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POShare first level cache between different sessions?
 

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  1. POShare first level cache between different sessions?
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    <p>Is it possible for different NHibernate sessions to share one 1st level cache? I`ve tried to implement it using interceptors and listeners. All works fine except Session.Evict().</p> <pre><code>public class SharedCache : EmptyInterceptor, IFlushEntityEventListener, ILoadEventListener, IEvictEventListener, ISharedCache { [ThreadStatic] private readonly Dictionary&lt;string, Dictionary&lt;object, object&gt;&gt; cache; private ISessionFactory factory; public SharedCache() { this.cache = new Dictionary&lt;string, Dictionary&lt;object, object&gt;&gt;(); } public override object Instantiate(string clazz, EntityMode entityMode, object id) { var entityCache = this.GetCache(clazz); if (entityCache.ContainsKey(id)) return entityCache[id]; var entity = Activator.CreateInstance(Type.GetType(clazz)); this.factory.GetClassMetadata(clazz).SetIdentifier(entity, id, entityMode); return entity; } private Dictionary&lt;object, object&gt; GetCache(string clazz) { if (!cache.ContainsKey(clazz)) cache.Add(clazz, new Dictionary&lt;object, object&gt;()); return cache[clazz]; } public void Configure(Configuration config) { config.SetInterceptor(this); config.SetListener(ListenerType.FlushEntity, this); config.SetListener(ListenerType.Load, this); config.SetListener(ListenerType.Evict, this); } public void Initialize(ISessionFactory sessionFactory) { this.factory = sessionFactory; } public void OnFlushEntity(FlushEntityEvent ev) { var entry = ev.EntityEntry; var entityCache = this.GetCache(ev.EntityEntry.EntityName); if (entry.Status == Status.Deleted) { entityCache.Remove(entry.Id); return; } if (!entry.ExistsInDatabase &amp;&amp; !entityCache.ContainsKey(entry.Id)) entityCache.Add(entry.Id, ev.Entity); } public void OnLoad(LoadEvent ev, LoadType loadType) { var entityCache = this.GetCache(ev.EntityClassName); if (entityCache.ContainsKey(ev.EntityId)) ev.Result = entityCache[ev.EntityId]; } public void OnEvict(EvictEvent ev) { var entityName = ev.Session.GetEntityName(ev.Entity); var entityCache = this.GetCache(entityName); var id = ev.Session.GetIdentifier(ev.Entity); entityCache.Remove(id); } } </code></pre>
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      1. USBeatles1692
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      1. USMichael Buen
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    1. COwhy ?
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      1. USMauricio Scheffer
    2. COGenerally bacause of nhibernate sessions are not thread safe. So one should open session in each thread. But also first level cache is required. So I decided to create my own first level cache across sessions.
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    3. COIf you need a cross-session cache, why don't you use the 2nd-level cache?
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      1. USMauricio Scheffer
 

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