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#
# (C) Copyright IBM Corp. 2017
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import os
import os.path
import time
from config import *
from toree_manager import *
class LifecycleManager:
configManager = None
toreeManager = None
def __init__(self):
self.configManager = ConfigManager()
self.toreeManager = ToreeManager()
def _reserve_profile(self):
"""
Tries to reserv a profile configuration to access Toree
:return: the reserved profile folder location, or None
"""
profilesFolder = self.configManager.getProfilesFolder()
profile = None
"""Lock mutext to avoid two processes to select same kernel config"""
# mutex = open(self.configManager.getProfilesFolder() + "/mutex")
# lock = fcntl.flock(mutex, fcntl.LOCK_EX)
# print(lock)
"""Select from the available kernel configurations"""
for (path, dirs, files) in os.walk(profilesFolder):
for folderName in dirs:
profile = Profile(profilesFolder + '/' + folderName)
if profile.isAvailable():
profile.reserve()
break
"""Unlock the mutex enabling other processes to select same kernel config"""
# fcntl.flock(self.mutex, fcntl.LOCK_UN)
return profile
def _release_profile(self, profile):
profile.release()
def start_toree(self):
"""
Reserve a profile to use, and start a remote Toree instance with that configuration
:return: the path to the configuration file (profile.json) to use when connecting
"""
profile = self._reserve_profile()
if profile is None:
raise RuntimeError('No server resources available.')
self.toreeManager.start_toree(profile)
return profile
def stop_toree(self, profile):
self.toreeManager.stop_toree(profile)
self._release_profile(profile)
"""
manager = LifecycleManager()
print('Starting first toree kernel')
p1 = manager.start_toree()
print(p1.profilePath)
print('Starting second toree kernel')
time.sleep(15)
#p2 = manager.start_toree()
#print p2.profilePath
#print'Stopping toree kernels'
manager.stop_toree(p1)
#manager.stop_toree(p2)
print('finished')
"""
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