"""
A mostly dummy class to simulate the Webware Application object.
"""

from wkcommon import NoDefault
import threading
try:
    from TaskKit.Scheduler import Scheduler
except ImportError:
    Scheduler = None

_taskManager = None
_makeTaskManagerLock = threading.Lock()

def taskManager():
    global _taskManager
    if _taskManager is None:
        if Scheduler is None:
            assert 0, (
                "FakeWebware is not installed, and/or TaskKit is "
                "not available")
        _makeTaskManagerLock.acquire()
        try:
            if _taskManager is None:
                _taskManager = Scheduler(1)
                _taskManager.start()
        finally:
            _makeTaskManagerLock.release()
    return _taskManager

class Application(object):

    def __init__(self, transaction):
        self._transaction = transaction

    def forward(self, trans, url, context=None):
        assert context is None, "Contexts are not supported"
        trans.forward(url)

    def setting(self, setting, default=NoDefault):
        assert default is not NoDefault, "No settings are defined"
        return default

    def taskManager(self):
        return taskManager()