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implement global lock by locking hands table

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This commit is contained in:
sqlcoder 2009-05-31 21:59:01 +01:00
parent be61b2d253
commit 5b96769de3
2 changed files with 55 additions and 24 deletions
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58
pyfpdb/fpdb.py
View File

@ -174,35 +174,36 @@ class fpdb:
def dia_load_profile(self, widget, data=None):
"""Dialogue to select a file to load a profile from"""
self.obtain_global_lock()
chooser = gtk.FileChooserDialog(title="Please select a profile file to load",
action=gtk.FILE_CHOOSER_ACTION_OPEN,
buttons=(gtk.STOCK_CANCEL,gtk.RESPONSE_CANCEL,gtk.STOCK_OPEN,gtk.RESPONSE_OK))
chooser.set_filename(self.profile)
if self.obtain_global_lock():
chooser = gtk.FileChooserDialog(title="Please select a profile file to load",
action=gtk.FILE_CHOOSER_ACTION_OPEN,
buttons=(gtk.STOCK_CANCEL,gtk.RESPONSE_CANCEL,gtk.STOCK_OPEN,gtk.RESPONSE_OK))
chooser.set_filename(self.profile)
response = chooser.run()
chooser.destroy()
if response == gtk.RESPONSE_OK:
self.load_profile(chooser.get_filename())
elif response == gtk.RESPONSE_CANCEL:
print 'User cancelled loading profile'
response = chooser.run()
chooser.destroy()
if response == gtk.RESPONSE_OK:
self.load_profile(chooser.get_filename())
elif response == gtk.RESPONSE_CANCEL:
print 'User cancelled loading profile'
#end def dia_load_profile
def dia_recreate_tables(self, widget, data=None):
"""Dialogue that asks user to confirm that he wants to delete and recreate the tables"""
self.obtain_global_lock()
if self.obtain_global_lock():
dia_confirm = gtk.MessageDialog(parent=None, flags=0, type=gtk.MESSAGE_WARNING,
buttons=(gtk.BUTTONS_YES_NO), message_format="Confirm deleting and recreating tables")
diastring = "Please confirm that you want to (re-)create the tables. If there already are tables in the database "+self.db.database+" on "+self.db.host+" they will be deleted."
dia_confirm.format_secondary_text(diastring)#todo: make above string with bold for db, host and deleted
dia_confirm = gtk.MessageDialog(parent=None, flags=0, type=gtk.MESSAGE_WARNING,
buttons=(gtk.BUTTONS_YES_NO), message_format="Confirm deleting and recreating tables")
diastring = "Please confirm that you want to (re-)create the tables. If there already are tables in the database "+self.db.database+" on "+self.db.host+" they will be deleted."
dia_confirm.format_secondary_text(diastring)#todo: make above string with bold for db, host and deleted
response = dia_confirm.run()
dia_confirm.destroy()
if response == gtk.RESPONSE_YES:
self.db.recreate_tables()
elif response == gtk.RESPONSE_NO:
print 'User cancelled recreating tables'
response = dia_confirm.run()
dia_confirm.destroy()
if response == gtk.RESPONSE_YES:
self.db.recreate_tables()
elif response == gtk.RESPONSE_NO:
print 'User cancelled recreating tables'
self.release_global_lock()
#end def dia_recreate_tables
def dia_regression_test(self, widget, data=None):
@ -371,7 +372,14 @@ class fpdb:
#end def not_implemented
def obtain_global_lock(self):
print "todo: implement obtain_global_lock (users: pls ignore this)"
print "\nTaking global lock ..."
self.fdb_lock = fpdb_db.fpdb_db()
self.fdb_lock.connect(self.settings['db-backend'],
self.settings['db-host'],
self.settings['db-databaseName'],
self.settings['db-user'],
self.settings['db-password'])
return fpdb_simple.get_global_lock(self.fdb_lock)
#end def obtain_global_lock
def quit(self, widget):
@ -382,7 +390,9 @@ class fpdb:
#end def quit_cliecked
def release_global_lock(self):
print "todo: implement release_global_lock"
self.fdb_lock.db.rollback()
self.fdb_lock.disconnect()
print "Global lock released."
#end def release_global_lock
def tab_abbreviations(self, widget, data=None):

21
pyfpdb/fpdb_simple.py
View File

@ -367,6 +367,27 @@ def analyzeDB(fdb):
fdb.db.commit()
#end def analyzeDB
def get_global_lock(fdb):
if fdb.backend == MYSQL_INNODB:
try:
fdb.cursor.execute( "lock tables Hands write" )
except:
print "Error! failed to obtain global lock. Close all programs accessing " \
+ "database (including fpdb) and try again (%s)." \
% ( str(sys.exc_value).rstrip('\n'), )
return(False)
elif fdb.backend == PGSQL:
try:
fdb.cursor.execute( "lock table Hands in exclusive mode nowait" )
#print "... after lock table, status =", fdb.cursor.statusmessage
except:
print "Error! failed to obtain global lock. Close all programs accessing " \
+ "database (including fpdb) and try again (%s)." \
% ( str(sys.exc_value).rstrip('\n'), )
return(False)
return(True)
class DuplicateError(Exception):
def __init__(self, value):
self.value = value