Object
ConnectionHandler is a collection of ConnectionPool objects. It is used for keeping separate connection pools for Active Record models that connect to different databases.
For example, suppose that you have 5 models, with the following hierarchy:
| +-- Book | | | +-- ScaryBook | +-- GoodBook +-- Author +-- BankAccount
Suppose that Book is to connect to a separate database (i.e. one other than the default database). Then Book, ScaryBook and GoodBook will all use the same connection pool. Likewise, Author and BankAccount will use the same connection pool. However, the connection pool used by Author/BankAccount is not the same as the one used by Book/ScaryBook/GoodBook.
Normally there is only a single ConnectionHandler instance, accessible via ActiveRecord::Base.connection_handler. Active Record models use this to determine that connection pool that they should use.
Returns any connections in use by the current thread back to the pool, and also returns connections to the pool cached by threads that are no longer alive.
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 293 def clear_active_connections! @connection_pools.each_value {|pool| pool.release_connection } end
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 302 def clear_all_connections! @connection_pools.each_value {|pool| pool.disconnect! } end
Clears the cache which maps classes
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 298 def clear_reloadable_connections! @connection_pools.each_value {|pool| pool.clear_reloadable_connections! } end
Returns true if a connection that’s accessible to this class has already been opened.
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 322 def connected?(klass) conn = retrieve_connection_pool(klass) conn && conn.connected? end
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 286 def establish_connection(name, spec) @connection_pools[name] = ConnectionAdapters::ConnectionPool.new(spec) end
Remove the connection for this class. This will close the active connection and the defined connection (if they exist). The result can be used as an argument for establish_connection, for easily re-establishing the connection.
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 331 def remove_connection(klass) pool = @connection_pools[klass.name] return nil unless pool @connection_pools.delete_if { |key, value| value == pool } pool.disconnect! pool.spec.config end
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 340 def retrieve_connection_pool(klass) pool = @connection_pools[klass.name] return pool if pool return nil if ActiveRecord::Base == klass retrieve_connection_pool klass.superclass end
Generated with the Darkfish Rdoc Generator 2.