I'm trying to write a transaction-safe way of performing a lazy load of an
object from the database if it doesnt exist. However as IgniteCache doesn't
have the equivalent of HashMap.computeIfAbsent, I'm trying to use the
IgniteCache.lock method to achieve this.
The question is whether IgniteCache.lock will lock the cache for that key even
if <b>the key does not yet exist in the cache</b>.
Following is the example code,
public GridOrder getOrder(OrderKey key) {
Lock orderKeyLock = cache.lock(key);
try {
orderKeyLock.lock();
if (!cache.containsKey(key)) {
GridOrder order = loadOrderFromDb(key);
if ( order == null) {
throw new IllegalStateException("Key " + key + " not in
Order Cache or in Database DB Name ");
}
cache.put(key,order);
}
return cache.get(key);
} finally {
orderKeyLock.unlock();
}
}
Alternatively, is there a better way to achieve this?
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