public static void AssertNoConflict(this IConcurrencyAware item, IConcurrencyAware against)
{
if (ConflictsWith(item, against))
{
throw new ConcurrencyConflictException(item.ETag, against.ETag);
}
}
public static bool ConflictsWith(this IConcurrencyAware item, IConcurrencyAware against)
{
if (item.ETag != null && against.ETag != null)
{
return (item.ETag != against.ETag);
}
if (item.LastModofied.HasValue && against.LastModofied.HasValue)
{
return (item.LastModofied.Value != against.LastModofied.Value);
}
// if all values null it is OK
if (!item.LastModofied.HasValue && !against.LastModofied.HasValue &&
item.ETag == null && against.ETag == null)
return false;
throw new InvalidOperationException("Concurrency data not consistent");
}
private static void CheckConcurrency(IConcurrencyAware concurrencyAware,
CloudBlockBlob blobReference)
{
if (concurrencyAware != null)
{
if (!string.IsNullOrEmpty(concurrencyAware.ETag) &&
blobReference.Properties.ETag != concurrencyAware.ETag)
{
throw new ConcurrencyConflictException(concurrencyAware.ETag,
blobReference.Properties.ETag);
}
if (concurrencyAware.LastModofied != null &&
blobReference.Properties.LastModified != null &&
blobReference.Properties.LastModified != concurrencyAware.LastModofied)
{
throw new ConcurrencyConflictException(concurrencyAware.LastModofied.Value,
blobReference.Properties.LastModified.Value);
}
}
}
public static bool ConflictsWith(this IConcurrencyAware item, IConcurrencyAware against)
{
if (item.ETag != null && against.ETag != null)
{
return(item.ETag != against.ETag);
}
if (item.LastModified.HasValue && against.LastModified.HasValue)
{
return(item.LastModified.Value != against.LastModified.Value);
}
// if all values null it is OK
if (!item.LastModified.HasValue && !against.LastModified.HasValue &&
item.ETag == null && against.ETag == null)
{
return(false);
}
throw new InvalidOperationException("Concurrency data not consistent");
}
public static void AssertNoConflict(this IConcurrencyAware item, IConcurrencyAware against)
{
if(ConflictsWith(item, against))
throw new ConcurrencyConflictException(item.ETag, against.ETag);
}
private static void CheckConcurrency(IConcurrencyAware concurrencyAware,
CloudBlockBlob blobReference)
{
if (concurrencyAware != null)
{
if (!string.IsNullOrEmpty(concurrencyAware.ETag) &&
blobReference.Properties.ETag != concurrencyAware.ETag)
{
throw new ConcurrencyConflictException(concurrencyAware.ETag,
blobReference.Properties.ETag);
}
if (concurrencyAware.LastModofied != null &&
blobReference.Properties.LastModified != null &&
blobReference.Properties.LastModified != concurrencyAware.LastModofied)
{
throw new ConcurrencyConflictException(concurrencyAware.LastModofied.Value,
blobReference.Properties.LastModified.Value);
}
}
}