/// <summary>
/// Gets the value with the specified key if it exists, or creates it if it doesn't.
/// </summary>
/// <typeparam name="T">Type of the value that was saved</typeparam>
public static T GetOrAdd <T>(this IKeyValueStore kvStore, string key, Func <T> valueFactory)
{
if (kvStore.Exists(key))
{
return(kvStore.Get <T>(key));
}
var value = valueFactory();
kvStore.Set(key, value);
return(value);
}
internal virtual bool GraphNodeExists(Identity id)
{
var exists = _storage.Exists(id);
if (exists == false && _lazyLoader != null)
{
// Lazy loading
LoadNodes(new Query {
SingleId = id
}, MergeOption.AppendOnly, _lazyLoader, true).Wait();
}
return(exists);
}
public override bool IsDeleted(Identity id)
{
return(_deletedElements.Exists(id));
}
public bool ContainsBlockStates(HashDigest <SHA256> blockHash)
{
return(_stateHashKeyValueStore.Exists(blockHash.ToByteArray()));
}
public bool Exists(byte[] key)
{
return(_cache.ContainsKey(key) || _keyValueStore.Exists(key));
}
