@Override
public void validateIfLocked(final ILockKey context, Optional<ILock> heldLock)
throws LockException {
Optional<ILock> stored =
storage.read(storeProvider -> storeProvider.getLockStore().fetchLock(context));
// The implementation below assumes the following use cases:
// +-----------+-----------------+----------+
// | eq | held | not held |
// +-----------+-----------------+----------+
// |stored |(stored == held)?| invalid |
// +-----------+-----------------+----------+
// |not stored | invalid | valid |
// +-----------+-----------------+----------+
if (!stored.equals(heldLock)) {
if (stored.isPresent()) {
throw new LockException(
String.format(
"Unable to perform operation for: %s. Use override/cancel option.",
formatLockKey(context)));
} else if (heldLock.isPresent()) {
throw new LockException(
String.format("Invalid operation context: %s", formatLockKey(context)));
}
}
}
/**
* Computes total quota allocations.
*
* @return Total allocated quota.
* @throws StorageException if there was a problem fetching quotas from storage.
*/
public Metric computeQuotaAllocationTotals() throws StorageException {
return storage.read(
storeProvider -> {
Metric allocation = new Metric();
for (IResourceAggregate quota : storeProvider.getQuotaStore().fetchQuotas().values()) {
allocation.accumulate(quota);
}
return allocation;
});
}
@Override
public Iterable<ILock> getLocks() {
return storage.read(storeProvider -> storeProvider.getLockStore().fetchLocks());
}