/// <summary>
/// Select an applicable function without executing it
/// </summary>
/// <param name="context">gate context</param>
/// <param name="mode">mode to run the gated code in</param>
/// <param name="functions">array of gated functions</param>
/// <param name="keepContext">controls whether async operation should keep the synchronization context</param>
/// <remarks>
/// keep context should be set to true in code which is async end to end,
/// and false in other cases to avoid deadlocking
/// </remarks>
/// <returns>a function to perform, never null</returns>
public static Func <T, Task <T> > SelectFunction <T>(this IGateContext context, GatedCode.Modes mode, GatedAsyncFunc <T, T>[] functions, bool keepContext)
{
Tuple <GatedAsyncFunc <T, T>, IGate[]> action = SelectCode(context, null, functions);
if (action != null && action.Item1 != null)
{
return(async t =>
{
context.EnterScopes(mode, action.Item2);
try
{
if (action.Item1.Func != null)
{
return await action.Item1.Func(t).ConfigureAwait(keepContext);
}
}
finally
{
context.ExitScopes(mode, action.Item2);
}
return t;
});
}
return(Task.FromResult);
}
/// <summary>
/// Select an applicable function without executing it
/// </summary>
/// <typeparam name="T">Generic type</typeparam>
/// <param name="context">gate context</param>
/// <param name="mode">mode to run the gated code in</param>
/// <param name="conditionalPredicate">The conditional predicate.</param>
/// <param name="functions">array of gated functions</param>
/// <param name="keepContext">controls whether async operation should keep the synchronization context</param>
/// <remarks>
/// keep context should be set to true in code which is async end to end,
/// and false in other cases to avoid deadlocking
/// </remarks>
/// <returns>a function to perform, never null</returns>
public static Func <Task <T> > SelectFunction <T>(this IGateContext context, GatedCode.Modes mode, Func <bool> conditionalPredicate,
GatedAsyncFunc <T>[] functions, bool keepContext)
{
Tuple <GatedAsyncFunc <T>, IGate[]> action = SelectCode(context, conditionalPredicate, functions);
if (action?.Item1 == null)
{
return(() => Task.FromResult(default(T)));
}
return(async() =>
{
context.EnterScopes(mode, action.Item2);
try
{
if (action.Item1.Func != null)
{
return await action.Item1.Func().ConfigureAwait(keepContext);
}
}
finally
{
context.ExitScopes(mode, action.Item2);
}
return default(T);
});
}
/// <summary>
/// Select an applicable function without executing it
/// </summary>
/// <param name="context">gate context</param>
/// <param name="mode">mode to run the gated code in</param>
/// <param name="functions">array of gated functions</param>
/// <returns>a function to perform, never null</returns>
public static Func <T, T> SelectFunction <T>(this IGateContext context, GatedCode.Modes mode, params GatedFunc <T, T>[] functions)
{
Tuple <GatedFunc <T, T>, IGate[]> action = SelectCode(context, null, functions);
if (action != null && action.Item1 != null)
{
return(new Func <T, T>(
(t) =>
{
context.EnterScopes(mode, action.Item2);
try
{
if (action.Item1.Func != null)
{
return action.Item1.Func(t);
}
}
finally
{
context.ExitScopes(mode, action.Item2);
}
return t;
}));
}
return(new Func <T, T>((t) => t));
}
/// <summary>
/// Select an applicable function without executing it
/// </summary>
/// <typeparam name="T">Generic type</typeparam>
/// <param name="context">gate context</param>
/// <param name="mode">mode to run the gated code in</param>
/// <param name="conditionalPredicate">The conditional predicate.</param>
/// <param name="functions">array of gated functions</param>
/// <returns>a function to perform, never null</returns>
public static Func <T> SelectFunction <T>(this IGateContext context, GatedCode.Modes mode, Func <bool> conditionalPredicate,
params GatedFunc <T>[] functions)
{
Tuple <GatedFunc <T>, IGate[]> action = SelectCode(context, conditionalPredicate, functions);
if (action != null && action.Item1 != null)
{
return(new Func <T>(
() =>
{
context.EnterScopes(mode, action.Item2);
try
{
if (action.Item1.Func != null)
{
return action.Item1.Func();
}
}
finally
{
context.ExitScopes(mode, action.Item2);
}
return default(T);
}));
}
return(new Func <T>(() => default(T)));
}
/// <summary>
/// Select an applicable action without executing it
/// </summary>
/// <param name="context">gate context</param>
/// <param name="mode">mode to run the gated code in</param>
/// <param name="conditionalPredicate">The conditional predicate.</param>
/// <param name="actions">array of gated actions</param>
/// <param name="keepContext">controls whether async operation should keep the synchronization context</param>
/// <remarks>
/// keep context should be set to true in code which is async end to end,
/// and false in other cases to avoid deadlocking
/// </remarks>
/// <returns>an action to perform, never null</returns>
public static Func <Task> SelectAction(this IGateContext context, GatedCode.Modes mode, Func <bool> conditionalPredicate, GatedAsyncAction[] actions, bool keepContext = false)
{
Tuple <GatedAsyncAction, IGate[]> action = SelectCode(context, conditionalPredicate, actions);
if (action?.Item1 == null)
{
return(s_noOpAction);
}
return(async() =>
{
context.EnterScopes(mode, action.Item2);
try
{
if (action.Item1?.Action != null)
{
await action.Item1.Action().ConfigureAwait(keepContext);
}
}
finally
{
context.ExitScopes(mode, action.Item2);
}
});
}
/// <summary>
/// Select an applicable action without executing it
/// </summary>
/// <param name="context">gate context</param>
/// <param name="mode">mode to run the gated code in</param>
/// <param name="conditionalPredicate">The conditional predicate.</param>
/// <param name="actions">array of gated actions</param>
/// <returns>an action to perform, never null</returns>
public static Action SelectAction(this IGateContext context, GatedCode.Modes mode, Func <bool> conditionalPredicate, params GatedAction[] actions)
{
Tuple <GatedAction, IGate[]> action = SelectCode(context, conditionalPredicate, actions);
if (action != null && action.Item1 != null)
{
return(new Action(
() =>
{
context.EnterScopes(mode, action.Item2);
try
{
action.Item1.Action?.Invoke();
}
finally
{
context.ExitScopes(mode, action.Item2);
}
}));
}
return(new Action(() => { }));
}