public override void AddOrUpdate(TKey key, TValue value, ICacheExpirationPolicy expirationPolicy, string regionName = null)
{
_regions.Set(key, new CacheEntry <TKey, TValue>(key, expirationPolicy)
{
Value = value
}, regionName);
}
public CachedValue(ICache <TKey, TValue> cache, TKey key, Func <TValue> getValue, ICacheExpirationPolicy expirationPolicy, string regionName = null)
{
_cachedValueMode = CachedValueMode.GetOrAdd;
_cache = cache;
_key = key;
_getValue = getValue;
_expirationPolicy = expirationPolicy;
_regionName = regionName;
}
public bool TryMerge(ICacheExpirationPolicy toMerge)
{
var obj = toMerge as SlidingExpirationPolicy;
if (obj == null)
{
return(false);
}
_toUpdate = obj._toUpdate;
return(true);
}
public bool TryMerge(ICacheExpirationPolicy toMerge)
{
var obj = toMerge as AbsoluteExpirationPolicy;
if (obj == null)
{
return(false);
}
_expireIn = obj._expireIn;
return(true);
}
public override TValue GetOrAdd(TKey key, Func <TValue> getValue, ICacheExpirationPolicy expirationPolicy, string regionName = null)
{
if (TryGet(key, out var value, regionName))
{
return(value);
}
var newValue = getValue();
AddOrUpdate(key, newValue, expirationPolicy, regionName);
return(newValue);
}
public bool TryMerge(ICacheExpirationPolicy toMerge)
{
if (toMerge == null)
{
return(true);
}
foreach (var fileCacheExpirationPolicy in _policies)
{
if (fileCacheExpirationPolicy.TryMerge(toMerge))
{
return(true);
}
}
_policies.Add(toMerge);
return(true);
}
private async Task InternalAddOrUpdate(TKey key, CFileSource src, CancellationToken token, ICacheExpirationPolicy policy)
{
//at this point we are not responsible of disposing 'src' cause it's lifetime is wider than this method
var path = await UploadToCacheAsync(src, token);
_entries[key] = new CFileCacheEntry()
{
Created = DateTime.UtcNow,
FilePath = path
}.Pulse(policy);
}
public CacheEntry(TKey key, ICacheExpirationPolicy expirationPolicy)
{
Key = key;
ExpirationPolicy = expirationPolicy;
_lastEntryCheck = DateTime.Now;
}
public abstract Task AddOrUpdateAsync(TKey key, TValue value, ICacheExpirationPolicy expirationPolicy, string regionName = null);
public abstract Task <TValue> GetOrAddAsync(TKey key, Func <TValue> getValue,
ICacheExpirationPolicy expirationPolicy, string regionName = null);
public void Dispose()
{
Item = null;
ExpirationPolicy = null;
}
public ItemPolicyPair(object item, ICacheExpirationPolicy expirationPolicy)
{
Item = item;
ExpirationPolicy = expirationPolicy;
}
public void GetFileOrAddFile(TKey key, Func <TKey, string> provider, CancellationToken token, string targetFilePath, ICacheExpirationPolicy policy)
{
NotNull(provider, nameof(provider));
NotNull(key, nameof(key));
NotNull(targetFilePath, nameof(targetFilePath));
EnsureInitialized(token);
using (GlobalReadLock(token))
{
var entry = InternalGetOrAdd(key, kk => new CFileSource(provider(kk), _fs), token, policy);
using (var cfs = new CFileSource(entry.FilePath, _fs))
{
cfs.CopyTo(targetFilePath, token, true);
}
}
}
public async Task AddOrUpdateStreamAsync(TKey key, Stream stream, CancellationToken token, ICacheExpirationPolicy policy, bool leaveOpen = false)
{
NotNull(stream, nameof(stream));
NotNull(key, nameof(key));
using (var cfs = new CFileSource(stream, leaveOpen, _fs))
{
await EnsureInitializedAsync(token);
using (await GlobalReadLock(token))
{
await InternalAddOrUpdate(key, cfs, token, policy);
}
}
}
public override Task <TValue> GetOrAddAsync(TKey key, Func <TValue> getValue, ICacheExpirationPolicy expirationPolicy, string regionName = null)
{
return(Task.FromResult(GetOrAdd(key, getValue, expirationPolicy, regionName)));
}
/// <summary>
/// Updates policy and registers access.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="policy"></param>
/// <param name="otherPolicy"></param>
/// <returns></returns>
internal static T Pulse <T>(this T policy, ICacheExpirationPolicy otherPolicy) where T : ICacheExpirationPolicy
{
policy.TryMerge(otherPolicy);
policy.LogAccess(DateTime.UtcNow);
return(policy);
}
private async Task <CFileCacheEntry> InternalGetOrAdd(TKey key, Func <TKey, Task <CFileSource> > provider, CancellationToken token, ICacheExpirationPolicy policy)
{
CFileCacheEntry cacheEntry;
if (_entries.TryGetValue(key, out cacheEntry))
{
return(cacheEntry.Pulse(policy));
}
//per key mutex required to avoid multiple file upload to cache by same key.
//files are very large objects, so unnecessary actions with them should be avoided if possible.
using (await _perKeyLock.LockAsync(key, token))
{
if (_entries.TryGetValue(key, out cacheEntry))
{
return(cacheEntry.Pulse(policy));
}
token.ThrowIfCancellationRequested();
//we are responsible for creation and disposing of stream we created, so we wrap src in using directive.
using (var src = await provider(key))
{
token.ThrowIfCancellationRequested();
var path = await UploadToCacheAsync(src, token);
cacheEntry = new CFileCacheEntry()
{
Created = DateTime.UtcNow,
FilePath = path
};
//######
_entries[key] = cacheEntry;
return(cacheEntry.Pulse(policy));
}
}
}
public async Task GetFileOrAddFileAsync(TKey key, Func <TKey, Task <string> > provider, CancellationToken token, string targetFilePath, ICacheExpirationPolicy policy)
{
NotNull(provider, nameof(provider));
NotNull(key, nameof(key));
NotNull(targetFilePath, nameof(targetFilePath));
await EnsureInitializedAsync(token);
using (await GlobalReadLock(token))
{
var entry = await InternalGetOrAdd(key, async kk => new CFileSource(await provider(kk), _fs), token, policy);
using (var cfs = new CFileSource(entry.FilePath, _fs))
{
await cfs.CopyToAsync(targetFilePath, token, true);
}
}
}
public async Task <Stream> GetStreamOrAddFileAsync(TKey key, Func <TKey, Task <string> > provider, CancellationToken token, ICacheExpirationPolicy policy)
{
NotNull(provider, nameof(provider));
NotNull(key, nameof(key));
await EnsureInitializedAsync(token);
using (await GlobalReadLock(token))
{
var entry = await InternalGetOrAdd(key, async kk => new CFileSource(await provider(kk), _fs), token, policy);
return(await _fs.OpenReadAsync(entry.FilePath, token));
}
}
public Stream GetStreamOrAddFile(TKey key, Func <TKey, string> provider, CancellationToken token, ICacheExpirationPolicy policy)
{
NotNull(provider, nameof(provider));
NotNull(key, nameof(key));
EnsureInitialized(token);
using (GlobalReadLock(token))
{
var entry = InternalGetOrAdd(key, kk => new CFileSource(provider(kk), _fs), token, policy);
return(_fs.OpenRead(entry.FilePath, token));
}
}
public async Task AddOrUpdateFileAsync(TKey key, string sourceFilePath, CancellationToken token, ICacheExpirationPolicy policy)
{
NotNull(sourceFilePath, nameof(sourceFilePath));
NotNull(key, nameof(key));
using (var cfs = new CFileSource(sourceFilePath, _fs))
{
await EnsureInitializedAsync(token);
using (await GlobalReadLock(token))
{
await InternalAddOrUpdate(key, cfs, token, policy);
}
}
}
public override Task AddOrUpdateAsync(TKey key, TValue value, ICacheExpirationPolicy expirationPolicy, string regionName = null)
{
AddOrUpdate(key, value, expirationPolicy, regionName);
return(Task.CompletedTask);
}
public ItemPolicyPair(object item, ICacheExpirationPolicy expirationPolicy)
{
Item = item;
ExpirationPolicy = expirationPolicy;
}
public void Put(object key, object item, ICacheExpirationPolicy expirationPolicy)
{
expirationPolicy.SetProvider(this);
Cache[key] = new ItemPolicyPair(item, expirationPolicy);
expirationPolicy.ItemAdded(key, item);
}
