--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Implab/Diagnostics/TraceContext.cs	Tue Apr 15 02:00:09 2014 +0400
@@ -0,0 +1,97 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Implab.Diagnostics {
+    public class TraceContext {
+        LogicalOperation m_currentOperation;
+        readonly LogicalOperation m_traceBound;
+        readonly int m_threadId;
+        readonly TraceContext m_parent;
+
+        readonly static object _consoleLock = new object();
+
+        [ThreadStatic]
+        static TraceContext _current;
+
+        public static TraceContext Current {
+            get {
+                if (_current == null)
+                    _current = new TraceContext();
+                return _current;
+            }
+        }
+
+        TraceContext(TraceContext context) {
+            if (context == null)
+                throw new ArgumentNullException("context");
+
+            m_parent = context;
+            m_currentOperation = context.CurrentOperation;
+            m_traceBound = context.CurrentOperation;
+            m_threadId = Thread.CurrentThread.ManagedThreadId;
+
+            LogEvent(TraceEventType.Transfer, String.Empty);
+        }
+
+        TraceContext() {
+            m_currentOperation = new LogicalOperation();
+            m_traceBound = m_currentOperation;
+            m_threadId = Thread.CurrentThread.ManagedThreadId;
+        }
+
+        public static void Transfer(TraceContext from) {
+            _current = from == null ? new TraceContext() : new TraceContext(from);
+        }
+
+        public TraceContext ParentContext {
+            get {
+                return m_parent;
+            }
+        }
+
+        public LogicalOperation CurrentOperation {
+            get {
+                return m_currentOperation;
+            }
+        }
+
+        public LogicalOperation TraceBound {
+            get {
+                return m_traceBound;
+            }
+        }
+
+        public int ThreadId {
+            get {
+                return m_threadId;
+            }
+        }
+
+        public void StartLogicalOperation() {
+            StartLogicalOperation(null);
+        }
+
+        public void StartLogicalOperation(string name) {
+            LogEvent(TraceEventType.OperationStarted, "{0}", name);
+            m_currentOperation = new LogicalOperation(name, m_currentOperation);
+        }
+
+        public void EndLogicalOperation() {
+            if (m_traceBound == m_currentOperation) {
+                LogEvent(TraceEventType.Error, "Trying to end the operation which isn't belongs to current trace");
+            } else {
+                var op = m_currentOperation;
+                m_currentOperation = m_currentOperation.Parent;
+                LogEvent(TraceEventType.OperationCompleted, "{0} {1} ms", op.Name, op.Duration);
+            }
+        }
+
+        void LogEvent(TraceEventType type, string format, params object[] args) {
+            LogChannel<TraceEvent>.Default.LogEvent(TraceEvent.Create(type, format, args));
+        }
+    }
+}