public void HandleEvent(PreActionHookEvent eventMessage)
{
var entries = eventMessage.ModifiedEntries.ToArray();
if (entries.Length == 0 || !_preHooks.Any())
{
return;
}
foreach (var entry in entries)
{
var e = entry; // Prevents access to modified closure
var preHooks = GetPreHookInstancesFor(e.Entity.GetType());
foreach (var hook in preHooks)
{
if (hook.HookStates == e.PreSaveState && hook.RequiresValidation == eventMessage.RequiresValidation)
{
var metadata = new HookEntityMetadata(e.PreSaveState);
using (var scope = new DbContextScope(hooksEnabled: false))
{
// dead end: don't let hooks call hooks again
hook.HookObject(e.Entity, metadata);
}
if (metadata.HasStateChanged)
{
e.PreSaveState = metadata.State;
}
}
}
}
}
/// <summary>
/// Implements the interface. This causes the hook to only run for objects that are assignable to TEntity.
/// </summary>
public void HookObject(object entity, HookEntityMetadata metadata)
{
if (typeof(TEntity).IsAssignableFrom(entity.GetType()))
{
Hook((TEntity)entity, metadata);
}
}
/// <summary> /// The logic to perform per entity after the registered action gets performed. /// This gets run once per entity that has been changed. /// </summary> public abstract void Hook(TEntity entity, HookEntityMetadata metadata);