/// <summary>
/// Returns the model from the cache, or creates a model if it is not present in the cache.
/// </summary>
/// <param name="context"> The context the model is being produced for. </param>
/// <param name="conventionSetBuilder"> The convention set to use when creating the model. </param>
/// <param name="modelDependencies"> The dependencies object for the model. </param>
/// <returns> The model to be used. </returns>
public virtual IModel GetModel(
DbContext context,
IConventionSetBuilder conventionSetBuilder,
ModelDependencies modelDependencies)
{
var cache = Dependencies.MemoryCache;
var cacheKey = Dependencies.ModelCacheKeyFactory.Create(context);
if (!cache.TryGetValue(cacheKey, out IModel model))
{
// Make sure OnModelCreating really only gets called once, since it may not be thread safe.
lock (_syncObject)
{
if (!cache.TryGetValue(cacheKey, out model))
{
model = CreateModel(context, conventionSetBuilder, modelDependencies);
model = cache.Set(cacheKey, model, new MemoryCacheEntryOptions {
Size = 100, Priority = CacheItemPriority.High
});
}
}
}
return(model);
}
/// <summary>
/// Creates the model. This method is called when the model was not found in the cache.
/// </summary>
/// <param name="context"> The context the model is being produced for. </param>
/// <param name="conventionSetBuilder"> The convention set to use when creating the model. </param>
/// <param name="modelDependencies"> The dependencies object for the model. </param>
/// <returns> The model to be used. </returns>
protected virtual IModel CreateModel(
[NotNull] DbContext context,
[NotNull] IConventionSetBuilder conventionSetBuilder,
[NotNull] ModelDependencies modelDependencies)
{
Check.NotNull(context, nameof(context));
var modelBuilder = new ModelBuilder(conventionSetBuilder.CreateConventionSet(), modelDependencies);
Dependencies.ModelCustomizer.Customize(modelBuilder, context);
return(modelBuilder.FinalizeModel());
}