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Ahmed Zamil
427
Esiur/Resource/Instance.cs
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427
Esiur/Resource/Instance.cs
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using Esiur.Data;
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using System.Runtime.CompilerServices;
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using System.Reflection;
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using Esiur.Net.IIP;
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using Esiur.Misc;
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using Esiur.Security.Permissions;
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using Esiur.Resource.Template;
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namespace Esiur.Resource
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{
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public class Instance
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{
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string name;
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AutoList<IResource, Instance> children;// = new AutoList<IResource, Instance>();
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IResource resource;
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IStore store;
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AutoList<IResource, Instance> parents;// = new AutoList<IResource>();
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bool inherit;
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ResourceTemplate template;
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AutoList<IPermissionManager, Instance> managers;// = new AutoList<IPermissionManager, Instance>();
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public delegate void ResourceModifiedEvent(IResource resource, string propertyName, object newValue, object oldValue);
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public delegate void ResourceEventOccurredEvent(IResource resource, string eventName, string[] receivers, object[] args);
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public delegate void ResourceDestroyedEvent(IResource resource);
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public event ResourceModifiedEvent ResourceModified;
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public event ResourceEventOccurredEvent ResourceEventOccured;
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public event ResourceDestroyedEvent ResourceDestroyed;
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KeyList<string, object> attributes = new KeyList<string, object>();
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List<uint> ages = new List<uint>();
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private uint age;
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uint id;
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/// <summary>
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/// Instance attributes are custom properties associated with the instance, a place to store information by IStore.
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/// </summary>
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public KeyList<string, object> Attributes
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{
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get
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{
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return attributes;
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}
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}
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/// <summary>
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/// Get the age of a given property index.
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/// </summary>
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/// <param name="index">Zero-based property index.</param>
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/// <returns>Age.</returns>
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public uint GetAge(byte index)
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{
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if (index < ages.Count)
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return ages[index];
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else
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return 0;
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}
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/// <summary>
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/// Age of the instance, increments by 1 in every modification.
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/// </summary>
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public uint Age
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{
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get { return age; }
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internal set { age = value; }
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}
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/// <summary>
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/// Instance Id.
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/// </summary>
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public uint Id
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{
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get { return id; }
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}
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/// <summary>
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/// Import properties from bytes array.
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/// </summary>
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/// <param name="properties"></param>
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/// <returns></returns>
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public bool Deserialize(object[] properties)
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{
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foreach (var pt in template.Properties)
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{
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#if NETSTANDARD1_5
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var pi = resource.GetType().GetTypeInfo().GetProperty(pt.Name);
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#else
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var pi = resource.GetType().GetProperty(pt.Name);
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#endif
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if (!(properties[pt.Index] is NotModified))
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pi.SetValue(resource, properties[pt.Index]);
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}
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return true;
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}
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/// <summary>
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/// Export all properties with ResourceProperty attributed as bytes array.
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/// </summary>
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/// <returns></returns>
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public object[] Serialize()
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{
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List<object> props = new List<object>();
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foreach (var pt in template.Properties)
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{
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#if NETSTANDARD1_5
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var pi = resource.GetType().GetTypeInfo().GetProperty(pt.Name);
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#else
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var pi = resource.GetType().GetProperty(pt.Name);
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#endif
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var rt = pi.GetValue(resource, null);
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props.Add(rt);
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}
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return props.ToArray();
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}
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/*
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public bool Deserialize(byte[] data, uint offset, uint length)
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{
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var props = Codec.ParseValues(data, offset, length);
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Deserialize(props);
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return true;
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}
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*/
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/*
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public byte[] Serialize(bool includeLength = false, DistributedConnection sender = null)
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{
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//var bl = new BinaryList();
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List<object> props = new List<object>();
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foreach (var pt in template.Properties)
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{
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var pi = resource.GetType().GetProperty(pt.Name);
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var rt = pi.GetValue(resource, null);
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// this is a cool hack to let the property know the sender
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if (rt is Func<DistributedConnection, object>)
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rt = (rt as Func<DistributedConnection, object>)(sender);
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props.Add(rt);
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}
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if (includeLength)
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{
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return Codec.Compose(props.ToArray(), false);
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}
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else
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{
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var rt = Codec.Compose(props.ToArray(), false);
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return DC.Clip(rt, 4, (uint)(rt.Length - 4));
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}
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}
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public byte[] StorageSerialize()
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{
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var props = new List<object>();
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foreach(var pt in template.Properties)
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{
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if (!pt.Storable)
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continue;
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var pi = resource.GetType().GetProperty(pt.Name);
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if (!pi.CanWrite)
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continue;
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var rt = pi.GetValue(resource, null);
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props.Add(rt);
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}
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return Codec.Compose(props.ToArray(), false);
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}
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*/
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/// <summary>
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/// If True, the instance can be stored to disk.
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/// </summary>
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/// <returns></returns>
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public bool IsStorable()
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{
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#if NETSTANDARD1_5
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var attrs = resource.GetType().GetTypeInfo().GetCustomAttributes(typeof(Storable), true).ToArray();
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#else
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var attrs = resource.GetType().GetCustomAttributes(typeof(Storable), true);
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#endif
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return attrs.Length > 0;
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}
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/// <summary>
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/// Notify listeners that a property was modified.
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/// </summary>
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/// <param name="propertyName"></param>
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/// <param name="newValue"></param>
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/// <param name="oldValue"></param>
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public void Modified([CallerMemberName] string propertyName = "", object newValue = null, object oldValue = null)
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{
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if (newValue == null)
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{
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object val;
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if (GetPropertyValue(propertyName, out val))
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ResourceModified?.Invoke(resource, propertyName, val, oldValue);
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}
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else
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ResourceModified?.Invoke(resource, propertyName, newValue, oldValue);
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}
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internal void EmitResourceEvent(string name, string[] receivers, object[] args)
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{
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ResourceEventOccured?.Invoke(resource, name, receivers, args);
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}
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/// <summary>
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/// Get the value of a given property by name.
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/// </summary>
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/// <param name="name">Property name</param>
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/// <param name="value">Output value</param>
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/// <returns>True, if the resource has the property.</returns>
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public bool GetPropertyValue(string name, out object value)
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{
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#if NETSTANDARD1_5
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PropertyInfo pi = resource.GetType().GetTypeInfo().GetProperty(name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly);
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#else
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PropertyInfo pi = resource.GetType().GetProperty(name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly);
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#endif
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if (pi != null)
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{
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#if NETSTANDARD1_5
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object[] ca = pi.GetCustomAttributes(typeof(ResourceProperty), false).ToArray();
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#else
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object[] ca = pi.GetCustomAttributes(typeof(ResourceProperty), false);
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#endif
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if (ca.Length > 0)
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{
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value = pi.GetValue(resource, null);
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//if (value is Func<IManager, object>)
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// value = (value as Func<IManager, object>)(sender);
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return true;
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}
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}
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value = null;
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return false;
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}
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public bool Inherit
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{
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get { return inherit; }
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}
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/// <summary>
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/// List of parents.
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/// </summary>
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public AutoList<IResource, Instance> Parents
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{
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get { return parents; }
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}
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/// <summary>
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/// Store responsible for creating and keeping the resource.
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/// </summary>
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public IStore Store
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{
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get { return store; }
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}
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/// <summary>
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/// List of children.
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/// </summary>
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public AutoList<IResource, Instance> Children
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{
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get { return children; }
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}
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/// <summary>
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/// The unique and permanent link to the resource.
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/// </summary>
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public string Link
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{
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get
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{
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if (this.store != null)
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return this.store.Link(this.resource);
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else
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{
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var l = new List<string>();
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//l.Add(name);
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var p = this.resource; // parents.First();
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while (true)
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{
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l.Insert(0, p.Instance.name);
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if (p.Instance.parents.Count == 0)
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break;
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p = p.Instance.parents.First();
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}
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return String.Join("/", l.ToArray());
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}
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}
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}
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/// <summary>
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/// Instance name.
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/// </summary>
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public string Name
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{
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get { return name; }
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}
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/// <summary>
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/// Resource managed by this instance.
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/// </summary>
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public IResource Resource
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{
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get { return resource; }
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}
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/// <summary>
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/// Resource template describes the properties, functions and events of the resource.
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/// </summary>
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public ResourceTemplate Template
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{
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get { return template; }
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}
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/// <summary>
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/// Create new instance.
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/// </summary>
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/// <param name="id">Instance Id.</param>
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/// <param name="name">Name of the instance.</param>
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/// <param name="resource">Resource to manage.</param>
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/// <param name="store">Store responsible for the resource.</param>
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public Instance(uint id, string name, IResource resource, IStore store)
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{
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this.store = store;
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this.resource = resource;
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this.id = id;
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this.name = name;
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children = new AutoList<IResource, Instance>(this);
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parents = new AutoList<IResource, Instance>(this);
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managers = new AutoList<IPermissionManager, Instance>(this);
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children.OnAdd += Children_OnAdd;
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children.OnRemoved += Children_OnRemoved;
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resource.OnDestroy += Resource_OnDestroy;
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template = Warehouse.GetTemplate(resource.GetType());
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// set ages
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for (byte i = 0; i < template.Properties.Length; i++)
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ages.Add(0);
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// connect events
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Type t = resource.GetType();
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#if NETSTANDARD1_5
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var events = t.GetTypeInfo().GetEvents(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly);
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#else
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var events = t.GetEvents(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly);
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#endif
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foreach (var evt in events)
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{
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if (evt.EventHandlerType != typeof(ResourceEventHanlder))
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continue;
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var ca = (ResourceEvent[])evt.GetCustomAttributes(typeof(ResourceEvent), true);
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if (ca.Length == 0)
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continue;
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ResourceEventHanlder proxyDelegate = (receivers, args) => EmitResourceEvent(evt.Name, receivers, args);
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evt.AddEventHandler(resource, proxyDelegate);
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}
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}
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private void Children_OnRemoved(Instance parent, IResource value)
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{
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value.Instance.parents.Remove(resource);
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}
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private void Children_OnAdd(Instance parent, IResource value)
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{
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value.Instance.parents.Add(resource);
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}
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private void Resource_OnDestroy(object sender)
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{
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ResourceDestroyed?.Invoke((IResource)sender);
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}
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}
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}
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