def __init__(self, build_request_handler):
"""
:type build_request_handler: BuildRequestHandler
"""
self._logger = get_logger(__name__)
self._build_request_handler = build_request_handler
self._idle_slaves = OrderedSetQueue()
self._allocation_thread = SafeThread(
target=self._slave_allocation_loop,
name='SlaveAllocationLoop',
daemon=True)
