/// <summary>Creates an instance of T using m_valueFactory in case its not null or use reflection to create a new T()</summary>
/// <returns>An instance of Boxed.</returns>
private Boxed CreateValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (m_valueFactory != null)
{
try
{
// check for recursion
if (m_valueFactory == PUBLICATION_ONLY_OR_ALREADY_INITIALIZED)
{
throw new InvalidOperationException("Lazy_Value_RecursiveCallsToValue");
}
Func <T> factory = m_valueFactory;
m_valueFactory = PUBLICATION_ONLY_OR_ALREADY_INITIALIZED;
boxed = new Boxed(factory());
}
catch (Exception ex)
{
m_boxed = new LazyInternalExceptionHolder(ex);
throw;
}
}
else
{
boxed = new Boxed((T)Activator.CreateInstance(typeof(T)));
}
return(boxed);
}
private T LazyInitValue()
{
Boxed boxed = null;
if (_lock == null)
{
boxed = new Boxed(_value());
}
else
{
lock (_lock)
{
if (_boxed == null)
{
_boxed = boxed = new Boxed(_value());
}
}
//bool locked = false;
//try
//{
// Monitor.Enter(_lock, ref locked);
// if(_boxed == null)
// _boxed = boxed = new Boxed(_value());
//}
//finally
//{
// if(locked)
// Monitor.Exit(_lock);
//}
}
return(boxed.value);
}
/// <summary>Creates an instance of T using m_valueFactory in case its not null or use reflection to create a new T()</summary>
/// <returns>An instance of Boxed.</returns>
private Boxed CreateValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (_valueFactory != null)
{
try
{
// check for recursion
if (mode != LazyThreadSafetyMode.PublicationOnly && _valueFactory == s_ALREADY_INVOKED_SENTINEL)
{
throw new InvalidOperationException(SR.Lazy_Value_RecursiveCallsToValue);
}
Func <T> factory = _valueFactory;
if (mode != LazyThreadSafetyMode.PublicationOnly) // only detect recursion on None and ExecutionAndPublication modes
{
_valueFactory = s_ALREADY_INVOKED_SENTINEL;
}
else if (factory == s_ALREADY_INVOKED_SENTINEL)
{
// Another thread raced with us and beat us to successfully invoke the factory.
return(null);
}
boxed = new Boxed(factory());
}
catch (Exception ex)
{
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
_boxed = new LazyInternalExceptionHolder(ex);
}
throw;
}
}
else
{
try
{
boxed = new Boxed(Activator.CreateInstance <T>());
}
catch (MissingMethodException)
{
Exception ex = new MissingMethodException(SR.Lazy_CreateValue_NoParameterlessCtorForT);
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
_boxed = new LazyInternalExceptionHolder(ex);
}
throw ex;
}
}
return(boxed);
}
/// <summary>Creates an instance of T using m_valueFactory in case its not null or use reflection to create a new T()</summary>
/// <returns>An instance of Boxed.</returns>
private Boxed CreateValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (m_valueFactory != null)
{
try
{
// check for recursion
if (mode != LazyThreadSafetyMode.PublicationOnly && m_valueFactory == ALREADY_INVOKED_SENTINEL)
{
throw new InvalidOperationException("Should not try to create the value more than once");
}
Func2 <T> factory = m_valueFactory;
if (mode != LazyThreadSafetyMode.PublicationOnly) // only detect recursion on None and ExecutionAndPublication modes
{
m_valueFactory = ALREADY_INVOKED_SENTINEL;
}
else if (factory == ALREADY_INVOKED_SENTINEL)
{
// Another thread raced to successfully invoke the factory.
return(null);
}
boxed = new Boxed(factory());
}
catch (Exception ex)
{
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
m_boxed = new LazyInternalExceptionHolder(ex);
}
throw;
}
}
else
{
try
{
boxed = new Boxed((T)Activator.CreateInstance(typeof(T)));
}
catch (MissingMethodException)
{
Exception ex = new MissingMemberException(string.Format("The type {0} does not have parameterless constructor", typeof(T).FullName));
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
m_boxed = new LazyInternalExceptionHolder(ex);
}
throw ex;
}
}
return(boxed);
}
/// <summary>Creates an instance of T using m_valueFactory in case its not null or use reflection to create a new T()</summary>
/// <returns>An instance of Boxed.</returns>
private Boxed CreateValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (m_valueFactory != null)
{
try
{
// check for recursion
if (mode != LazyThreadSafetyMode.PublicationOnly && m_valueFactory == ALREADY_INVOKED_SENTINEL)
{
throw new InvalidOperationException(Environment.GetResourceString("Lazy_Value_RecursiveCallsToValue"));
}
Func <T> factory = m_valueFactory;
if (mode != LazyThreadSafetyMode.PublicationOnly) // only detect recursion on None and ExecutionAndPublication modes
{
m_valueFactory = ALREADY_INVOKED_SENTINEL;
}
else if (factory == ALREADY_INVOKED_SENTINEL)
{
// Another thread ----d with us and beat us to successfully invoke the factory.
return(null);
}
boxed = new Boxed(factory());
}
catch (Exception ex)
{
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
m_boxed = new LazyInternalExceptionHolder(ex);
}
throw;
}
}
else
{
try
{
boxed = new Boxed((T)Activator.CreateInstance(typeof(T)));
}
catch (System.MissingMethodException)
{
Exception ex = new System.MissingMemberException(Environment.GetResourceString("Lazy_CreateValue_NoParameterlessCtorForT"));
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
m_boxed = new LazyInternalExceptionHolder(ex);
}
throw ex;
}
}
return(boxed);
}
/// <summary>Creates an instance of T using m_valueFactory in case its not null or use reflection to create a new T()</summary>
/// <returns>An instance of Boxed.</returns>
private Boxed CreateValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (m_valueFactory != null)
{
try
{
// check for recursion
if (mode != LazyThreadSafetyMode.PublicationOnly && m_valueFactory == PUBLICATION_ONLY_OR_ALREADY_INITIALIZED)
{
throw new InvalidOperationException(Environment2.GetResourceString("Lazy_Value_RecursiveCallsToValue"));
}
Func <T> factory = m_valueFactory;
if (mode != LazyThreadSafetyMode.PublicationOnly) // only detect recursion on None and ExecutionAndPublication modes
{
m_valueFactory = PUBLICATION_ONLY_OR_ALREADY_INITIALIZED;
}
boxed = new Boxed(factory());
}
catch (Exception ex)
{
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
#if PFX_LEGACY_3_5
m_boxed = new LazyInternalExceptionHolder(ex);
#else
m_boxed = new LazyInternalExceptionHolder(ex.PrepForRemoting());// copy the call stack by calling the internal method PrepForRemoting
#endif
}
throw;
}
}
else
{
try
{
boxed = new Boxed((T)Activator.CreateInstance(typeof(T)));
}
catch (System.MissingMethodException)
{
Exception ex = new System.MissingMemberException(Environment2.GetResourceString("Lazy_CreateValue_NoParameterlessCtorForT"));
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
m_boxed = new LazyInternalExceptionHolder(ex);
}
throw ex;
}
}
return(boxed);
}
private Boxed CreateValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (m_valueFactory != null)
{
try
{
// check for recursion
if (mode != LazyThreadSafetyMode.PublicationOnly && m_valueFactory == PUBLICATION_ONLY_OR_ALREADY_INITIALIZED)
{
throw new InvalidOperationException();
}
Func <T> factory = m_valueFactory;
if (mode != LazyThreadSafetyMode.PublicationOnly) // only detect recursion on None and ExecutionAndPublication modes
{
m_valueFactory = PUBLICATION_ONLY_OR_ALREADY_INITIALIZED;
}
boxed = new Boxed(factory());
}
catch (Exception ex)
{
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
m_boxed = new LazyInternalExceptionHolder(ex);
}
throw;
}
}
else
{
try
{
boxed = new Boxed((T)Activator.CreateInstance(typeof(T)));
}
catch (System.MissingMethodException)
{
Exception ex = new System.MissingMemberException("No parameterless constructor found for " + typeof(T).FullName);
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
m_boxed = new LazyInternalExceptionHolder(ex);
}
throw ex;
}
}
return(boxed);
}
private Boxed CreateValue()
{
Boxed boxed;
LazyThreadSafetyMode mode = Mode;
if (m_ValueFactory != null)
{
try
{
if ((mode != LazyThreadSafetyMode.PublicationOnly) &&
(m_ValueFactory == s_PublicationOnlyOrAlreadyInitialized))
{
throw new InvalidOperationException("Lazy_Value_RecursiveCallsToValue");
}
Func <T> valueFactory = m_ValueFactory;
if (mode != LazyThreadSafetyMode.PublicationOnly)
{
m_ValueFactory = s_PublicationOnlyOrAlreadyInitialized;
}
return(new Boxed(valueFactory()));
}
catch (Exception exception)
{
if (mode != LazyThreadSafetyMode.PublicationOnly)
{
m_Boxed = new LazyInternalExceptionHolder(exception);
}
throw;
}
}
try
{
boxed = new Boxed((T)Activator.CreateInstance(typeof(T)));
}
catch (MissingMethodException)
{
Exception ex = new MissingMemberException("Lazy_CreateValue_NoParameterlessCtorForT");
if (mode != LazyThreadSafetyMode.PublicationOnly)
{
m_Boxed = new LazyInternalExceptionHolder(ex);
}
throw ex;
}
return(boxed);
}
/// <summary>Creates an instance of T using m_valueFactory in case its not null or use reflection to create a new T()</summary>
/// <returns>An instance of Boxed.</returns>
private Boxed CreateValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (m_valueFactory != null)
{
try {
// check for recursion
if (mode != LazyThreadSafetyMode.PublicationOnly && m_valueFactory == PUBLICATION_ONLY_OR_ALREADY_INITIALIZED)
{
throw new InvalidOperationException("ValueFactory attempted to access the Value property of this instance.");
}
Func <T> factory = m_valueFactory;
if (mode != LazyThreadSafetyMode.PublicationOnly) // only detect recursion on None and ExecutionAndPublication modes
{
m_valueFactory = PUBLICATION_ONLY_OR_ALREADY_INITIALIZED;
}
boxed = new Boxed(factory());
} catch (Exception ex) {
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
#if PFX_LEGACY_3_5
m_boxed = new LazyInternalExceptionHolder(ex);
#else
m_boxed = new LazyInternalExceptionHolder(ex.PrepForRemoting());// copy the call stack by calling the internal method PrepForRemoting
#endif
}
throw;
}
}
else
{
try {
boxed = new Boxed((T)Activator.CreateInstance(typeof(T)));
} catch (System.MissingMethodException) {
Exception ex = new System.MissingMemberException("The lazily-initialized type does not have a public, parameterless constructor.");
if (mode != LazyThreadSafetyMode.PublicationOnly) // don't cache the exception for PublicationOnly mode
{
m_boxed = new LazyInternalExceptionHolder(ex);
}
throw ex;
}
}
return(boxed);
}
/// <summary>Creates an instance of T using m_valueFactory in case its not null or use reflection to create a new T()</summary>
/// <returns>An instance of Boxed.</returns>
private Boxed CreateValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (m_valueFactory != null)
{
try
{
// check for recursion
if (mode != LazyThreadSafetyMode.PublicationOnly && m_valueFactory == ALREADY_INVOKED_SENTINEL)
{
throw new InvalidOperationException();
}
Func <T> factory = m_valueFactory;
if (mode != LazyThreadSafetyMode.PublicationOnly) // only detect recursion on None and ExecutionAndPublication modes
{
m_valueFactory = ALREADY_INVOKED_SENTINEL;
}
else if (factory == ALREADY_INVOKED_SENTINEL)
{
// Another thread ----d with us and beat us to successfully invoke the factory.
return(null);
}
boxed = new Boxed(factory());
}
catch (Exception ex)
{
throw;
}
}
else
{
try
{
boxed = new Boxed((T)Activator.CreateInstance(typeof(T)));
}
catch (System.MissingMethodException)
{
Exception ex = new System.MissingMemberException();
throw ex;
}
}
return(boxed);
}
private Boxed <T> CreateValue()
{
Boxed <T> boxed = null;
LazyThreadSafetyMode mode = this.Mode;
if (this.m_valueFactory != null)
{
try
{
if ((mode != LazyThreadSafetyMode.PublicationOnly) && (this.m_valueFactory == Lazy <T> .PUBLICATION_ONLY_OR_ALREADY_INITIALIZED))
{
throw new InvalidOperationException(Environment.GetResourceString("Lazy_Value_RecursiveCallsToValue"));
}
Func <T> valueFactory = this.m_valueFactory;
if (mode != LazyThreadSafetyMode.PublicationOnly)
{
this.m_valueFactory = Lazy <T> .PUBLICATION_ONLY_OR_ALREADY_INITIALIZED;
}
return(new Boxed <T>(valueFactory()));
}
catch (Exception exception)
{
if (mode != LazyThreadSafetyMode.PublicationOnly)
{
this.m_boxed = new LazyInternalExceptionHolder <T>(exception.PrepForRemoting());
}
throw;
}
}
try
{
boxed = new Boxed <T>((T)Activator.CreateInstance(typeof(T)));
}
catch (MissingMethodException)
{
Exception ex = new MissingMemberException(Environment.GetResourceString("Lazy_CreateValue_NoParameterlessCtorForT"));
if (mode != LazyThreadSafetyMode.PublicationOnly)
{
this.m_boxed = new LazyInternalExceptionHolder <T>(ex);
}
throw ex;
}
return(boxed);
}
private T LazyInitValue()
{
Boxed boxed = null;
switch (Mode)
{
case LazyThreadSafetyMode.None:
boxed = CreateValue();
_boxed = boxed;
break;
case LazyThreadSafetyMode.PublicationOnly:
boxed = CreateValue();
#pragma warning disable 420
if (Interlocked.CompareExchange(ref _boxed, boxed, null) != null)
{
boxed = (Boxed)_boxed;
}
#pragma warning restore 420
break;
default:
lock (_threadSafeObj)
{
if (_boxed == null)
{
boxed = CreateValue();
_boxed = boxed;
}
else
{
boxed = (_boxed as Boxed);
if (boxed == null)
{
var holder = (_boxed as LazyInternalExceptionHolder);
throw holder._exception;
}
}
}
break;
}
return(boxed._value);
}
/// <summary>
/// local helper method to initialize the value
/// </summary>
/// <returns>The inititialized T value</returns>
private T LazyInitValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (mode == LazyThreadSafetyMode.None)
{
boxed = CreateValue();
m_boxed = boxed;
}
else if (mode == LazyThreadSafetyMode.PublicationOnly)
{
boxed = CreateValue();
if (Interlocked.CompareExchange(ref m_boxed, boxed, null) != null)
{
boxed = (Boxed)m_boxed; // set the boxed value to the succeeded thread value
}
}
else
{
lock (m_threadSafeObj)
{
if (m_boxed == null)
{
boxed = CreateValue();
m_boxed = boxed;
}
else // got the lock but the value is not null anymore, check if it is created by another thread or faulted and throw if so
{
boxed = m_boxed as Boxed;
if (boxed == null) // it is not Boxed, so it is a LazyInternalExceptionHolder
{
LazyInternalExceptionHolder exHolder = m_boxed as LazyInternalExceptionHolder;
Contract.Assert(exHolder != null);
throw exHolder.m_exception;
}
}
}
}
Contract.Assert(boxed != null);
return(boxed.m_value);
}
private T LazyInitValue()
{
Boxed <T> boxed = null;
switch (this.Mode)
{
case LazyThreadSafetyMode.None:
boxed = this.CreateValue();
this.m_boxed = boxed;
break;
case LazyThreadSafetyMode.PublicationOnly:
boxed = this.CreateValue();
if (Interlocked.CompareExchange(ref this.m_boxed, boxed, null) != null)
{
boxed = (Boxed <T>) this.m_boxed;
}
break;
default:
lock (this.m_threadSafeObj)
{
if (this.m_boxed == null)
{
boxed = this.CreateValue();
this.m_boxed = boxed;
}
else
{
boxed = this.m_boxed as Boxed <T>;
if (boxed == null)
{
LazyInternalExceptionHolder <T> holder = this.m_boxed as LazyInternalExceptionHolder <T>;
throw holder.m_exception;
}
}
}
break;
}
return(boxed.m_value);
}
private T LazyInitValue()
{
Boxed boxed = null;
object threadSafeObj = m_threadSafeObj;
bool lockTaken = false;
try
{
if (threadSafeObj != (object)ALREADY_INVOKED_SENTINEL)
{
Monitor.Enter(threadSafeObj);
lockTaken = true;
}
if (m_boxed == null)
{
boxed = CreateValue();
m_boxed = boxed;
m_threadSafeObj = ALREADY_INVOKED_SENTINEL;
}
else
{
boxed = m_boxed as Boxed;
if (boxed == null)
{
var exc = m_boxed as Exception;
exc.Throw();
}
}
}
finally
{
if (lockTaken)
{
Monitor.Exit(threadSafeObj);
}
}
return(boxed.m_value);
}
/// <summary>
/// local helper method to initialize the value
/// </summary>
/// <returns>The inititialized T value</returns>
private T LazyInitValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (m_boxed == null)
{
boxed = CreateValue();
m_boxed = boxed;
}
else // got the lock but the value is not null anymore, check if it is created by another thread or faulted and throw if so
{
boxed = m_boxed as Boxed;
if (boxed == null) // it is not Boxed, so it is a LazyInternalExceptionHolder
{
LazyInternalExceptionHolder exHolder = m_boxed as LazyInternalExceptionHolder;
System.Diagnostics.Debug.Assert(exHolder != null);
throw exHolder.m_exception;
}
}
System.Diagnostics.Debug.Assert(boxed != null);
return(boxed.m_value);
}
private Boxed CreateValue()
{
Boxed boxed = null;
try
{
if (m_valueFactory == ALREADY_INVOKED_SENTINEL)
{
throw new InvalidOperationException();
}
Func <T> factory = m_valueFactory;
m_valueFactory = ALREADY_INVOKED_SENTINEL;
boxed = new Boxed(factory());
}
catch (Exception ex)
{
m_boxed = ex;
throw;
}
return(boxed);
}
/// <summary>
/// local helper method to initialize the value
/// </summary>
/// <returns>The inititialized T value</returns>
private T LazyInitValue()
{
Boxed boxed = null;
LazyThreadSafetyMode mode = Mode;
if (mode == LazyThreadSafetyMode.None)
{
boxed = CreateValue();
m_boxed = boxed;
}
else if (mode == LazyThreadSafetyMode.PublicationOnly)
{
boxed = CreateValue();
if (boxed == null ||
Interlocked.CompareExchange(ref m_boxed, boxed, null) != null)
{
// If CreateValue returns null, it means another thread successfully invoked the value factory
// and stored the result, so we should just take what was stored. If CreateValue returns non-null
// but we lose the ---- to store the single value, again we should just take what was stored.
boxed = (Boxed)m_boxed;
}
else
{
// We successfully created and stored the value. At this point, the value factory delegate is
// no longer needed, and we don't want to hold onto its resources.
m_valueFactory = ALREADY_INVOKED_SENTINEL;
}
}
else
{
object threadSafeObj = Volatile.Read(ref m_threadSafeObj);
bool lockTaken = false;
try
{
if (threadSafeObj != (object)ALREADY_INVOKED_SENTINEL)
{
Monitor.Enter(threadSafeObj, ref lockTaken);
}
else
{
Contract.Assert(m_boxed != null);
}
if (m_boxed == null)
{
boxed = CreateValue();
m_boxed = boxed;
Volatile.Write(ref m_threadSafeObj, ALREADY_INVOKED_SENTINEL);
}
else // got the lock but the value is not null anymore, check if it is created by another thread or faulted and throw if so
{
boxed = m_boxed as Boxed;
if (boxed == null) // it is not Boxed, so it is a LazyInternalExceptionHolder
{
LazyInternalExceptionHolder exHolder = m_boxed as LazyInternalExceptionHolder;
Contract.Assert(exHolder != null);
exHolder.m_edi.Throw();
}
}
}
finally
{
if (lockTaken)
{
Monitor.Exit(threadSafeObj);
}
}
}
Contract.Assert(boxed != null);
return(boxed.m_value);
}
