private void SetupProcessorFactoryForResourceDefinition <TModel>(Mock <IGenericServiceFactory> processorFactory,
IResourceHookContainer <TModel> modelResource, IHooksDiscovery <TModel> discovery, AppDbContext dbContext = null, IResourceGraph resourceGraph = null)
where TModel : class, IIdentifiable <int>
{
processorFactory.Setup(factory => factory.Get <IResourceHookContainer>(typeof(ResourceHooksDefinition <>), typeof(TModel))).Returns(modelResource);
processorFactory.Setup(factory => factory.Get <IHooksDiscovery>(typeof(IHooksDiscovery <>), typeof(TModel))).Returns(discovery);
if (dbContext != null)
{
Type idType = ObjectFactory.GetIdType(typeof(TModel));
if (idType == typeof(int))
{
IResourceReadRepository <TModel, int> repo = CreateTestRepository <TModel>(dbContext, resourceGraph);
processorFactory.Setup(factory =>
factory.Get <IResourceReadRepository <TModel, int> >(typeof(IResourceReadRepository <,>), typeof(TModel), typeof(int))).Returns(repo);
}
else
{
throw new TypeLoadException("Test not set up properly");
}
}
}
/// <inheritdoc />
public void BeforeRead <TResource>(ResourcePipeline pipeline, string stringId = null)
where TResource : class, IIdentifiable
{
IResourceHookContainer <TResource> hookContainer = _containerProvider.GetResourceHookContainer <TResource>(ResourceHook.BeforeRead);
hookContainer?.BeforeRead(pipeline, false, stringId);
List <Type> calledContainers = typeof(TResource).AsList();
// @formatter:wrap_chained_method_calls chop_always
// @formatter:keep_existing_linebreaks true
IncludeExpression[] includes = _constraintProviders
.SelectMany(provider => provider.GetConstraints())
.Select(expressionInScope => expressionInScope.Expression)
.OfType <IncludeExpression>()
.ToArray();
// @formatter:keep_existing_linebreaks restore
// @formatter:wrap_chained_method_calls restore
foreach (ResourceFieldChainExpression chain in includes.SelectMany(IncludeChainConverter.GetRelationshipChains))
{
RecursiveBeforeRead(chain.Fields.Cast <RelationshipAttribute>().ToList(), pipeline, calledContainers);
}
}
/// <summary>
/// Given a source of resources, gets the implicitly affected resources from the database and calls the BeforeImplicitUpdateRelationship hook.
/// </summary>
private void FireForAffectedImplicits(Type resourceTypeToInclude, IDictionary <RelationshipAttribute, IEnumerable> implicitsTarget,
ResourcePipeline pipeline, IEnumerable existingImplicitResources = null)
{
IResourceHookContainer container =
_containerProvider.GetResourceHookContainer(resourceTypeToInclude, ResourceHook.BeforeImplicitUpdateRelationship);
if (container == null)
{
return;
}
IDictionary <RelationshipAttribute, IEnumerable> implicitAffected =
_containerProvider.LoadImplicitlyAffected(implicitsTarget, existingImplicitResources);
if (!implicitAffected.Any())
{
return;
}
Dictionary <RelationshipAttribute, IEnumerable> inverse = new Dictionary <RelationshipAttribute, IEnumerable>();
foreach (KeyValuePair <RelationshipAttribute, IEnumerable> pair in implicitAffected)
{
var inverseRelationship = _resourceGraph.GetInverseRelationship(pair.Key);
if (inverseRelationship != null)
{
inverse.Add(inverseRelationship, pair.Value);
}
}
IRelationshipsDictionary resourcesByRelationship = CreateRelationshipHelper(resourceTypeToInclude, inverse);
CallHook(container, ResourceHook.BeforeImplicitUpdateRelationship, ArrayFactory.Create <object>(resourcesByRelationship, pipeline));
}
/// <summary>
/// Recursively goes through the included relationships from JsonApiContext, translates them to the corresponding hook containers and fires the
/// BeforeRead hook (if implemented)
/// </summary>
private void RecursiveBeforeRead(List <RelationshipAttribute> relationshipChain, ResourcePipeline pipeline, List <LeftType> calledContainers)
{
while (true)
{
RelationshipAttribute relationship = relationshipChain.First();
if (!calledContainers.Contains(relationship.RightType))
{
calledContainers.Add(relationship.RightType);
IResourceHookContainer container = _containerProvider.GetResourceHookContainer(relationship.RightType, ResourceHook.BeforeRead);
if (container != null)
{
CallHook(container, ResourceHook.BeforeRead, new object[]
{
pipeline,
true,
null
});
}
}
relationshipChain.RemoveAt(0);
if (!relationshipChain.Any())
{
break;
}
}
}
/// <summary>
/// For a given <see cref="ResourceHook"/> target and for a given type
/// <typeparamref name="TResource"/>, gets the hook container if the target
/// hook was implemented and should be executed.
/// <para />
/// Along the way, creates a traversable node from the root resource set.
/// </summary>
/// <returns><c>true</c>, if hook was implemented, <c>false</c> otherwise.</returns>
private bool GetHook <TResource>(ResourceHook target, IEnumerable <TResource> resources,
out IResourceHookContainer <TResource> container,
out RootNode <TResource> node) where TResource : class, IIdentifiable
{
node = _traversalHelper.CreateRootNode(resources);
container = _executorHelper.GetResourceHookContainer <TResource>(target);
return(container != null);
}
/// <summary>
/// For a given <see cref="ResourceHook" /> target and for a given type <typeparamref name="TResource" />, gets the hook container if the target hook was
/// implemented and should be executed.
/// <para />
/// Along the way, creates a traversable node from the root resource set.
/// </summary>
/// <returns>
/// <c>true</c>, if hook was implemented, <c>false</c> otherwise.
/// </returns>
private GetHookResult <TResource> GetHook <TResource>(ResourceHook target, IEnumerable <TResource> resources)
where TResource : class, IIdentifiable
{
RootNode <TResource> node = _nodeNavigator.CreateRootNode(resources);
IResourceHookContainer <TResource> container = _containerProvider.GetResourceHookContainer <TResource>(target);
return(new GetHookResult <TResource>(container, node));
}
/// <summary>
/// A helper method to call a hook on <paramref name="container"/> reflectively.
/// </summary>
private IEnumerable CallHook(IResourceHookContainer container, ResourceHook hook, object[] arguments)
{
var method = container.GetType().GetMethod(hook.ToString("G"));
// note that some of the hooks return "void". When these hooks, the
// are called reflectively with Invoke like here, the return value
// is just null, so we don't have to worry about casting issues here.
return((IEnumerable)ThrowJsonApiExceptionOnError(() => method.Invoke(container, arguments)));
}
/// <summary>
/// Fires the AfterUpdateRelationship hook
/// </summary>
private void FireAfterUpdateRelationship(IResourceHookContainer container, IResourceNode node, ResourcePipeline pipeline)
{
Dictionary <RelationshipAttribute, IEnumerable> currentResourcesGrouped = node.RelationshipsFromPreviousLayer.GetRightResources();
// the relationships attributes in currentResourcesGrouped will be pointing from a
// resource in the previous layer to a resource in the current (nested) layer.
// For the nested hook we need to replace these attributes with their inverse.
// See the FireNestedBeforeUpdateHooks method for a more detailed example.
var resourcesByRelationship = CreateRelationshipHelper(node.ResourceType, ReplaceKeysWithInverseRelationships(currentResourcesGrouped));
CallHook(container, ResourceHook.AfterUpdateRelationship, new object[] { resourcesByRelationship, pipeline });
}
private void TraverseNextLayer(IEnumerable <IResourceNode> nextLayer, Action <IResourceHookContainer, IResourceNode> action, ResourceHook target)
{
foreach (IResourceNode node in nextLayer)
{
IResourceHookContainer hookContainer = _containerProvider.GetResourceHookContainer(node.ResourceType, target);
if (hookContainer != null)
{
action(hookContainer, node);
}
}
}
public GetHookResult(IResourceHookContainer <TResource> container, RootNode <TResource> node)
{
Container = container;
Node = node;
}
/// <summary>
/// Fires the nested before hooks for resources in the current <paramref name="layer" />
/// </summary>
/// <remarks>
/// For example: consider the case when the owner of article1 (one-to-one) is being updated from owner_old to owner_new, where owner_new is currently
/// already related to article2. Then, the following nested hooks need to be fired in the following order. First the BeforeUpdateRelationship should be
/// for owner1, then the BeforeImplicitUpdateRelationship hook should be fired for owner2, and lastly the BeforeImplicitUpdateRelationship for article2.
/// </remarks>
private void FireNestedBeforeUpdateHooks(ResourcePipeline pipeline, IEnumerable <IResourceNode> layer)
{
foreach (IResourceNode node in layer)
{
IResourceHookContainer nestedHookContainer =
_containerProvider.GetResourceHookContainer(node.ResourceType, ResourceHook.BeforeUpdateRelationship);
IEnumerable uniqueResources = node.UniqueResources;
RightType resourceType = node.ResourceType;
IDictionary <RelationshipAttribute, IEnumerable> currentResourcesGrouped;
IDictionary <RelationshipAttribute, IEnumerable> currentResourcesGroupedInverse;
// fire the BeforeUpdateRelationship hook for owner_new
if (nestedHookContainer != null)
{
if (uniqueResources.Cast <IIdentifiable>().Any())
{
RelationshipAttribute[] relationships = node.RelationshipsToNextLayer.Select(proxy => proxy.Attribute).ToArray();
IEnumerable dbValues = LoadDbValues(resourceType, uniqueResources, ResourceHook.BeforeUpdateRelationship, relationships);
// these are the resources of the current node grouped by
// RelationshipAttributes that occurred in the previous layer
// so it looks like { HasOneAttribute:owner => owner_new }.
// Note that in the BeforeUpdateRelationship hook of Person,
// we want want inverse relationship attribute:
// we now have the one pointing from article -> person, ]
// but we require the the one that points from person -> article
currentResourcesGrouped = node.RelationshipsFromPreviousLayer.GetRightResources();
currentResourcesGroupedInverse = ReplaceKeysWithInverseRelationships(currentResourcesGrouped);
IRelationshipsDictionary resourcesByRelationship = CreateRelationshipHelper(resourceType, currentResourcesGroupedInverse, dbValues);
IEnumerable <string> allowedIds = CallHook(nestedHookContainer, ResourceHook.BeforeUpdateRelationship,
ArrayFactory.Create <object>(GetIds(uniqueResources), resourcesByRelationship, pipeline)).Cast <string>();
ISet <IIdentifiable> updated = GetAllowedResources(uniqueResources, allowedIds);
node.UpdateUnique(updated);
node.Reassign();
}
}
// Fire the BeforeImplicitUpdateRelationship hook for owner_old.
// Note: if the pipeline is Post it means we just created article1,
// which means we are sure that it isn't related to any other resources yet.
if (pipeline != ResourcePipeline.Post)
{
// To fire a hook for owner_old, we need to first get a reference to it.
// For this, we need to query the database for the HasOneAttribute:owner
// relationship of article1, which is referred to as the
// left side of the HasOneAttribute:owner relationship.
IDictionary <RelationshipAttribute, IEnumerable> leftResources = node.RelationshipsFromPreviousLayer.GetLeftResources();
if (leftResources.Any())
{
// owner_old is loaded, which is an "implicitly affected resource"
FireForAffectedImplicits(resourceType, leftResources, pipeline, uniqueResources);
}
}
// Fire the BeforeImplicitUpdateRelationship hook for article2
// For this, we need to query the database for the current owner
// relationship value of owner_new.
currentResourcesGrouped = node.RelationshipsFromPreviousLayer.GetRightResources();
if (currentResourcesGrouped.Any())
{
// rightResources is grouped by relationships from previous
// layer, ie { HasOneAttribute:owner => owner_new }. But
// to load article2 onto owner_new, we need to have the
// RelationshipAttribute from owner to article, which is the
// inverse of HasOneAttribute:owner
currentResourcesGroupedInverse = ReplaceKeysWithInverseRelationships(currentResourcesGrouped);
// Note that currently in the JsonApiDotNetCore implementation of hooks,
// the root layer is ALWAYS homogenous, so we safely assume
// that for every relationship to the previous layer, the
// left type is the same.
LeftType leftType = currentResourcesGrouped.First().Key.LeftType;
FireForAffectedImplicits(leftType, currentResourcesGroupedInverse, pipeline);
}
}
}
