# Copyright (c) 2005-2006, Bob Ippolito
# Copyright (c) 2007, Linden Research, Inc.
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import sys
import select
import errno
import time

from eventlib.hubs import hub


class Hub(hub.BaseHub):
    def wait(self, seconds=None):
        readers = self.readers
        writers = self.writers
        excs = self.excs
        if not readers and not writers and not excs:
            if seconds:
                time.sleep(seconds)
            return
        try:
            r, w, ig = select.select(readers.keys(), writers.keys(), [], seconds)
        except select.error, e:
            if e.args[0] == errno.EINTR:
                return
            raise
        SYSTEM_EXCEPTIONS = self.SYSTEM_EXCEPTIONS
        for observed, events in ((readers, r), (writers, w)):
            #print "events", r, " ", w
            for fileno in events:
                try:
                    cb = observed.get(fileno)
                    #print "cb", cb, " ", observed
                    if cb is not None:
                        cb(fileno)
                except SYSTEM_EXCEPTIONS:
                    raise
                except:
                    self.squelch_exception(fileno, sys.exc_info())