Creates a new
ConnectionPool object. spec is a ConnectionSpecification object
which describes database connection
information (e.g. adapter, host name, username, password, etc), as well as
the maximum size for this ConnectionPool.
The default ConnectionPool maximum size is 5.
# File activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb, line 67
def initialize(spec)
@spec = spec
# The cache of reserved connections mapped to threads
@reserved_connections = {}
# The mutex used to synchronize pool access
@connection_mutex = Monitor.new
@queue = @connection_mutex.new_cond
# default 5 second timeout unless on ruby 1.9
@timeout =
if RUBY_VERSION < '1.9'
spec.config[:wait_timeout] || 5
end
# default max pool size to 5
@size = (spec.config[:pool] && spec.config[:pool].to_i) || 5
@connections = []
@checked_out = []
end
