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# frozen-string-literal: true
# This is the fastest connection pool, since it isn't a connection pool at all.
# It is just a wrapper around a single connection that uses the connection pool
# API.
class Sequel::SingleConnectionPool < Sequel::ConnectionPool
# Yield the connection if one has been made.
def all_connections
yield @conn if @conn
end
# Disconnect the connection from the database.
def disconnect(opts=nil)
return unless @conn
disconnect_connection(@conn)
@conn = nil
end
# Yield the connection to the block.
def hold(server=nil)
begin
yield(@conn ||= make_new(DEFAULT_SERVER))
rescue Sequel::DatabaseDisconnectError, *@error_classes => e
disconnect if disconnect_error?(e)
raise
end
end
# The SingleConnectionPool always has a maximum size of 1.
def max_size
1
end
def pool_type
:single
end
# The SingleConnectionPool always has a size of 1 if connected
# and 0 if not.
def size
@conn ? 1 : 0
end
private
# Make sure there is a valid connection.
def preconnect(concurrent = nil)
hold{}
end
CONNECTION_POOL_MAP[[true, false]] = self
end
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