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using Implab.Parallels;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace Implab.Diagnostics.Interactive
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{
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public class InteractiveListener: ListenerBase
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{
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TraceForm m_form;
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SynchronizationContext m_syncGuiThread;
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readonly Promise m_guiStarted = new Promise();
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readonly IPromise m_guiFinished;
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readonly SimpleAsyncQueue<TraceViewItem> m_queue = new SimpleAsyncQueue<TraceViewItem>();
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readonly AutoResetEvent m_queueEvent = new AutoResetEvent(false);
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int m_queueLength;
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bool m_exitPending;
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readonly object m_pauseLock = new object();
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bool m_paused;
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readonly ManualResetEvent m_pauseEvent = new ManualResetEvent(true);
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public InteractiveListener() {
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m_guiFinished = RunGuiThread();
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AsyncPool.RunThread(QueueThread);
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m_guiStarted.Join();
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}
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void GuiThread() {
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m_form = new TraceForm(); // will create SynchronizationContext
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m_form.PauseEvents += (s,a) => Pause();
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m_form.ResumeEvents += (s, a) => Resume();
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m_syncGuiThread = SynchronizationContext.Current;
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m_guiStarted.Resolve();
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Application.Run();
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}
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void QueueThread() {
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while (!m_exitPending) {
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if (m_paused)
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m_pauseEvent.WaitOne();
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TraceViewItem item;
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if (m_queue.TryDequeue(out item)) {
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Interlocked.Decrement(ref m_queueLength);
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m_syncGuiThread.Post(x => m_form.AddTraceEvent(item),null);
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} else {
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m_queueEvent.WaitOne();
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}
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}
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}
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public IPromise RunGuiThread() {
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var p = new Promise();
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var caller = TraceContext.Instance.CurrentOperation;
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var worker = new Thread(() => {
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TraceContext.Instance.EnterLogicalOperation(caller, false);
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try {
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Application.OleRequired();
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GuiThread();
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p.Resolve();
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} catch (Exception e) {
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p.Reject(e);
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} finally {
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TraceContext.Instance.Leave();
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}
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});
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worker.SetApartmentState(ApartmentState.STA);
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worker.IsBackground = true;
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worker.Name = string.Format("{0} GUI Thread", nameof(InteractiveListener));
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worker.Start();
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return p;
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}
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public void Pause() {
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// for consistency we need to set this properties atomically
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lock (m_pauseLock) {
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m_pauseEvent.Reset();
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m_paused = true;
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}
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}
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public void Resume() {
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// for consistency we need to set this properties atomically
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lock (m_pauseLock) {
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m_paused = false;
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m_pauseEvent.Set();
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}
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}
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void Enqueue(TraceViewItem item) {
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m_queue.Enqueue(item);
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if (Interlocked.Increment(ref m_queueLength) == 1)
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m_queueEvent.Set();
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}
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public void ShowForm() {
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m_syncGuiThread.Post(x => m_form.Show(), null);
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}
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public void HideForm() {
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m_syncGuiThread.Post(x => m_form.Hide(), null);
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}
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void Terminate() {
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m_exitPending = true;
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Resume();
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m_syncGuiThread.Post(x => Application.ExitThread(), null);
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}
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protected override void Dispose(bool disposing) {
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if (disposing) {
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Terminate();
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m_guiFinished.Join();
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}
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base.Dispose(disposing);
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}
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public override void Write(LogEventArgs args, object entry) {
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var item = new TraceViewItem {
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Indent = args.Operation.Level,
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Message = entry.ToString(),
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Thread = args.ThreadId,
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Channel = args.Channel.ToString(),
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Timestamp = Environment.TickCount,
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TimeDelta = args.OperationTimeOffset
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};
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Enqueue(item);
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}
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}
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}
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