Loved the article, especially the diagrams, a picture 1000 words…

I’m trying to track down a copy of the PPT please for your talk “Introduction to Coherence for Developers and Architects”.
I’m working on a large Canadian OFM project and believe that Coherence would be a great fit, so I’m looking more to guide.

can you help please ?

The latest release of Oracle Enterprise Pack for Eclipse (OEPE) now includes a Coherence Facet. This makes it convenient to quickly start up a Coherence project and launch nodes right in the IDE. Recently I took it for a test drive and took some notes …

Recently I was helping a customer install Coherence*Web on a JSF application. After running the install and deploying the war file, I saw the following exception: javax.servlet.ServletException: Error while saving state in ‘session’: ‘session attrib…

A few days ago I read an excellent post by Martin Elwin on creating a query cache using Coherence. To summarize, he uses a Coherence Filter (an object that contains query criteria) as a key and the results of the query (in this case, a set of keys for …

My Cache key implementation is
public class TradeCacheKey implements PortableObject,KeyAssociation{
private String tradeId;
transient private Identifier contextIdentifier;

public TradeCacheKey()
{

}

/**
* constructor to create TradecacheKey
* @param tradeId – tradeId of Trade
* @param contextIdentifier – context Identifier
*/
public TradeCacheKey(String tradeId, Identifier contextIdentifier) {

this.tradeId = tradeId;
this.contextIdentifier = contextIdentifier;
}

public TradeCacheKey(String tradeId) {

this.tradeId = tradeId;

}

@Override
public void readExternal(PofReader pofreader) throws IOException {
// TODO Auto-generated method stub
tradeId = pofreader.readString(0);
// contextIdentifier = (Identifier)pofreader.readObject(1);
}

@Override
public void writeExternal(PofWriter pofwriter) throws IOException {
// TODO Auto-generated method stub
pofwriter.writeString(0, tradeId);
//pofwriter.writeObject(1, contextIdentifier);
}

public String getTradeId()
{
return tradeId;
}
/**
*
* returns hash code for this object
*/
public int hashCode() {

int result = 1;

result = 31
* result
+ ((tradeId == null) ? 0 : tradeId
.hashCode());
return result;
}

/**
*
*/
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
TradeCacheKey other = (TradeCacheKey) obj;

if (tradeId == null) {
if (other.tradeId != null)
return false;
} else if (!tradeId.equals(other.tradeId))
return false;

return true;
}

@Override
public Object getAssociatedKey() {
return contextIdentifier;
}

}

I put the key to cache as
tradeCache.put(new TradeCacheKey(trade.getTradeId(),contextIdentifier), “TEST”);
System.out.println(” Entry inside cache is ” + tradeHistoryCache.get(new TradeCacheKey(trade.getTradeId())));

Here the second line pri nts Entry inside cache is null.
More interestingly if i get all the keys from cache and print values inside cache it gives me null
Set<Entry> entrySet = tradeCache.entrySet();
Iterator<Entry> itr = entrySet.iterator();
while(itr.hasNext()){
Entry entry = itr.next();
TradeCacheKey key = (TradeCacheKey)entry.getKey();
System.out.println(“Key is ” + key);
System.out.println(“Get value using key ” + tradeCache.get(key));
System.out.println(“Get value using new key ” + tradeCache.get(new TradeCacheKey(key.getTradeId())));

}
The output is
Key is com.csfb.fid.gtb.tradecache.TradeCacheKey@28ccdc70
Get value using key null
Get value using new key null

I dont know whether am i going wrong somewhere by not adding transient field to hashcode, equals, readexternal and writeexternal?

I am implementing a concurrency for cache operation. I dont want to use cache.lock as it seems to be expensive performancewise. I will explain the problem. My cache is running on Node1 and Node2. The entryprocessor for cache key key1 runs on node1. This entryprocessor needs to access/update key2 of same cache. I cant access the key2 using cache.get inside entryprocessor as it will throw pollingexception.
So The only way to handle this problem is accessing backing map. But there is no guarentee that key2 will be on node1 , it can be on node2. So how can i access backing map of node2 inside entryprocessor running on node1? Or can you suggest any other way to handle this situdation?