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 true if there are any active connections among the connection pools that the ConnectionHandler is managing.
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 375 def active_connections? connection_pools.values.any? { |pool| pool.active_connection? } end
Returns any connections in use by the current thread back to the pool.
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 380 def clear_active_connections! @connection_pools.each_value {|pool| pool.release_connection } end
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 389 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 385 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 409 def connected?(klass) conn = retrieve_connection_pool(klass) conn && conn.connected? end
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 368 def establish_connection(name, spec) @connection_pools[spec] ||= ConnectionAdapters::ConnectionPool.new(spec) @class_to_pool[name] = @connection_pools[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 418 def remove_connection(klass) pool = @class_to_pool.delete(klass.name) return nil unless pool @connection_pools.delete pool.spec pool.automatic_reconnect = false pool.disconnect! pool.spec.config end
# File lib/active_record/connection_adapters/abstract/connection_pool.rb, line 428 def retrieve_connection_pool(klass) pool = @class_to_pool[klass.name] return pool if pool return nil if ActiveRecord::Base == klass retrieve_connection_pool klass.superclass end
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