/// <summary>
/// Invokes an action for each item of a sequence. Each thrown exception while invokation
/// is collected and thrown or returned as an <see cref="AggregateException" />.
/// </summary>
/// <typeparam name="T">Type of the items of the sequence.</typeparam>
/// <param name="items">The sequence.</param>
/// <param name="action">The action to invoke for an item of <paramref name="items" />.</param>
/// <param name="throwExceptions">Throw exception (<see langword="true" />) or return them (<see langword="false" />).</param>
/// <returns>The list of thrown exception or <see langword="null" /> if no exception was thrown.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="items" /> and/or <paramref name="action" />
/// are <see langword="null" />.
/// </exception>
/// <exception cref="AggregateException">
/// At leat one exception was thrown. This only works if <paramref name="throwExceptions" />
/// is <see langword="true" />.
/// </exception>
public static AggregateException ForAll <T>(IEnumerable <T> items,
Action <IForAllItemExecutionContext <T> > action,
bool throwExceptions)
{
if (action == null)
{
throw new ArgumentNullException("action");
}
return(ForAll <T, object>(items,
delegate(IForAllItemExecutionContext <T, object> ctx)
{
SimpleForAllItemExecutionContext <T> ctxClone = new SimpleForAllItemExecutionContext <T>();
ctxClone.Item = ctx.Item;
action(ctxClone);
},
(object)null,
throwExceptions));
}
/// <summary>
/// Invokes an action for each item of a sequence. Each thrown exception while invokation
/// is collected and thrown or returned as an <see cref="AggregateException" />.
/// </summary>
/// <typeparam name="T">Type of the items of the sequence.</typeparam>
/// <typeparam name="S">Type of the second paramater of <paramref name="action" />.</typeparam>
/// <param name="items">The sequence.</param>
/// <param name="action">The action to invoke for an item of <paramref name="items" />.</param>
/// <param name="actionStateFactory">
/// The factory delegate that produces the value for the state argument of <paramref name="action" />.
/// </param>
/// <param name="throwExceptions">Throw exception (<see langword="true" />) or return them (<see langword="false" />).</param>
/// <returns>The list of thrown exception or <see langword="null" /> if no exception was thrown.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="items" />, <paramref name="action" /> and/or <paramref name="actionStateFactory" />
/// are <see langword="null" />.
/// </exception>
/// <exception cref="AggregateException">
/// At leat one exception was thrown. This only works if <paramref name="throwExceptions" />
/// is <see langword="true" />.
/// </exception>
public static AggregateException ForAll <T, S>(IEnumerable <T> items,
Action <IForAllItemExecutionContext <T, S> > action,
Func <T, long, S> actionStateFactory,
bool throwExceptions)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
if (action == null)
{
throw new ArgumentNullException("action");
}
if (actionStateFactory == null)
{
throw new ArgumentNullException("actionStateFactory");
}
List <Exception> exceptions = new List <Exception>();
try
{
using (IEnumerator <T> enumerator = items.GetEnumerator())
{
long index = -1;
while (enumerator.MoveNext())
{
SimpleForAllItemExecutionContext <T, S> ctx = new SimpleForAllItemExecutionContext <T, S>();
try
{
ctx.Index = ++index;
ctx.Item = enumerator.Current;
ctx.State = actionStateFactory(ctx.Item, ctx.Index);
action(ctx);
}
catch (Exception ex)
{
exceptions.Add(new ForAllItemExecutionException <T, S>(ctx, ex));
}
}
}
}
catch (Exception ex)
{
exceptions.Add(ex);
}
AggregateException result = null;
if (exceptions.Count > 0)
{
result = new AggregateException(exceptions);
}
if (result != null &&
throwExceptions)
{
throw result;
}
return(result);
}
// Public Methods (1)
/// <summary>
/// Invokes an action for each item of a sequence. Each thrown exception while invokation
/// is collected and thrown or returned as a single <see cref="AggregateException" />.
/// The invokation of each action is done in an async thread, but it is wait until all actions were executed.
/// </summary>
/// <typeparam name="T">Type of the items of the sequence.</typeparam>
/// <typeparam name="S">Type of the second paramater of <paramref name="action" />.</typeparam>
/// <param name="items">The sequence.</param>
/// <param name="action">The action to invoke for an item of <paramref name="items" />.</param>
/// <param name="actionStateFactory">
/// The factory delegate that produces the value for the state argument of <paramref name="action" />.
/// </param>
/// <param name="throwExceptions">Throw exception (<see langword="true" />) or return them (<see langword="false" />).</param>
/// <returns>The list of thrown exception or <see langword="null" /> if no exception was thrown.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="items" />, <paramref name="action" /> and/or <paramref name="actionStateFactory" />
/// are <see langword="null" />.
/// </exception>
/// <exception cref="AggregateException">
/// At leat one exception was thrown. This only works if <paramref name="throwExceptions" />
/// is <see langword="true" />.
/// </exception>
public static AggregateException ForAllAsync <T, S>(IEnumerable <T> items,
Action <IForAllItemExecutionContext <T, S> > action,
Func <T, long, S> actionStateFactory,
bool throwExceptions)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
if (action == null)
{
throw new ArgumentNullException("action");
}
if (actionStateFactory == null)
{
throw new ArgumentNullException("actionStateFactory");
}
var exceptions = new List <Exception>();
var syncRoot = new object();
// create tuples from items
long itemIndex = -1;
var tuples = items.Select(i => new ForAllTuple <T, S>(
action: action,
actionStateFactory: actionStateFactory,
exceptions: exceptions,
index: ++itemIndex,
item: i,
syncRoot: syncRoot
));
// create tasks from tuples
var tasks = tuples.Select(t =>
{
return(new Task(action:
(state) =>
{
var tuple = (ForAllTuple <T, S>)state;
var ctx = new SimpleForAllItemExecutionContext <T, S>();
try
{
ctx.Index = tuple.INDEX;
ctx.Item = tuple.ITEM;
ctx.State = tuple.ACTION_STATE_FACTORY(ctx.Item, ctx.Index);
tuple.ACTION(ctx);
}
catch (Exception ex)
{
lock (tuple.SYNC)
{
tuple.EXCEPTION_LIST
.Add(new ForAllItemExecutionException <T, S>(ctx, ex));
}
}
}, state: t));
});
// start tasks and wait
try
{
var runningTasks = new List <Task>();
using (var enumerator = tasks.GetEnumerator())
{
while (enumerator.MoveNext())
{
try
{
var t = enumerator.Current;
t.Start();
runningTasks.Add(t);
}
catch (Exception ex)
{
lock (syncRoot)
{
exceptions.Add(ex);
}
}
}
}
TaskHelper.WaitAll(runningTasks);
runningTasks.Clear();
}
catch (Exception ex)
{
lock (syncRoot)
{
exceptions.Add(ex);
}
}
AggregateException result = null;
lock (syncRoot)
{
if (exceptions.Count > 0)
{
result = new AggregateException(exceptions);
}
}
if (result != null &&
throwExceptions)
{
throw result;
}
return(result);
}