/// <summary>
/// Add an item to cache if it is not already in it
/// </summary>
/// <param name="info">Item to add</param>
/// <param name="keyName">The key name of the object</param>
public static void TrySet(ClassInformation info, string keyName)
{
lock (cacheAccessLock)
{
if (!cache.ContainsKey(keyName))
{
cache.Add(keyName, info);
}
}
}
/// <summary>
/// Inspect a class for Azure Tables
/// </summary>
/// <typeparam name="ClassT">Type of business class to be stored into Azure Tables</typeparam>
/// <returns>Reflected class metadata</returns>
public static ClassInformation?InspectForAzureTables <ClassT>()
where ClassT : class
{
Type classType = typeof(ClassT);
string cacheKeyName = classType.FullName ?? classType.Name;
ClassInformation?objectMetadata = Cache.TryGet(cacheKeyName);
if (objectMetadata != null)
{
// cache hit
return(objectMetadata);
}
TableAttribute?tableAttribute = classType.GetCustomAttribute <TableAttribute>(true);
if (tableAttribute == null)
{
return(null);
}
List <Property> properties = new List <Property>();
List <Field> fields = new List <Field>();
bool hasPartitionKey = false, hasRowKey = false, hasETag = false, hasTimestamp = false;
foreach (MemberInfo member in classType.GetMembers(MEMBER_SEARCH_FLAGS))
{
object[] memberAttributes = member.GetCustomAttributes(true);
if ((memberAttributes == null) || (memberAttributes.Length == 0))
{
continue;
}
foreach (object attribute in memberAttributes)
{
if (attribute is ETagAttribute)
{
if (hasETag)
{
throw new InvalidOperationException($"'{cacheKeyName}' has multiple ETag properties defined.");
}
hasETag = true;
}
if (attribute is PartitionKeyAttribute)
{
if (hasPartitionKey)
{
throw new InvalidOperationException($"'{cacheKeyName}' has multiple PartitionKey properties defined.");
}
hasPartitionKey = true;
}
if (attribute is RowKeyAttribute)
{
if (hasRowKey)
{
throw new InvalidOperationException($"'{cacheKeyName}' has multiple RowKey properties defined.");
}
hasRowKey = true;
}
if (attribute is TimestampAttribute)
{
// since we never read this back into the TableEntity, there can be as many of these as the developer wants :)
hasTimestamp = true;
}
}
if (!(hasPartitionKey || hasRowKey))
{
continue;
}
switch (member.MemberType)
{
case MemberTypes.Field:
FieldInfo?fi = member as FieldInfo;
if (fi != null)
{
fields.Add(new Field(fi));
}
break;
case MemberTypes.Property:
PropertyInfo?pi = member as PropertyInfo;
if (pi != null)
{
properties.Add(new Property(pi));
}
break;
}
}
if ((properties.Count == 0) && (fields.Count == 0) || (!hasPartitionKey) || (!hasRowKey))
{
return(null);
}
objectMetadata = new ClassInformation(classType.Name, cacheKeyName, tableAttribute, properties, fields)
{
// without these two, we don't get here!
HasPartitionKey = true,
HasRowKey = true,
HasETag = hasETag,
HasTimestamp = hasTimestamp
};
Cache.TrySet(objectMetadata, cacheKeyName);
return(objectMetadata);
}
