circular-reference

I am trying to inject one of my services into an EntityListener in order to call some application specific behaviour when an entity gets updated. My Logger service, used to store events in a LogEntry entity in my database: class Logger { /** * @var EntityManager $manager The doctrine2 manager */ protected $manager; //... } The listener: class EntityListener { public function __construct(Logger $logger) { $this->logger = $logger; // ... } } And the service definitions in my service.yml : listener: class: Namespace\EntityListener arguments: [@logger] tags: - { name: doctrine.event_listener,

Is there any way to set the circular reference limit in the serializer component of Symfony (not JMSSerializer) with any config or something like that? I have a REST Application with FOSRestBundle and some Entities that contain other entities which should be serialized too. But I'm running into circular reference errors. I know how to set it like this: $encoder = new JsonEncoder(); $normalizer = new ObjectNormalizer(); $normalizer->setCircularReferenceHandler(function ($object) { return $object->getName(); }); But this has to be done in more than one controller (overhead for me). I want to set

I'm working on an iPhone application. I have an object of class Row that needs to release numerous objects of the class Block . Every Block currently has a property that retains an instance variable of class Row . @interface Block : UIImageView { Row *yCoord; } @property (nonatomic,retain) Row *yCoord; @end Every Row contains an NSMutableArray of these Blocks. @interface Row : NSObject { NSMutableArray *blocks; } -(void)addBlock:(Block*)aBlock; @end @implementation Row -(void)addBlock:(Block*)aBlock { [blocks addObject:aBlock]; aBlock.yCoord = self; } @end I understand that this is a circular

Ignoring native interop and transients, is it possible to create any data structures in Clojure that contain direct circular references ? It would seem that immutable data structures can only ever contain references to previous versions of themselves. Are there any Clojure APIs that could create a new data structure that has a reference to itself ? Scheme has the letrec form which allows mutually recursive structures to be created - but, as far as I can tell, Clojure does not have anything similar. This question is related to porting Clojure to iOS - which does not have garbage collection, but

Unlike Java, Perl uses reference count for garbage collection. I have tried searching some previous questions which speak about C++ RAII and smart pointers and Java GC but have not understood how Perl deals with the circular referencing problem. Can anyone explain how Perl's garbage collector deals with circular references? Is there any way to reclaim circular referenced memory which are no longer used by the program or does Perl just ignores this problem altogether? According to my copy of Programming Perl 3rd ed. , on exit Perl 5 does an "expensive mark and sweep" to reclaim circular