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nexedi
ZODB
Commits
99aa5fa4
Commit
99aa5fa4
authored
Nov 26, 2009
by
Laurence Rowe
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add download link to chatter.py; add transaction abort to conflict handling
parent
c70f34f6
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2
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2 changed files
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8 additions
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9 deletions
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-9
zodbguide/chatter.py
zodbguide/chatter.py
+2
-2
zodbguide/zeo.rst
zodbguide/zeo.rst
+6
-7
No files found.
zodbguide/chatter.py
View file @
99aa5fa4
...
@@ -62,10 +62,10 @@ class ChatSession(Persistent):
...
@@ -62,10 +62,10 @@ class ChatSession(Persistent):
self
.
_messages
[
now
]
=
message
self
.
_messages
[
now
]
=
message
transaction
.
commit
()
transaction
.
commit
()
except
ConflictError
:
except
ConflictError
:
# Conflict occurred; this process should
pause and
# Conflict occurred; this process should
abort,
# wait for a little bit, then try again.
# wait for a little bit, then try again.
transaction
.
abort
()
time
.
sleep
(.
2
)
time
.
sleep
(.
2
)
pass
else
:
else
:
# No ConflictError exception raised, so break
# No ConflictError exception raised, so break
# out of the enclosing while loop.
# out of the enclosing while loop.
...
...
zodbguide/zeo.rst
View file @
99aa5fa4
...
@@ -155,11 +155,10 @@ Sample Application: chatter.py
...
@@ -155,11 +155,10 @@ Sample Application: chatter.py
For an example application, we'll build a little chat application. What's
For an example application, we'll build a little chat application. What's
interesting is that none of the application's code deals with network
interesting is that none of the application's code deals with network
programming at all; instead, an object will hold chat messages, and be magically
programming at all; instead, an object will hold chat messages, and be
shared between all the clients through ZEO. I won't present the complete script
magically shared between all the clients through ZEO. I won't present the
here; it's included in my ZODB distribution, and you can download it from
complete script here; you can download it from :download:`chatter.py
`<http://www.amk.ca/zodb/demos/>`_. Only the interesting portions of the code
<chatter.py>`. Only the interesting portions of the code will be covered here.
will be covered here.
The basic data structure is the :class:`ChatSession` object, which provides an
The basic data structure is the :class:`ChatSession` object, which provides an
:meth:`add_message` method that adds a message, and a :meth:`new_messages`
:meth:`add_message` method that adds a message, and a :meth:`new_messages`
...
@@ -197,10 +196,10 @@ breaking out of the loop when the commit works without raising an exception. ::
...
@@ -197,10 +196,10 @@ breaking out of the loop when the commit works without raising an exception. ::
self._messages[now] = message
self._messages[now] = message
get_transaction().commit()
get_transaction().commit()
except ConflictError:
except ConflictError:
# Conflict occurred; this process should
pause and
# Conflict occurred; this process should
abort,
# wait for a little bit, then try again.
# wait for a little bit, then try again.
transaction.abort()
time.sleep(.2)
time.sleep(.2)
pass
else:
else:
# No ConflictError exception raised, so break
# No ConflictError exception raised, so break
# out of the enclosing while loop.
# out of the enclosing while loop.
...
...
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