cib data caching based on urls. This is simplest case, no loadDelegate is supported.

gistfile1.txt

/*
 * Store all CIB data on a url-data basis in this dictionary. To prevent cibs from
 * being continously downloaded by the CPWindowController, or rather the CPCib, we
 * override the responsible init method and cache the data.
 */
CibDataCacheDictionary = [CPDictionary dictionary];

@implementation CPCib (CacheDataResponse)

/*
 * The argument, at least in the current application, always seems to be a CPString. 
 * So we can assume that, and append a timestamp to avoid caching problems.
 */
- (id)initWithContentsOfURL:(CPURL)aURL
{
  self = [super init];

  if (self)
  {
    if ( [CibDataCacheDictionary objectForKey:aURL] ) {
      _data = [CPData dataWithRawString:[[CibDataCacheDictionary 
                                           objectForKey:aURL] rawString]];
    } else {
      var request = [CPURLRequest 
                      requestWithURL:[aURL stringByAppendingFormat:"?%s", 
                                           [CPString timestamp]]];
      _data = [CPURLConnection sendSynchronousRequest:request returningResponse:nil];
      [CibDataCacheDictionary setObject:_data forKey:aURL];
    }
    _awakenCustomResources = YES;
  }
  return self;
}

@end

@implementation CPString (IsBlank)

+ (CPString)timestamp
{
  return [CPString stringWithFormat:"%d", new Date().getTime()];
}
@end