Package Products :: Package ZenUtils :: Module ZeoPoolBase
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Source Code for Module Products.ZenUtils.ZeoPoolBase

  1  ########################################################################### 
  2  # 
  3  # This program is part of Zenoss Core, an open source monitoring platform. 
  4  # Copyright (C) 2007, Zenoss Inc. 
  5  # 
  6  # This program is free software; you can redistribute it and/or modify it 
  7  # under the terms of the GNU General Public License version 2 or (at your 
  8  # option) any later version as published by the Free Software Foundation. 
  9  # 
 10  # For complete information please visit: http://www.zenoss.com/oss/ 
 11  # 
 12  ########################################################################### 
 13   
 14  __doc__="""ZeoPoolBase 
 15   
 16  $Id: ZC.py,v 1.9 2004/02/16 17:19:31 edahl Exp $""" 
 17   
 18  __version__ = "$Revision: 1.9 $"[11:-2] 
 19   
 20  from threading import Lock 
 21   
 22  from ZEO import ClientStorage 
 23  from ZODB import DB 
 24  from ZPublisher.HTTPRequest import HTTPRequest 
 25  from ZPublisher.HTTPResponse import HTTPResponse 
 26  from ZPublisher.BaseRequest import RequestContainer 
 27   
 28  from ZenDaemon import ZenDaemon 
 29   
 30  from Products.ZenUtils.Utils import unused 
 31   
32 -class ZeoPoolBase(ZenDaemon):
33 """ 34 A multi-threaded daemon that maintains a pool of zeo connections 35 that it can hand out to its worker threads. 36 """ 37 38
39 - def __init__(self, noopts=0, app=None, keeproot=False):
40 ZenDaemon.__init__(self, noopts, keeproot) 41 unused(app) 42 self.opendb() 43 self.openconn = self.getPoolSize()
44 45
46 - def getConnection(self, path=None):
47 """Return a connection from the connection pool. If path is passed 48 return the object that the path points to. 49 """ 50 with self.poollock: 51 if not self.is_connected(): 52 self.opendb() 53 connection=self.db.open() 54 root=connection.root() 55 app=root['Application'] 56 self._getContext(app) 57 app._p_jar.sync() 58 if path: 59 return app.getObjByPath(path) 60 else: 61 return app 62 self.openconn -= 1
63 64
65 - def opendb(self):
66 addr = (self.options.host, self.options.port) 67 self._storage=ClientStorage.ClientStorage(addr) 68 self.db=DB(self._storage) 69 self.poollock = Lock()
70 71
72 - def closedb(self):
73 """Close all connections in both free an inuse pools. 74 """ 75 self.db.close() 76 self.db = None 77 self._storage = None
78 79
80 - def is_connected(self):
81 """Are we connected to zeo. 82 """ 83 return not self._storage or self._storage.is_connected()
84 85
86 - def getPoolSize(self):
87 """Return the target max pool size for this database. 88 """ 89 return self.db.getPoolSize()
90 91
92 - def available(self):
93 """Return the number of available connection in our pool. 94 """ 95 if self.db._pools: 96 pool = self.db._pools[''] # trunk version pool 97 return len(pool.available) 98 return 0
99 100
101 - def _getContext(self, app):
102 resp = HTTPResponse(stdout=None) 103 env = { 104 'SERVER_NAME':'localhost', 105 'SERVER_PORT':'8080', 106 'REQUEST_METHOD':'GET' 107 } 108 req = HTTPRequest(None, env, resp) 109 app.__of__(RequestContainer(REQUEST = req)) 110 return app
111 112
113 - def buildOptions(self):
114 """basic options setup sub classes can add more options here""" 115 ZenDaemon.buildOptions(self) 116 self.parser.add_option('--host', 117 dest="host",default="localhost", 118 help="hostname of zeo server") 119 self.parser.add_option('--port', 120 dest="port",type="int", default=8100, 121 help="port of zeo server")
122