diff options
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb')
-rw-r--r-- | activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb | 61 |
1 files changed, 32 insertions, 29 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb index cebe741daa..db80c0faee 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb @@ -58,13 +58,11 @@ module ActiveRecord # * +checkout_timeout+: number of seconds to block and wait for a connection # before giving up and raising a timeout error (default 5 seconds). # * +reaping_frequency+: frequency in seconds to periodically run the - # Reaper, which attempts to find and close dead connections, which can - # occur if a programmer forgets to close a connection at the end of a - # thread or a thread dies unexpectedly. (Default nil, which means don't - # run the Reaper). - # * +dead_connection_timeout+: number of seconds from last checkout - # after which the Reaper will consider a connection reapable. (default - # 5 seconds). + # Reaper, which attempts to find and recover connections from dead + # threads, which can occur if a programmer forgets to close a + # connection at the end of a thread or a thread dies unexpectedly. + # Regardless of this setting, the Reaper will be invoked before every + # blocking wait. (Default nil, which means don't schedule the Reaper). class ConnectionPool # Threadsafe, fair, FIFO queue. Meant to be used by ConnectionPool # with which it shares a Monitor. But could be a generic Queue. @@ -222,7 +220,7 @@ module ActiveRecord include MonitorMixin - attr_accessor :automatic_reconnect, :checkout_timeout, :dead_connection_timeout + attr_accessor :automatic_reconnect, :checkout_timeout attr_reader :spec, :connections, :size, :reaper # Creates a new ConnectionPool object. +spec+ is a ConnectionSpecification @@ -237,7 +235,6 @@ module ActiveRecord @spec = spec @checkout_timeout = spec.config[:checkout_timeout] || 5 - @dead_connection_timeout = spec.config[:dead_connection_timeout] || 5 @reaper = Reaper.new self, spec.config[:reaping_frequency] @reaper.run @@ -361,11 +358,13 @@ module ActiveRecord # calling +checkout+ on this pool. def checkin(conn) synchronize do + owner = conn.owner + conn.run_callbacks :checkin do conn.expire end - release conn + release conn, owner @available.add conn end @@ -378,22 +377,28 @@ module ActiveRecord @connections.delete conn @available.delete conn - # FIXME: we might want to store the key on the connection so that removing - # from the reserved hash will be a little easier. - release conn + release conn, conn.owner @available.add checkout_new_connection if @available.any_waiting? end end - # Removes dead connections from the pool. A dead connection can occur - # if a programmer forgets to close a connection at the end of a thread + # Recover lost connections for the pool. A lost connection can occur if + # a programmer forgets to checkin a connection at the end of a thread # or a thread dies unexpectedly. def reap - synchronize do - stale = Time.now - @dead_connection_timeout - connections.dup.each do |conn| - if conn.in_use? && stale > conn.last_use && !conn.active? + stale_connections = synchronize do + @connections.select do |conn| + conn.in_use? && !conn.owner.alive? + end + end + + stale_connections.each do |conn| + synchronize do + if conn.active? + conn.reset! + checkin conn + else remove conn end end @@ -415,20 +420,15 @@ module ActiveRecord elsif @connections.size < @size checkout_new_connection else + reap @available.poll(@checkout_timeout) end end - def release(conn) - thread_id = if @reserved_connections[current_connection_id] == conn - current_connection_id - else - @reserved_connections.keys.find { |k| - @reserved_connections[k] == conn - } - end + def release(conn, owner) + thread_id = owner.object_id - @reserved_connections.delete thread_id if thread_id + @reserved_connections.delete thread_id end def new_connection @@ -538,7 +538,10 @@ module ActiveRecord # for (not necessarily the current class). def retrieve_connection(klass) #:nodoc: pool = retrieve_connection_pool(klass) - (pool && pool.connection) or raise ConnectionNotEstablished + raise ConnectionNotEstablished, "No connection pool for #{klass}" unless pool + conn = pool.connection + raise ConnectionNotEstablished, "No connection for #{klass} in connection pool" unless conn + conn end # Returns true if a connection that's accessible to this class has |