public void Depacketize(IReadablePacket packet)
{
// Read the list of commands for the next frame.
Commands.Clear();
foreach (var command in packet.ReadPacketizablesWithTypeInfo <Command>())
{
PushCommand(command);
}
}
/// <summary>
/// Reads an entity from the specified packet, meaning all its components. This will create a new entity, with an id
/// that may differ from the id the entity had when it was written.
/// <para/>
/// In particular, all re-created components will likely have different different ids as well, so this method is not
/// suited for storing components that reference other components, even if just by their ID.
/// <para/>
/// This will act as though all of the written components were added, i.e. for each restored component a
/// <see cref="ComponentAdded"/> message will be sent.
/// <para/>
/// This uses the components' serialization facilities.
/// </summary>
/// <param name="packet">The packet to read the entity from.</param>
/// <param name="componentIdMap">A mapping of how components' ids changed due to serialization, mapping old id to new id.</param>
/// <returns>The id of the read entity.</returns>
public int DepacketizeEntity(IReadablePacket packet, Dictionary <int, int> componentIdMap = null)
{
// Keep track of what we already did, to allow unwinding if something
// bad happens. Then get an entity id and try to read the components.
var undo = new Stack <Action>();
var entity = AddEntity();
undo.Push(() => RemoveEntity(entity));
try
{
// Read all components that were written for this entity. This
// does not yet mess with our internal state.
var components = packet.ReadPacketizablesWithTypeInfo <Component>();
// Now we need to inject the components into our system, so we assign
// an id to each one and link it to our entity id.
foreach (var component in components)
{
// Link stuff together.
var id = _componentIds.GetId();
if (componentIdMap != null)
{
componentIdMap.Add(component.Id, id);
}
component.Id = id;
component.Entity = entity;
component.Manager = this;
_components[component.Id] = component;
// Add to entity index.
_entities[entity].Add(component);
// Push to undo queue in case a message handler throws.
undo.Push(() => RemoveComponent(id));
// Send a message to all systems.
ComponentAdded message;
message.Component = component;
SendMessage(message);
}
// Yay, all went well. Return the id of the read entity.
return(entity);
}
catch (Exception)
{
// Undo all we did.
while (undo.Count > 0)
{
undo.Pop()();
}
throw;
}
}
public void Depacketize(IReadablePacket packet)
{
// Unwrap the trailing state and mirror it to all the newer ones.
packet.ReadPacketizableInto(_simulations[_simulations.Length - 1]);
MirrorSimulation(_simulations[_simulations.Length - 1], _simulations.Length - 2);
// Find adds / removes / commands that our out of date now, but keep
// newer ones (that might be locally generated).
PrunePastEvents();
// Continue with reading the list of removes.
var removeCount = packet.ReadInt32();
for (var removeIndex = 0; removeIndex < removeCount; ++removeIndex)
{
var key = packet.ReadInt64();
if (!_removes.ContainsKey(key))
{
_removes.Add(key, new List <int>());
}
var valueCount = packet.ReadInt32();
for (var valueIndex = 0; valueIndex < valueCount; ++valueIndex)
{
_removes[key].Add(packet.ReadInt32());
}
}
// And finally the commands.
var commandCount = packet.ReadInt32();
for (var commandIndex = 0; commandIndex < commandCount; ++commandIndex)
{
var key = packet.ReadInt64();
if (!_commands.ContainsKey(key))
{
_commands.Add(key, new List <Command>());
}
_commands[key].AddRange(packet.ReadPacketizablesWithTypeInfo <Command>());
}
// Got a valid state.
WaitingForSynchronization = false;
}