/// <summary>
/// Store an object into storage, with the current node as the owner.
/// </summary>
/// <param name="id">
/// The unique identifier of the object.
/// </param>
/// <param name="data">
/// The object itself.
/// </param>
public void Store(string id, object data)
{
this.AssertBound();
var objectStorage = this.GetService <IObjectStorage>();
objectStorage.Put(new LiveEntry {
Key = ID.NewHash(id), Value = data, Owner = this.Self
});
}
public object GetProperty(string id, string property)
{
this.AssertBound();
var messageConstructor = this.GetService <IMessageConstructor>();
var objectWithTypeSerializer = this.GetService <IObjectWithTypeSerializer>();
var automaticRetry = this.GetService <IAutomaticRetry>();
var entry = this.GetHandlerAndObjectByID(id);
var obj = entry.Value;
if (this.Architecture == Architecture.PeerToPeer && entry.Owner != this.Self)
{
// We need to request the value from the node that owns it.
var getMessage = messageConstructor.ConstructGetPropertyMessage(ID.NewHash(id), property);
var message = automaticRetry.SendWithRetry(
entry.ClientHandler,
getMessage,
x => x.Type == MessageType.GetPropertyResult && x.GetPropertyMessageID == getMessage.ID,
this.Timeout,
this.Retries);
return(objectWithTypeSerializer.Deserialize(message.GetPropertyResult));
}
if (this.Architecture == Architecture.ServerClient)
{
if (!this.IsServer && this.Caching != Caching.PushOnChange)
{
// We are the client, but we need to request the value
// from the server.
var getMessage = messageConstructor.ConstructGetPropertyMessage(ID.NewHash(id), property);
var message = automaticRetry.SendWithRetry(
entry.ClientHandler,
getMessage,
x => x.Type == MessageType.GetPropertyResult && x.GetPropertyMessageID == getMessage.ID,
this.Timeout,
this.Retries);
return(objectWithTypeSerializer.Deserialize(message.GetPropertyResult));
}
}
var mi = obj.GetType().GetMethod("get_" + property + "__Distributed0", BindingFlagsCombined.All);
if (mi == null)
{
throw new MissingMethodException(obj.GetType().FullName, "get_" + property + "__Distributed0");
}
return(DpmEntrypoint.InvokeDynamic(obj.GetType(), mi, obj, new Type[0], new object[] { }));
}
/// <summary>
/// Fetch an object from storage.
/// </summary>
/// <param name="id">
/// The unique identifier of the object.
/// </param>
/// <returns>
/// The object, or null if none was found.
/// </returns>
public object Fetch(string id)
{
this.AssertBound();
var objectLookup = this.GetService <IObjectLookup>();
var entry = objectLookup.GetFirst(ID.NewHash(id), 60000);
if (entry == null)
{
return(null);
}
return(entry.Value);
}
/// <summary>
/// Retrieve the client handler, owner and live object based on the
/// specified object's ID.
/// </summary>
/// <param name="id">
/// The id of the object to retrieve.
/// </param>
/// <returns>
/// The <see cref="ObjectEntry"/>.
/// </returns>
/// <exception cref="NullReferenceException">
/// The object could not be found.
/// </exception>
/// <exception cref="InvalidOperationException">
/// The client owning the object could not be found.
/// </exception>
private ObjectEntry GetHandlerAndObjectByID(string id)
{
var objectLookup = this.GetService <IObjectLookup>();
var clientLookup = this.GetService <IClientLookup>();
var entry = objectLookup.GetFirst(ID.NewHash(id), 60000);
if (entry == null)
{
throw new NullReferenceException();
}
var clientHandler = clientLookup.Lookup(entry.Owner.IPEndPoint);
if (clientHandler == null)
{
throw new InvalidOperationException();
}
return(new ObjectEntry {
ClientHandler = clientHandler, Owner = entry.Owner, Value = entry.Value
});
}
public void SetProperty(string id, string property, object value)
{
this.AssertBound();
var objectStorage = this.GetService <IObjectStorage>();
var clientLookup = this.GetService <IClientLookup>();
var messageConstructor = this.GetService <IMessageConstructor>();
var automaticRetry = this.GetService <IAutomaticRetry>();
var entry = this.GetHandlerAndObjectByID(id);
var obj = entry.Value;
var mi = obj.GetType().GetMethod("set_" + property + "__Distributed0", BindingFlagsCombined.All);
if (mi == null)
{
throw new MissingMethodException(obj.GetType().FullName, "set_" + property + "__Distributed0");
}
if (this.Architecture == Architecture.PeerToPeer)
{
if (entry.Owner == this.Self)
{
DpmEntrypoint.InvokeDynamic(obj.GetType(), mi, obj, new Type[0], new[] { value });
objectStorage.UpdateOrPut(new LiveEntry {
Key = ID.NewHash(id), Value = obj, Owner = this.Self
});
return;
}
var clientHandler = clientLookup.Lookup(entry.Owner.IPEndPoint);
var setPropertyMessage = messageConstructor.ConstructSetPropertyMessage(ID.NewHash(id), property, value);
automaticRetry.SendWithRetry(
clientHandler,
setPropertyMessage,
x =>
x.Type == MessageType.SetPropertyConfirmation && x.SetPropertyMessageID == setPropertyMessage.ID,
this.Timeout,
this.Retries);
return;
}
if (this.Architecture == Architecture.ServerClient)
{
// If we are a client, we can't set properties.
if (!this.IsServer)
{
throw new MemberAccessException("Only servers may set the '" + property + "' property.");
}
DpmEntrypoint.InvokeDynamic(obj.GetType(), mi, obj, new Type[0], new[] { value });
objectStorage.UpdateOrPut(new LiveEntry {
Key = ID.NewHash(id), Value = obj, Owner = this.Self
});
if (this.Caching == Caching.PushOnChange)
{
// We need to push the new value out to clients.
foreach (var client in clientLookup.GetAll().Where(x => !object.Equals(x.Key, this.Self.IPEndPoint)))
{
client.Value.Send(
messageConstructor.ConstructSetPropertyMessage(ID.NewHash(id), property, value));
}
}
return;
}
throw new NotSupportedException();
}
public object Invoke(string id, string method, Type[] targs, object[] args)
{
this.AssertBound();
var messageConstructor = this.GetService <IMessageConstructor>();
var objectWithTypeSerializer = this.GetService <IObjectWithTypeSerializer>();
var automaticRetry = this.GetService <IAutomaticRetry>();
var entry = this.GetHandlerAndObjectByID(id);
var obj = entry.Value;
if (this.Architecture == Architecture.PeerToPeer)
{
// In peer-to-peer modes, methods are always invoked locally.
var mi = obj.GetType().GetMethod(method, BindingFlagsCombined.All);
if (mi == null)
{
throw new MissingMethodException(obj.GetType().FullName, method);
}
return(DpmEntrypoint.InvokeDynamic(obj.GetType(), mi, obj, targs, args));
}
if (this.Architecture == Architecture.ServerClient)
{
if (this.IsServer)
{
// The server is always permitted to call methods.
var mi = obj.GetType().GetMethod(method, BindingFlagsCombined.All);
if (mi == null)
{
throw new MissingMethodException(obj.GetType().FullName, method);
}
return(DpmEntrypoint.InvokeDynamic(obj.GetType(), mi, obj, targs, args));
}
else
{
// We must see if the client is permitted to call the specified method.
var mi = obj.GetType()
.GetMethod(method.Substring(0, method.IndexOf("__Distributed0", System.StringComparison.Ordinal)), BindingFlagsCombined.All);
if (mi == null)
{
throw new MissingMethodException(obj.GetType().FullName, method);
}
if (mi.GetCustomAttributes(typeof(ClientIgnorableAttribute), false).Count() != 0)
{
return(null);
}
if (!mi.GetCustomAttributes(typeof(ClientCallableAttribute), false).Any())
{
throw new MemberAccessException(
"The method '" + method + "' is not accessible to client machines.");
}
// If we get to here, then we're permitted to call the method, but we still need
// to remote it to the server.
var invokeMessage = messageConstructor.ConstructInvokeMessage(ID.NewHash(id), method, targs, args);
var message = automaticRetry.SendWithRetry(
entry.ClientHandler,
invokeMessage,
x => x.Type == MessageType.InvokeResult && x.InvokeMessageID == invokeMessage.ID,
this.Timeout,
this.Retries);
return(objectWithTypeSerializer.Deserialize(message.InvokeResult));
}
}
throw new NotSupportedException();
}