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using System;
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using System.Collections.Generic;
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using System.Threading;
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namespace Implab.Diagnostics {
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/// <summary>
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/// Trace context is bound to the specific thread, each thread has it's own ThreadContext.
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/// </summary>
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/// <remarks>
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/// ThreadContext manages relations between logical operations and threads.
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/// </remarks>
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public class TraceContext {
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[ThreadStatic]
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static TraceContext _instance;
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OperationContext m_current = OperationContext.EMPTY;
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readonly Stack<OperationContext> m_stack = new Stack<OperationContext>();
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readonly int m_threadId;
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public static TraceContext Instance {
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get {
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if (_instance == null)
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_instance = new TraceContext();
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return _instance;
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}
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}
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public TraceContext() {
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m_threadId = Thread.CurrentThread.ManagedThreadId;
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}
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public int ThreadId {
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get { return m_threadId; }
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}
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public LogicalOperation CurrentOperation {
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get {
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return m_current.CurrentOperation;
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}
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}
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public void EnterLogicalOperation(LogicalOperation operation, bool takeOwnership) {
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//var prev = CurrentOperation;
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//LogChannel<TraceEvent>.Default.LogEvent(new TraceEvent(takeOwnership ? TraceEventType.Attach : TraceEventType.Enter, String.Format("{0} -> {1}",prev.Name, operation.Name)));
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m_stack.Push(m_current);
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m_current = new OperationContext(operation, takeOwnership);
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}
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public void StartLogicalOperation(string name) {
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LogChannel<TraceEvent>.Default.LogEvent(new TraceEvent(TraceEventType.OperationStarted, name));
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m_current.BeginLogicalOperation(name);
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}
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public void StartLogicalOperation() {
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StartLogicalOperation(String.Empty);
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}
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public LogicalOperation EndLogicalOperation() {
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return m_current.EndLogicalOperation();
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}
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public LogicalOperation DetachLogicalOperation() {
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var prev = m_current.DetachLogicalOperation();
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//LogChannel<TraceEvent>.Default.LogEvent(new TraceEvent(TraceEventType.Detach, String.Format("{0} -> {1}",prev.Name, CurrentOperation.Name)));
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return prev;
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}
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public void Leave() {
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if (m_stack.Count > 0) {
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m_current.Leave();
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//var prev = CurrentOperation;
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m_current = m_stack.Pop();
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//LogChannel<TraceEvent>.Default.LogEvent(new TraceEvent(TraceEventType.Leave, String.Format("{0} -> {1}", prev.Name, CurrentOperation.Name)));
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} else {
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TraceLog.TraceWarning("Attempt to leave the last operation context");
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m_current = OperationContext.EMPTY;
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}
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}
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}
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}
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