sql, sql, binds) {send_to_current(:select_all, *[sql, name, binds], &b)}
  else
    send_to_current(:select_all, *a, &b)
  end
end

#update(*a, &b) ⇒ Object 



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# File 'lib/slave_pools/query_cache_compat.rb', line 23

def update(*a, &b)
  @master.connection.clear_query_cache if query_cache_enabled
  send_to_master(:update, *a, &b)
end