I have seen this usage construct in a few places in the code and it makes
no sense to me:
class X
{
HashMap clients = new HashMap();
public void someMethod()
{
synchronized(clients)
{
HashMap m = new HashMap(clients);
m.put(dc, cq);
clients=m;
}
...
}
public void someOtherMethod()
{
Iterator i = clients.keySet().iterator();
while( i.hasNext() )
{
...
}
}
}
The unsynchronized clients HashMap is synchronized and copied when
modified and accessed without synchronization in other contexts. This is
not thread safe for the accesses and makes for very expensive updates.
Why isn't the HashMap simply synchronized and used without copying?
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Scott Stark
Chief Technology Officer
JBoss Group, LLC
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