I need a thread safe class for File System Watcher to use in Unity Editor, I already know that Threading is not possible out of coroutines, but I didn't know that threading wasn't allowed also in Editor.
So, there is my error:
get_isEditor can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene. Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function. 0x0000000140E431ED (Unity) StackWalker::GetCurrentCallstack 0x0000000140E44EE1 (Unity) StackWalker::ShowCallstack 0x00000001405FC603 (Unity) GetStacktrace 0x00000001405F97FE (Unity) DebugStringToFile 0x00000001405F9C5C (Unity) DebugStringToFile 0x000000014035F7B3 (Unity) ThreadAndSerializationSafeCheckReportError 0x0000000140E7B988 (Unity) Application_Get_Custom_PropIsEditor 0x0000000015AC46AA (Mono JIT Code) (wrapper managed-to-native) UnityEngine.Application:get_isEditor () 0x0000000015AC42FE (Mono JIT Code) [Helpers.cs:585] Lerp2API.DebugHandler.Debug:Log (object) 0x0000000015AC41C2 (Mono JIT Code) [Helpers.cs:578] Lerp2API.DebugHandler.Debug:Log (string) 0x0000000015AC40F7 (Mono JIT Code) [LerpedEditorCore.cs:101] Lerp2APIEditor.LerpedEditorCore:Recompile (object,System.IO.FileSystemEventArgs) 0x0000000015AC3F2D (Mono JIT Code) (wrapper runtime-invoke) :runtime_invoke_void__this___object_object (object,intptr,intptr,intptr) 0x00007FFB400A519B (mono) [mini.c:4937] mono_jit_runtime_invoke 0x00007FFB3FFF84FD (mono) [object.c:2623] mono_runtime_invoke 0x00007FFB3FFFE8F7 (mono) [object.c:3827] mono_runtime_invoke_array 0x00007FFB3FFFEBCC (mono) [object.c:5457] mono_message_invoke 0x00007FFB4001EB8B (mono) [threadpool.c:1019] mono_async_invoke 0x00007FFB4001F5E2 (mono) [threadpool.c:1455] async_invoke_thread 0x00007FFB4002329F (mono) [threads.c:685] start_wrapper 0x00007FFB400D78C9 (mono) [win32_threads.c:599] thread_start 0x00007FFB77FC8364 (KERNEL32) BaseThreadInitThunk
I copied full stack trace to make aware any helper where can be the problem. Because, I searched for a solution, like any threaded safe FWS, and yes, there is one, but only for .NET 4, and I need one for .NET 2
This is my code:
using System.IO; //class, namespace, redundant info...
private static FileSystemWatcher m_Watcher;
[InitializeOnLoadMethod]
static void HookWatcher()
{
m_Watcher = new FileSystemWatcher("path", "*.cs");
m_Watcher.NotifyFilter = NotifyFilters.LastWrite;
m_Watcher.IncludeSubdirectories = true;
//m_Watcher.Created += new FileSystemEventHandler(); //Add to the solution before compile
//m_Watcher.Renamed += new FileSystemEventHandler(); //Rename to the solution before compile
//m_Watcher.Deleted += new FileSystemEventHandler(); //Remove to the solution before compile
m_Watcher.Changed += Recompile;
m_Watcher.EnableRaisingEvents = true;
}
private static void Recompile(object sender, FileSystemEventArgs e)
{
Debug.Log("Origin files has been changed!");
}
There nothing special as you can see...
The FSW I saw was this: https://gist.githubusercontent.com/bradsjm/2c839912294d0e2c008a/raw/c4a5c3d920ab46fdaa53b0e111e0d1204b1fe903/FileSystemWatcher.cs
My purpose with this is simple, I have a separated DLL from my current Unity project, the idea is simple, I want to recompile everything automatically from Unity when any change from the project of the DLL is changed, but I can't achieve that because of threads, so what can I do? Is there any alternative that listen files that is compatible with Unity?
Thanks.
I solved it with the help of @Kay, thanks @Kay!
I wanted to make a more generic answer, so I decided to make my own class to achieve what I wanted. And this is the result:
using System;
using System.IO;
using System.Collections.Generic;
namespace Lerp2APIEditor.Utility
{
public class LerpedThread<T>
{
public T value = default(T);
public bool isCalled = false;
public string methodCalled = "";
public Dictionary<string, Action> matchedMethods = new Dictionary<string, Action>();
public FileSystemWatcher FSW
{
get
{
return (FileSystemWatcher)(object)value;
}
}
public LerpedThread(string name, FSWParams pars)
{
if(typeof(T) == typeof(FileSystemWatcher))
{
FileSystemWatcher watcher = new FileSystemWatcher(pars.path, pars.filter);
watcher.NotifyFilter = pars.notifiers;
watcher.IncludeSubdirectories = pars.includeSubfolders;
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Created += new FileSystemEventHandler(OnCreated);
watcher.Deleted += new FileSystemEventHandler(OnDeleted);
watcher.Renamed += new RenamedEventHandler(OnRenamed);
ApplyChanges(watcher);
}
}
private void OnChanged(object source, FileSystemEventArgs e)
{
methodCalled = "OnChanged";
isCalled = true;
}
private void OnCreated(object source, FileSystemEventArgs e)
{
methodCalled = "OnCreated";
isCalled = true;
}
private void OnDeleted(object source, FileSystemEventArgs e)
{
methodCalled = "OnDeleted";
isCalled = true;
}
private void OnRenamed(object source, RenamedEventArgs e)
{
methodCalled = "OnRenamed";
isCalled = true;
}
public void StartFSW()
{
FSW.EnableRaisingEvents = true;
}
public void CancelFSW()
{
FSW.EnableRaisingEvents = false;
}
public void ApplyChanges<T1>(T1 obj)
{
value = (T)(object)obj;
}
}
public class FSWParams
{
public string path,
filter;
public NotifyFilters notifiers;
public bool includeSubfolders;
public FSWParams(string p, string f, NotifyFilters nf, bool isf)
{
path = p;
filter = f;
notifiers = nf;
includeSubfolders = isf;
}
}
}
Main class code:
namespace Lerp2APIEditor
{
public class LerpedEditorCore
{
private static LerpedThread<FileSystemWatcher> m_Watcher;
[InitializeOnLoadMethod]
static void HookWatchers()
{
EditorApplication.update += OnEditorApplicationUpdate;
m_Watcher.matchedMethods.Add("OnChanged", () => {
Debug.Log("Origin files has been changed!");
});
m_Watcher.StartFSW();
}
static void OnEditorApplicationUpdate()
{
if(EditorApplication.timeSinceStartup > nextSeek)
{
if (m_Watcher.isCalled)
{
foreach (KeyValuePair<string, Action> kv in m_Watcher.matchedMethods)
if (m_Watcher.methodCalled == kv.Key)
kv.Value();
m_Watcher.isCalled = false;
}
nextSeek = EditorApplication.timeSinceStartup + threadSeek;
}
}
}
}
The thing I have done is very simple. I only created a generic class that create a FSW instance or whatever you want to listen. One time created, I attach the events that only activates the bool @Kay suggested me to use, and also the method called to know exactly what method have been called.
Later in the main class, a foreach loops every method listed every second if a change has been detected, and the method linked to the string get called.