/// <summary>
/// Attempts to get a value from cache.
/// If it is found in cache, return true, and the value.
/// If it is not found in cache, return false, and use the valueFactory callback to generate and return the value.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="value"></param>
/// <param name="valueFactory">A callback that can create the value.</param>
/// <returns>
/// True if the value came from cache, otherwise false.
/// </returns>
public bool TryGetOrAdd(TKey key, out TValue value, Func <TKey, TValue> valueFactory)
{
RedisValue redisValue;
RedisKey redisKey = GetRedisKey(key);
if (!_memoryStore.TryGetString(redisKey, out redisValue))
{
if (InnerCache != null)
{
bool cameFromCache = InnerCache.TryGetOrAdd(key, out value, valueFactory);
_memoryStore.StringSet(redisKey, GetRedisValue(key, value), KeyExpiry);
return(cameFromCache);
}
value = valueFactory(key);
_memoryStore.StringSet(redisKey, GetRedisValue(key, value), KeyExpiry);
return(false);
}
value = GetValue(redisValue);
return(true);
}
/// <summary>
/// Attempts to get a value from cache.
/// If it is found in cache, return true, and the value.
/// If it is not found in cache, return false, and use the valueFactory callback to generate and return the value.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
/// <param name="valueFactory">A callback that can create the value.</param>
/// <returns>
/// True if the value came from cache, otherwise false.
/// </returns>
public bool TryGetOrAdd(TKey key, out TValue value, Func <TKey, TValue> valueFactory)
{
if (valueFactory == null)
{
throw new ArgumentNullException(nameof(valueFactory));
}
bool cameFromCache = InnerCache.TryGetOrAdd(key, out value, valueFactory);
if (cameFromCache)
{
Interlocked.Increment(ref _hits);
}
else
{
Interlocked.Increment(ref _misses);
IncrementCount();
MetricReporter.NotifySizeChange(Name);
}
MetricReporter.NotifyHitsAndMissesChange(Name);
return(cameFromCache);
}
/// <summary>
/// Attempts to get a value from cache.
/// If it is found in cache, return true, and the value.
/// If it is not found in cache, return false, and use the valueFactory callback to generate and return the value.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
/// <param name="valueFactory">A callback that can create the value.</param>
/// <returns>
/// True if the value came from cache, otherwise false.
/// </returns>
public bool TryGetOrAdd(TKey key, out TValue value, Func <TKey, TValue> valueFactory)
{
return(InnerCache.TryGetOrAdd(key, out value, valueFactory));
}