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// Bridges the Mono and CoreFX FileSystemWatcher types.
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Threading;
using System.Threading.Tasks;
using System.Runtime.CompilerServices;
using C = System.IO.CoreFX.FileSystemWatcher;
using M = System.IO.FileSystemWatcher;
using Handle = System.Object;
namespace System.IO {
internal class CoreFXFileSystemWatcherProxy : IFileWatcher
{
static IFileWatcher instance; // Mono FSW objects -> this
static IDictionary<Handle, C> internal_map; // this -> CoreFX FSW objects
static ConditionalWeakTable<Handle, M> external_map; // this -> Mono FSW objects
static IDictionary<object, Handle> event_map; // CoreFX FSW events -> this
const int INTERRUPT_MS = 300;
protected void Operation (Action<IDictionary<object, C>, ConditionalWeakTable<object, M>, IDictionary<object, object>, Handle> map_op = null, Action<C, M> object_op = null, object handle = null, Action<C, M> cancel_op = null)
{
C internal_fsw = null;
M fsw = null;
bool live, havelock;
if (cancel_op != null) { // highest priority and must not lock
havelock = Monitor.TryEnter (instance, INTERRUPT_MS);
live = (handle != null && (internal_map.TryGetValue (handle, out internal_fsw) || external_map.TryGetValue (handle, out fsw))) ;
if (live && havelock)
try { cancel_op (internal_fsw, fsw); }
catch (Exception) { };
if (havelock)
Monitor.Exit (instance);
if (live && !havelock)
try {
var t = Task<bool>.Run( () => { cancel_op (internal_fsw, fsw); return true;});
t.Wait (INTERRUPT_MS);
}
catch (Exception) { };
return;
}
if (map_op != null && handle == null) {
lock (instance) {
try { map_op (internal_map, external_map, event_map, null); }
catch (Exception e) { throw new InvalidOperationException (nameof(map_op), e); }
}
return;
}
if (handle == null)
return;
lock (instance) {
live = (internal_map.TryGetValue (handle, out internal_fsw) && external_map.TryGetValue (handle, out fsw)) ;
if (live && map_op != null) {
try { map_op (internal_map, external_map, event_map, handle); }
catch (Exception e) { throw new InvalidOperationException (nameof(map_op), e); };
}
}
if (!live || object_op == null)
return;
try { object_op (internal_fsw, fsw); }
catch (Exception e) { throw new InvalidOperationException (nameof(object_op), e); };
}
protected void ProxyDispatch (object sender, FileAction action, FileSystemEventArgs args)
{
RenamedEventArgs renamed =
action == FileAction.RenamedNewName ? (RenamedEventArgs) args : null;
object handle = null;
Operation (map_op: (in_map, out_map, event_map, h) => event_map.TryGetValue (sender, out handle));
Operation (object_op: (_, fsw) => {
if (!fsw.EnableRaisingEvents)
return;
fsw.DispatchEvents (action, args.Name, ref renamed);
if (fsw.Waiting) {
fsw.Waiting = false;
System.Threading.Monitor.PulseAll (fsw);
}
}, handle: handle);
}
protected void ProxyDispatchError (object sender, ErrorEventArgs args)
{
object handle = null;
Operation (map_op: (in_map, out_map, event_map, _) => event_map.TryGetValue (sender, out handle));
Operation (object_op: (_, fsw) => fsw.DispatchErrorEvents (args),
handle: handle);
}
public object NewWatcher (M fsw)
{
var handle = new object ();
var result = new C ();
result.Changed += (object o, FileSystemEventArgs args) =>
{ ProxyDispatch (o, FileAction.Modified, args); };
result.Created += (object o, FileSystemEventArgs args) =>
{ ProxyDispatch (o, FileAction.Added, args); };
result.Deleted += (object o, FileSystemEventArgs args) =>
{ ProxyDispatch (o, FileAction.Removed, args); };
result.Renamed += (object o, RenamedEventArgs args) =>
{ ProxyDispatch (o, FileAction.RenamedNewName, args); };
result.Error += (object o, ErrorEventArgs args) =>
{ ProxyDispatchError (handle, args); };
Operation (map_op: (in_map, out_map, event_map, _) => {
in_map.Add (handle, result);
out_map.Add (handle, fsw);
event_map.Add (result, handle);
});
return handle;
}
public void StartDispatching (object handle)
{
Operation (object_op: (internal_fsw, fsw) => {
internal_fsw.Path = fsw.Path;
internal_fsw.Filter = fsw.Filter;
internal_fsw.IncludeSubdirectories = fsw.IncludeSubdirectories;
internal_fsw.InternalBufferSize = fsw.InternalBufferSize;
internal_fsw.NotifyFilter = fsw.NotifyFilter;
internal_fsw.Site = fsw.Site;
internal_fsw.EnableRaisingEvents = true;
}, handle: handle);
}
public void StopDispatching (object handle)
{
Operation (handle: handle,
cancel_op: (internal_fsw, fsw) =>
{
if (internal_fsw != null)
internal_fsw.EnableRaisingEvents = false;
});
}
public void Dispose (object handle)
{
if (handle == null)
return;
Operation (handle: handle,
cancel_op: (internal_fsw, fsw) => {
if (internal_fsw != null)
internal_fsw.Dispose ();
var inner_key = internal_map [handle];
internal_map.Remove (handle);
external_map.Remove (handle);
event_map.Remove (inner_key);
handle = null;
});
}
public static bool GetInstance (out IFileWatcher watcher)
{
if (instance != null) {
watcher = instance;
return true;
}
internal_map = new ConcurrentDictionary <object, C> ();
external_map = new ConditionalWeakTable <object, M> ();
event_map = new ConcurrentDictionary <object, object> ();
instance = watcher = new CoreFXFileSystemWatcherProxy ();
return true;
}
}
}
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