I really love WeakReference's. But I wish there was a way to tell the CLR how much (say, on a scale of 1 to 5) how weak you consider the reference to be. That would be brilliant. Java has SoftReference, WeakReference and I believe also a third type called a "phantom reference". That's 3 levels right there which the GC has a different be...
namespace Test { class Test { delegate void HandleMessage(string message); public void handleMessage(string message){} static void Main(string[] args) { HandleMessage listener1 = new Test().handleMessage; WeakReference w1 = new WeakReference(listener1); HandleMessage listener2 = (message) => { ...
I have a project where i'm trying to use weakrefs with callbacks, and I don't understand what I'm doing wrong. I have created simplified test that shows the exact behavior i'm confused with. Why is it that in this test test_a works as expected, but the weakref for self.MyCallbackB disappears between the class initialization and calling...
I am familiar with WeakReference, but I am looking for a reference type that is cleared only when memory is low, not simply every time when the gc runs (just like Java's SoftReference). I'm looking for a way to implement a memory-sensitive cache. ...
I've tentatively written this method: public static Func<T> WeakCacheFor<T>( Func<T> provider ) where T: class { var cache = new WeakReference(null); return () => { var x = (T)cache.Target; if( x == null ) { x = provider(); cache.Target = x; } return x; }; } S...
Hi, i have a cache that uses WeakReferences to the cached objects to make them automatically removed from the cache in case of memory pressure. My problem is that the cached objects are collected very soon after they have been stored in the cache. The cache runs in a 64-Bit application and in spite of the case that more than 4gig of mem...
My limited understanding of ThreadLocal is that it has resource leak issues. I gather this problem can be remedied through proper use of WeakReferences with ThreadLocal (although I may have misunderstood this point.) I would simply like a pattern or example for correctly using ThreadLocal with WeakReference, if one exists. For instance,...
In Python, is there a way to call a function after an object is finalized? I thought the callback in a weakref would do it, but it appears a weakref's callback is called once the object is garbage collected, but before the objects __del__ method is called. This seems contrary to the notes on weakrefs and garbace collection in the Pytho...
In .NET 3.5, Does WeakReference work with String or shall I wrap it in a small "class" to make it work with it? ...
WeakReference implementation in .NET has an IsAlive Property. 1) Are there any performance/behavior differences between using the IsAlive property or testing whether the Target property is not null? 2) IsAlive is a redundant property? Thanks. ...
I would like to implement a custom debugger visualiser in vs2008 for a typical array as the standard one does not display the data as I would like it. However Visual Studio prevents doing this for arrays for security reasons. I seem to remember though reading about using a WeakReference as a wrapper object to get around this limitation....
The following simple code reproduces the growth of java.lang.ref.WeakReference objects in the heap: public static void main(String[] args) throws Exception { while (true) { java.util.logging.Logger.getAnonymousLogger(); Thread.sleep(1); } } Here is the output of jmap command within a few seconds interval: user@t1007:~> jmap -d64 -hi...
My APP received a big data that was used about twice times. So, I think It`ll cause a memory problem. In this case I use the WeakReference class on java. But, I couldn`t find any class for weak references like java. Is there any class for weak refereces on iPhoneOS? Is this the only way in this case, that using didReceiveMemoryWarning...
I've something like this private Map<MyObj1, MyObj2> map = new WeakHashMap<MyObj1, MyObj2>(); ... somewhere in the code ... MyObj1 myObj1 = new MyObj1(); map.put(myObj1, new MyObj2(); ... myObj1 = null; ... somewhere else in a thread ... (I would like to pass to a checkThis(MyObj2) method the Value associated with the entry that...
Hi, i am trying to create an background thread that updates a Runnable at a given interval. It should also not prevent the "parent" from beeing garbage collected. My problem is as follows. My WeakReference seems to act as a "strong" Reference, It doesn't stop my thread form accessing the runnable that i am supposed to have made availab...
Hi all. I'm trying to use a type-safe WeakReference in my Silverlight app. I'm following the recipe on this site: http://ondevelopment.blogspot.com/2008/01/generic-weak-reference.html only using the System.WeakReference and omitting the stuff that references Serialization. It's throwing a ReflectionTypeLoadException when I try to run i...
I have been a java developer 2 years. But I have never wrote a WeakReference in my code. How to use WeakReference to make my application more efficiency especially in Android application. ...
import threading import weakref _mainlock = threading.RLock() _job_locks = weakref.WeakValueDictionary() def do_thing(job_id): _mainlock.acquire() #Dictionary modification lock acquire _job_locks.setdefault(job_id, threading.RLock()) #Possibly modifies the dictionary _mainlock.release() _job_locks[job_id].acquire() tr...
I'm creating a simple messaging system for a windows phone silverlight app. The idea is various xaml pages & other objects will subscribe to a messaging object, passing in the type of message they want to recieve/handle and an Action<> Delegate as the handler. When an action happens a message (with payload) will be sent to the correct ...
I have a cache built from a Map to SoftReferences. When they are added they get put into another queue to be lazily compressed down via gzip or some such. My idea is this: I want to have WeakReferences to the objects in the compress queue, so that when the compressor task gets to the object, if it is already gone we needn't bother compre...