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Copy pathProcessInstanceCache.cs
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76 lines (69 loc) · 2.23 KB
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using System;
using System.Runtime.Caching;
namespace BPMNET.Core
{
public class ProcessInstanceCache<TKey, TProcessInstance>
where TKey : IEquatable<TKey>
where TProcessInstance : class, IProcessInstance<TKey>
{
private MemoryCache cache;
//private CacheItemPolicy _policy;
private readonly string prefix = "ProcIns";
private static CacheItemPolicy policy = new CacheItemPolicy();
private static ProcessInstanceCache<TKey, TProcessInstance> instance = null;
private static readonly object padlock = new object();
#region Constructor ...
public static ProcessInstanceCache<TKey, TProcessInstance> Instance
{
get
{
if (instance == null)
{
lock (padlock)
{
if (instance == null)
{
instance = new ProcessInstanceCache<TKey, TProcessInstance>();
}
}
}
return instance;
}
}
private ProcessInstanceCache()
{
cache = MemoryCache.Default;
}
#endregion
#region Sub Routine ...
private string getId(TKey id)
{
return prefix + id.ToString();
}
public virtual TProcessInstance GetById(TKey id)
{
TProcessInstance result = cache.Get(getId(id)) as TProcessInstance;
return result;
}
public virtual void Add(TProcessInstance item)
{
Check.ThrowIfNull(item);
Check.ThrowIfNull(item.ProcessInstanceId);
string key = getId(item.ProcessInstanceId);
cache.Add(key, item, policy);
}
public virtual void Set(TProcessInstance item)
{
Check.ThrowIfNull(item);
string key = getId(item.ProcessInstanceId);
cache.Set(key, item, policy);
}
public virtual void Remove(TProcessInstance item)
{
Check.ThrowIfNull(item);
string key = getId(item.ProcessInstanceId);
cache.Remove(key);
}
#endregion
}
}