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using System; | |
using System.Threading.Tasks; | |
using Orleans; | |
using GrainInterfaces; | |
using Orleans.Concurrency; | |
namespace Grains | |
{ | |
public class CacheGrain<T>: Grain, ICacheGrain<T> | |
{ | |
Immutable<T> item = new Immutable<T>(default(T)); | |
TimeSpan timeToKeep = TimeSpan.Zero; | |
public Task Set(Immutable<T> item, TimeSpan timeToKeep) | |
{ | |
this.item = item; | |
this.timeToKeep = timeToKeep == TimeSpan.Zero ? TimeSpan.FromHours(2) : timeToKeep; | |
this.DelayDeactivation(timeToKeep); | |
return Task.FromResult(0); | |
} | |
public Task<Immutable<T>> Get() | |
{ | |
return Task.FromResult(this.item); | |
} | |
public Task Clear() | |
{ | |
this.DeactivateOnIdle(); | |
return Task.FromResult(0); | |
} | |
public Task Refresh() | |
{ | |
this.DelayDeactivation(timeToKeep); | |
return Task.FromResult(0); | |
} | |
} | |
} |
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using Orleans; | |
using System; | |
using System.Threading.Tasks; | |
using Orleans.Concurrency; | |
namespace GrainInterfaces | |
{ | |
public interface ICacheGrain<T> : IGrainWithStringKey | |
{ | |
Task Set(Immutable<T> item, TimeSpan timeToKeep); | |
Task<Immutable<T>> Get(); | |
Task Clear(); | |
Task Refresh(); | |
} | |
} |
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using GrainInterfaces; | |
using Microsoft.Extensions.Caching.Distributed; | |
using Orleans; | |
using Orleans.Concurrency; | |
using System; | |
using System.Threading.Tasks; | |
namespace Webapp.Services | |
{ | |
public class OrleansCache : IDistributedCache | |
{ | |
readonly IGrainFactory grainFactory; | |
public OrleansCache() | |
{ | |
this.grainFactory = GrainClient.GrainFactory; | |
} | |
public byte[] Get(string key) => this.GetAsync(key).Result; | |
public async Task<byte[]> GetAsync(string key) => (await this.grainFactory.GetGrain<ICacheGrain<byte[]>>(key).Get()).Value; | |
public void Refresh(string key) => this.RefreshAsync(key).Wait(); | |
public Task RefreshAsync(string key) => this.grainFactory.GetGrain<ICacheGrain<byte[]>>(key).Refresh(); | |
public void Remove(string key) => this.RefreshAsync(key).Wait(); | |
public Task RemoveAsync(string key) => this.grainFactory.GetGrain<ICacheGrain<byte[]>>(key).Clear(); | |
public void Set(string key, byte[] value, DistributedCacheEntryOptions options) => this.SetAsync(key, value, options).Wait(); | |
public Task SetAsync(string key, byte[] value, DistributedCacheEntryOptions options) | |
{ | |
var creationTime = DateTimeOffset.UtcNow; | |
var absoluteExpiration = GetAbsoluteExpiration(creationTime, options); | |
var expirationSeconds = GetExpirationInSeconds(creationTime, absoluteExpiration, options); | |
return this.grainFactory.GetGrain<ICacheGrain<byte[]>>(key).Set(new Immutable<byte[]>(value), TimeSpan.FromSeconds((double)(expirationSeconds ?? 0))); | |
} | |
private static long? GetExpirationInSeconds(DateTimeOffset creationTime, DateTimeOffset? absoluteExpiration, DistributedCacheEntryOptions options) | |
{ | |
// [ ... some time calculations ...] | |
} | |
private static DateTimeOffset? GetAbsoluteExpiration(DateTimeOffset creationTime, DistributedCacheEntryOptions options) | |
{ | |
// [ ... more time calculations ...] | |
} | |
} | |
} |
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Small nitpick: it seems that line #25 (
Remove
) should be implemented asthis.RemoveAsync
.// thanks for the nice article!