root / lib / jqueue.py @ c6d58a2b
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Module implementing the job queue handling."""
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import threading |
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import Queue |
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from ganeti import opcodes |
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from ganeti import errors |
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class JobObject: |
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"""In-memory job representation.
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This is what we use to track the user-submitted jobs (which are of
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class opcodes.Job).
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"""
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def __init__(self, jid, jdesc): |
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self.data = jdesc
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jdesc.status = opcodes.Job.STATUS_PENDING |
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jdesc.job_id = jid |
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jdesc.op_status = [opcodes.Job.STATUS_PENDING for i in jdesc.op_list] |
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jdesc.op_result = [None for i in jdesc.op_list] |
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self.lock = threading.Lock()
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def SetStatus(self, status, result=None): |
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self.lock.acquire()
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self.data.status = status
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if result is not None: |
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self.data.result = result
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self.lock.release()
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def GetData(self): |
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self.lock.acquire()
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#FIXME(iustin): make a deep copy of result
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result = self.data
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self.lock.release()
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return result
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class QueueManager: |
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"""Example queue implementation.
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"""
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def __init__(self): |
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self.job_queue = {}
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self.jid = 1 |
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self.lock = threading.Lock()
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self.new_queue = Queue.Queue()
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def put(self, item): |
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"""Add a new job to the queue.
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This enters the job into our job queue and also puts it on the new
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queue, in order for it to be picked up by the queue processors.
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"""
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self.lock.acquire()
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try:
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rid = self.jid
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self.jid += 1 |
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job = JobObject(rid, item) |
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self.job_queue[rid] = job
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finally:
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self.lock.release()
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self.new_queue.put(job)
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return rid
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def query(self, rid): |
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"""Query a given job ID.
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"""
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self.lock.acquire()
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result = self.job_queue.get(rid, None) |
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self.lock.release()
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return result
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def query_jobs(self, fields, names): |
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"""Query all jobs.
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The fields and names parameters are similar to the ones passed to
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the OpQueryInstances.
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"""
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result = [] |
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self.lock.acquire()
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if names:
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values = [self.job_queue[j_id] for j_id in names] |
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else:
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values = self.job_queue.itervalues()
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try:
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for jobj in values: |
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row = [] |
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jdata = jobj.data |
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for fname in fields: |
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if fname == "id": |
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row.append(jdata.job_id) |
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elif fname == "status": |
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row.append(jdata.status) |
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elif fname == "op_list": |
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row.append([op.__getstate__() for op in jdata.op_list]) |
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elif fname == "op_status": |
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row.append(jdata.op_status) |
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elif fname == "op_result": |
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row.append(jdata.op_result) |
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else:
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raise errors.OpExecError("Invalid job query field '%s'" % |
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fname) |
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result.append(row) |
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finally:
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self.lock.release()
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return result
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