[appengine-java] Re: QueueFactory.getQueue( String )
On Sep 6, 4:48 am, Vince Bonfanti vbonfa...@gmail.com wrote:
I found the answer to this: the Queue.add() method throws
IllegalArgumentException if the specified queue isn't configured (BTW,
the message in the IllegalArgumentException is The specified queue is
unknown : but doesn't actually include the queue name in the message
string). This isn't as nice as what I'd like, but I can see that the
queue.xml file isn't processed until Queue.add() is invoked.
The Java task queue library never processes queue.xml.
There is no other feedback that the queue is not configured from the
API other than the exception given.
I guess my workaround will be to try to add a dummy task to the queue
when I create it:
private static Queue queue;
static {
queue = QueueFactory.getQueue( myQueue );
try {
queue.add();
} catch ( IllegalArgumentException e ) {
queue = QueueFactory.getDefaultQueue();
queue.add(); ...
}
}
Note that this also may fail. The default queue is only special in
that one is created for you if it does not exist but it may also be
configured off or paused.
I'm trying to simplify configuration for users of GaeVFS
(http://code.google.com/p/gaevfs/). Rather than requiring them to
configure task queues for GaeVFS, I'd like to have it use the default
queue by default. However, if they want to change the behavior for
specific queues, then they can configure them explicitly.
Should I open an issue for a simpler way to detect if a queue is
configured? or is this something that's unlikely to change?
I think I see where you're coming from here but if you can file a bug
it would help us understand how to improve the API.
Vince
On Fri, Sep 4, 2009 at 6:19 PM, Vince Bonfantivbonfa...@gmail.com wrote:
My first question on task queues...
I'd like to design my application to use a named (configured) queue if
it exists, but to drop back to using the default queue if the named
queue isn't configured. I'd like to do something like this:
Queue q = QueueFactory.getQueue( myQueue );
if ( q == null ) {
q = QueueFactory.getDefaultQueue();
}
But, the documentation for QueueFactory.getQueue( String ) implies
that this isn't how it works:
Attempting to use a non-existing queue name may result in errors
at the point of use of the Queue object and not when calling
getQueue(String).
Is there a way to simply and reliably determine whether a given queue
name has been configured?
Vince
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[appengine-java] Re: QueueFactory.getQueue( String )
Done (#2089).
BTW, I've opened two issues on the Task Queue API that I consider
fairly serious (at least for what I'm trying to accomplish):
#2088. A datastore Key that has a parent does not survive a
round-trip through keyToString and stringToKey and still be usable as
a memcache key. The bug report contains more details and a simple
example that doesn't require task queues (so technically, this isn't a
task queue issue).
#2090. TaskOptions doesn't support multiple parameters with the same
name. Again, the bug report has more details about why this is
important.
I'd be interested in getting some feedback on these.
Vince
On Tue, Sep 8, 2009 at 4:11 PM, Jason (Google)apija...@google.com wrote:
Hi Vince. I think this sounds reasonable. Please open a new issue.
- Jason
On Sat, Sep 5, 2009 at 11:48 AM, Vince Bonfanti vbonfa...@gmail.com wrote:
I found the answer to this: the Queue.add() method throws
IllegalArgumentException if the specified queue isn't configured (BTW,
the message in the IllegalArgumentException is The specified queue is
unknown : but doesn't actually include the queue name in the message
string). This isn't as nice as what I'd like, but I can see that the
queue.xml file isn't processed until Queue.add() is invoked.
I guess my workaround will be to try to add a dummy task to the queue
when I create it:
private static Queue queue;
static {
queue = QueueFactory.getQueue( myQueue );
try {
queue.add();
} catch ( IllegalArgumentException e ) {
queue = QueueFactory.getDefaultQueue();
}
}
I'm trying to simplify configuration for users of GaeVFS
(http://code.google.com/p/gaevfs/). Rather than requiring them to
configure task queues for GaeVFS, I'd like to have it use the default
queue by default. However, if they want to change the behavior for
specific queues, then they can configure them explicitly.
Should I open an issue for a simpler way to detect if a queue is
configured? or is this something that's unlikely to change?
Vince
On Fri, Sep 4, 2009 at 6:19 PM, Vince Bonfantivbonfa...@gmail.com wrote:
My first question on task queues...
I'd like to design my application to use a named (configured) queue if
it exists, but to drop back to using the default queue if the named
queue isn't configured. I'd like to do something like this:
Queue q = QueueFactory.getQueue( myQueue );
if ( q == null ) {
q = QueueFactory.getDefaultQueue();
}
But, the documentation for QueueFactory.getQueue( String ) implies
that this isn't how it works:
Attempting to use a non-existing queue name may result in errors
at the point of use of the Queue object and not when calling
getQueue(String).
Is there a way to simply and reliably determine whether a given queue
name has been configured?
Vince
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[appengine-java] Re: QueueFactory.getQueue( String )
Hi Vince. I think this sounds reasonable. Please open a new issue.
- Jason
On Sat, Sep 5, 2009 at 11:48 AM, Vince Bonfanti vbonfa...@gmail.com wrote:
I found the answer to this: the Queue.add() method throws
IllegalArgumentException if the specified queue isn't configured (BTW,
the message in the IllegalArgumentException is The specified queue is
unknown : but doesn't actually include the queue name in the message
string). This isn't as nice as what I'd like, but I can see that the
queue.xml file isn't processed until Queue.add() is invoked.
I guess my workaround will be to try to add a dummy task to the queue
when I create it:
private static Queue queue;
static {
queue = QueueFactory.getQueue( myQueue );
try {
queue.add();
} catch ( IllegalArgumentException e ) {
queue = QueueFactory.getDefaultQueue();
}
}
I'm trying to simplify configuration for users of GaeVFS
(http://code.google.com/p/gaevfs/). Rather than requiring them to
configure task queues for GaeVFS, I'd like to have it use the default
queue by default. However, if they want to change the behavior for
specific queues, then they can configure them explicitly.
Should I open an issue for a simpler way to detect if a queue is
configured? or is this something that's unlikely to change?
Vince
On Fri, Sep 4, 2009 at 6:19 PM, Vince Bonfantivbonfa...@gmail.com wrote:
My first question on task queues...
I'd like to design my application to use a named (configured) queue if
it exists, but to drop back to using the default queue if the named
queue isn't configured. I'd like to do something like this:
Queue q = QueueFactory.getQueue( myQueue );
if ( q == null ) {
q = QueueFactory.getDefaultQueue();
}
But, the documentation for QueueFactory.getQueue( String ) implies
that this isn't how it works:
Attempting to use a non-existing queue name may result in errors
at the point of use of the Queue object and not when calling
getQueue(String).
Is there a way to simply and reliably determine whether a given queue
name has been configured?
Vince
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You received this message because you are subscribed to the Google Groups
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[appengine-java] Re: QueueFactory.getQueue( String )
I found the answer to this: the Queue.add() method throws
IllegalArgumentException if the specified queue isn't configured (BTW,
the message in the IllegalArgumentException is The specified queue is
unknown : but doesn't actually include the queue name in the message
string). This isn't as nice as what I'd like, but I can see that the
queue.xml file isn't processed until Queue.add() is invoked.
I guess my workaround will be to try to add a dummy task to the queue
when I create it:
private static Queue queue;
static {
queue = QueueFactory.getQueue( myQueue );
try {
queue.add();
} catch ( IllegalArgumentException e ) {
queue = QueueFactory.getDefaultQueue();
}
}
I'm trying to simplify configuration for users of GaeVFS
(http://code.google.com/p/gaevfs/). Rather than requiring them to
configure task queues for GaeVFS, I'd like to have it use the default
queue by default. However, if they want to change the behavior for
specific queues, then they can configure them explicitly.
Should I open an issue for a simpler way to detect if a queue is
configured? or is this something that's unlikely to change?
Vince
On Fri, Sep 4, 2009 at 6:19 PM, Vince Bonfantivbonfa...@gmail.com wrote:
My first question on task queues...
I'd like to design my application to use a named (configured) queue if
it exists, but to drop back to using the default queue if the named
queue isn't configured. I'd like to do something like this:
Queue q = QueueFactory.getQueue( myQueue );
if ( q == null ) {
q = QueueFactory.getDefaultQueue();
}
But, the documentation for QueueFactory.getQueue( String ) implies
that this isn't how it works:
Attempting to use a non-existing queue name may result in errors
at the point of use of the Queue object and not when calling
getQueue(String).
Is there a way to simply and reliably determine whether a given queue
name has been configured?
Vince
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