RE: Errors from LRUMemoryCache

[Todd Carmichael]

Both of the method calls within the synchronized block are already marked as
synchronized.  How does the synchronized block around the two calls solve a
problem unless two threads were trying to update the exact same instance of
ICacheElement?

ToddC


-----Original Message-----
From: Amy Wang [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, September 09, 2003 7:41 PM
To: 'Turbine JCS Developers List'; 'Turbine JCS Users List'
Subject: RE: Errors from LRUMemoryCache


In case anybody run into the same issue. 
This problem is fixed by putting a 'synchronized' statement in
LRUMemorycache.java

public void update(ICacheElement ce) throws IOException {
                // Asynchronisly create a MemoryElement

                ce.getElementAttributes().setLastAccessTimeNow();
                
                MemoryElementDescriptor old = null;
                
                // the following operation has to be atomic 
            synchronized (this) {
                        addFirst(ce);
                        old =
(MemoryElementDescriptor)map.put(first.ce.getKey(), first);
            }
.....
}

this mailing list is so quieeeeeeeeeet... 

> -----Original Message-----
> From: Amy Wang [mailto:[EMAIL PROTECTED]
> Sent: Thursday, August 21, 2003 6:52 PM
> To: 'Turbine JCS Users List'; 'Turbine JCS Developers List'
> Subject: Errors from LRUMemoryCache
> 
> 
> Does anyone know what's happening here?
> I got bunch of exceptions from LRUMemoryCache.
> There is no object serialized to the disk cache. After this
> error, many
> objects are lost. 
> What would have caused this problem? 
> Much appreciated. 
>  
> 22:29:50,375 ERROR [LRUMemoryCache] key hashcode=1318941830 
> 22:29:50,375 ERROR [LRUMemoryCache] key 
> toString=omi.wm.is.IsService:host=hqdeva
> pp004.intersperse.com,pkg=MultipleServices900,port=5555,svc=se
> rvice18:se
> rvic
> e18Copy2
> 22:29:50,437 ERROR [LRUMemoryCache] 
> verifycache[hqdevapp002_replicaRegionObjectM
> ap]: map does not contain value : 
> org.apache.jcs.engine.memory.lru.MemoryElement
> [EMAIL PROTECTED]
> 22:29:51,265 ERROR [LRUMemoryCache] 
> verifycache[hqdevapp002_replicaRegionObjectM
> ap]: key not found in list : Keys
> 22:29:51,281 ERROR [LRUMemoryCache] verifycache: map contains key 
> 22:29:51,468 ERROR [LRUMemoryCache] 
> verifycache[hqdevapp002_replicaRegionObjectM
> ap]: map does not contain key : 
> omi.wm.is.IsService:host=hqdevapp004.intersperse
> .com,pkg=MultipleServices900,port=5555,svc=service18:servi
> ce18Copy2
> 

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