Question

I am using Amazon SimpleDB for select queries, and I am trying to use the AWS AmazonServiceRequestDelegate, here are the delegate methods (I have conformed in .h BTW):

- (void)request:(AmazonServiceRequest *)request didFailWithError:(NSError *)error {

    NSLog(@"%@", error.localizedDescription);
}

- (void)request:(AmazonServiceRequest *)request didReceiveData:(NSData *)data {

    NSLog(@"recieving data");
}

- (void)request:(AmazonServiceRequest *)request didReceiveResponse:(NSURLResponse *)response {

    NSLog(@"response recieved");
}

- (void)request:(AmazonServiceRequest *)request didCompleteWithResponse:(AmazonServiceResponse *)response {

    NSLog(@"Completed");
}

They all get called except didCompleteWithResponse:, the method that is supposed to be called when the whole operation is completed with a response. didFailWithError: isn’t getting called either, but I don’t see any reason for my operation to fail anyways.

Here is my code to create the select query:

        SimpleDBSelectRequest *sReq = [[SimpleDBSelectRequest alloc] initWithSelectExpression:SELECT_STRING andConsistentRead: YES];

    sReq.delegate = self;

    sReq.requestTag = FIND_FRIENDS_SDB;

    [sdbClient select: sReq];

Where SELECT_STRING and FIND_FRIENDS_SDB are predefined and valid to the context strings.

What is my problem here? Thanks!

Update:

Got the delegating to work. Getting an error related to my SimpleDB SELECT queries, apparently the syntax for my SELECT expression is invalid. I get two errors, because I am doing two queries, here are the SELECT expressions for each:

select * from trvlogue-app where Type = ‘account’ AND itemName() = ‘me%40rohankapur.com-account’

That is looking at the ‘Type’ attribute and ‘itemName()’ and checking if they equal to something in the domain.

select * from trvlogue-app where Email in(‘kate-bell%40mac.com’,’www.creative-consulting-inc.com’,’d-higgins%40mac.com’,’John-Appleseed%40mac.com’,’anna-haro%40mac.com’,’hank-zakroff%40mac.com’)

That is checking if these strings are present in the Email attribute in the domain.

NOTE:

Fixed it, apparently when using SELECT expressions, domain names cannot have dashes. Or dashes seem to break the requests somehow

Answer 1

When using AmazonServiceRequestDelegate, this blog post can be helpful. Basically, you need to:

1. Avoid using AmazonServiceRequestDelegate in a background thread.
2. Retain a strong reference to the client.
3. Retain a strong reference to the delegate.

Also, you should make sure you called [AmazonErrorHandler shouldNotThrowExceptions] since you didn’t implement request:didFailWithServiceException:. Please take a look at this blog post for the detail.