/**
* The keys returned are a union of the set of keys in the current transaction and those in the
* backing cache.
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public Collection<K> getKeys() {
Collection<Serializable> keys = null;
// in-txn layering
if (AlfrescoTransactionSupport.getTransactionId() != null) {
keys = new HashSet<Serializable>(23);
TransactionData txnData = getTransactionData();
if (!txnData.isClearOn) {
// the backing cache is not due for a clear
Collection<K> backingKeys = (Collection<K>) sharedCache.getKeys();
Collection<Serializable> backingCacheKeys = new HashSet<Serializable>(backingKeys.size());
for (K backingKey : backingKeys) {
backingCacheKeys.add(getTenantAwareCacheKey(backingKey));
}
keys.addAll(backingCacheKeys);
}
// add keys
keys.addAll(txnData.updatedItemsCache.keySet());
// remove keys
keys.removeAll(txnData.removedItemsCache);
} else {
// no transaction, so just use the backing cache
keys = (Collection) sharedCache.getKeys();
}
Collection<K> cacheKeys = new HashSet<K>(keys.size());
String currentCacheRegion = TenantUtil.getCurrentDomain();
for (Serializable key : keys) {
if (key instanceof CacheRegionKey) {
CacheRegionKey cacheRegionKey = (CacheRegionKey) key;
if (currentCacheRegion.equals(cacheRegionKey.getCacheRegion())) {
cacheKeys.add((K) cacheRegionKey.getCacheKey());
}
} else {
cacheKeys.add((K) key);
}
}
// done
return cacheKeys;
}
/**
* Transaction-long setting to force all the share cache to be bypassed for the current
* transaction.
*
* <p>This setting is like having a {@link NullCache null} {@link #setSharedCache(SimpleCache)
* shared cache}, but only lasts for the transaction.
*
* <p>Use this when a read transaction <b>must</b> see consistent and current data i.e. go to the
* database. While this is active, write operations will also not be committed to the shared
* cache.
*
* @param noSharedCacheRead <tt>true</tt> to avoid reading from the shared cache for the
* transaction
*/
@SuppressWarnings("unchecked")
public void setDisableSharedCacheReadForTransaction(boolean noSharedCacheRead) {
TransactionData txnData = getTransactionData();
// If we are switching on noSharedCacheRead mode, convert all existing reads and updates to
// avoid 'consistent
// read' behaviour giving us a potentially out of date node already accessed
if (noSharedCacheRead && !txnData.noSharedCacheRead) {
txnData.noSharedCacheRead = noSharedCacheRead;
String currentCacheRegion = TenantUtil.getCurrentDomain();
for (Map.Entry<Serializable, CacheBucket<V>> entry :
new ArrayList<Map.Entry<Serializable, CacheBucket<V>>>(
txnData.updatedItemsCache.entrySet())) {
Serializable cacheKey = entry.getKey();
K key = null;
if (cacheKey instanceof CacheRegionKey) {
CacheRegionKey cacheRegionKey = (CacheRegionKey) cacheKey;
if (currentCacheRegion.equals(cacheRegionKey.getCacheRegion())) {
key = (K) cacheRegionKey.getCacheKey();
}
} else {
key = (K) cacheKey;
}
if (key != null) {
CacheBucket<V> bucket = entry.getValue();
// Simply 'forget' reads
if (bucket instanceof ReadCacheBucket) {
txnData.updatedItemsCache.remove(cacheKey);
}
// Convert updates to removes
else if (bucket instanceof UpdateCacheBucket) {
remove(key);
}
// Leave new entries alone - they can't have come from the shared cache
}
}
}
}
