/// <summary>
/// <see cref="ModuleHost"/> implements <see cref="IEventHandler"/> and exposes its methods so that a <see cref="IModule"/>
/// instance can check to see if an <see cref="IEvent"/> instance can be handled and pass it to <see cref="ModuleHost.Handle(IEvent)"/>
/// for handling. It is recommended to always use <see cref="IModuleHost"/> to handle events rather than invoking
/// <see cref="Module.Handle(IEvent)"/> directly. Invoking <see cref="Module.Handle(IEvent)"/> will create a ghost event
/// which will bee invisible to the <see cref="IModuleHost"/> and all other modules.
/// </summary>
public virtual void Handle(IEvent e)
{
// We generate a unique ID for the event and add it to the IEvent.Meta dictionary. This unique ID can be used to
// Track and monitor the event during the handling process through the exposed EventsInProgress property.
var id = GenerateEventId(e);
e.SetMetaValue("id", id);
lock (_EventsInProgress)
{
_EventsInProgress.Add(id, e);
}
// Added try/finally block to ensure that events that throw an exception are still removed from the EventsInProgress
// list. A try block without the catch will bubble any exceptions thrown.
try
{
// Pass the event over to the ModuleCollection for handling. This keeps things more readable in this class.
if (_ModuleCollection != null)
{
_ModuleCollection.Handle(e);
}
}
finally
{
// Once the event is completed we need to remove it from the EventsInProgress list.
lock (_EventsInProgress)
{
_EventsInProgress.Remove(id);
}
}
}
/// <summary>
/// <see cref="ModuleHost"/> implements <see cref="IEventHandler"/> and exposes its methods so that a <see cref="IModule"/>
/// instance can check to see if an <see cref="IEvent"/> instance can be handled and pass it to <see cref="ModuleHost.Handle(IEvent)"/>
/// for handling. It is recommended to always use <see cref="IModuleHost"/> to handle events rather than invoking
/// <see cref="Module.Handle(IEvent)"/> directly. Invoking <see cref="Module.Handle(IEvent)"/> will create a ghost event
/// which will bee invisible to the <see cref="IModuleHost"/> and all other modules.
/// </summary>
public virtual void Handle(IEvent e)
{
// We generate a unique ID for the event and add it to the IEvent.Meta dictionary. This unique ID can be used to
// Track and monitor the event during the handling process through the exposed EventsInProgress property.
var id = GenerateEventId(e);
e.SetMetaValue("id", id);
lock (_EventsInProgress)
{
_EventsInProgress.Add(id, e);
}
// Pass the event over to the ModuleCollection for handling. This keeps things more readable in this class.
_ModuleCollection.Handle(e);
// Once the event is completed we need to remove it from the EventsInProgress list.
lock (_EventsInProgress)
{
_EventsInProgress.Remove(id);
}
}
