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// AsyncEvaluationTracker.cs
//
// Author:
// Lluis Sanchez Gual <lluis@novell.com>
//
// Copyright (c) 2008 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//
using System;
using System.Collections.Generic;
using Mono.Debugging.Client;
using Mono.Debugging.Backend;
namespace Mono.Debugging.Evaluation
{
public delegate ObjectValue ObjectEvaluatorDelegate ();
/// <summary>
/// This class can be used to generate an ObjectValue using a provided evaluation delegate.
/// The value is initialy evaluated synchronously (blocking the caller). If no result
/// is obtained after a short period (provided in the WaitTime property), evaluation
/// will then be made asynchronous and the Run method will immediately return an ObjectValue
/// with the Evaluating state.
/// </summary>
public class AsyncEvaluationTracker: RemoteFrameObject, IObjectValueUpdater, IDisposable
{
Dictionary<string, UpdateCallback> asyncCallbacks = new Dictionary<string, UpdateCallback> ();
Dictionary<string, ObjectValue> asyncResults = new Dictionary<string, ObjectValue> ();
int asyncCounter = 0;
int cancelTimestamp = 0;
TimedEvaluator runner = new TimedEvaluator ();
public int WaitTime {
get { return runner.RunTimeout; }
set { runner.RunTimeout = value; }
}
public bool IsEvaluating {
get { return runner.IsEvaluating; }
}
public ObjectValue Run (string name, ObjectValueFlags flags, ObjectEvaluatorDelegate evaluator)
{
string id;
int tid;
lock (asyncCallbacks) {
tid = asyncCounter++;
id = tid.ToString ();
}
ObjectValue val = null;
bool done = runner.Run (delegate {
if (tid >= cancelTimestamp)
val = evaluator ();
},
delegate {
if (tid >= cancelTimestamp)
OnEvaluationDone (id, val);
});
if (done)
return val ?? ObjectValue.CreateUnknown (name);
// 'val' may be null if the timed evaluator is disposed while evaluating
else
return ObjectValue.CreateEvaluating (this, new ObjectPath (id, name), flags);
}
public void Dispose ()
{
runner.Dispose ();
}
public void Stop ()
{
lock (asyncCallbacks) {
cancelTimestamp = asyncCounter;
runner.CancelAll ();
foreach (var cb in asyncCallbacks.Values) {
try {
cb.UpdateValue (ObjectValue.CreateFatalError ("", "Canceled", ObjectValueFlags.None));
} catch {
}
}
asyncCallbacks.Clear ();
asyncResults.Clear ();
}
}
public void WaitForStopped ()
{
runner.WaitForStopped ();
}
void OnEvaluationDone (string id, ObjectValue val)
{
if (val == null)
val = ObjectValue.CreateUnknown (null);
UpdateCallback cb = null;
lock (asyncCallbacks) {
if (asyncCallbacks.TryGetValue (id, out cb)) {
try {
cb.UpdateValue (val);
} catch {}
asyncCallbacks.Remove (id);
}
else
asyncResults [id] = val;
}
}
void IObjectValueUpdater.RegisterUpdateCallbacks (UpdateCallback[] callbacks)
{
foreach (UpdateCallback c in callbacks) {
lock (asyncCallbacks) {
ObjectValue val;
string id = c.Path[0];
if (asyncResults.TryGetValue (id, out val)) {
c.UpdateValue (val);
asyncResults.Remove (id);
} else {
asyncCallbacks [id] = c;
}
}
}
}
}
}
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