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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading.Tasks;
namespace System.Xml {
internal static class AsyncHelper {
public static readonly Task DoneTask = Task.FromResult(true);
public static readonly Task<bool> DoneTaskTrue = Task.FromResult(true);
public static readonly Task<bool> DoneTaskFalse = Task.FromResult(false);
public static readonly Task<int> DoneTaskZero = Task.FromResult(0);
public static bool IsSuccess(this Task task) {
return task.IsCompleted && task.Exception == null;
}
public static Task CallVoidFuncWhenFinish(this Task task, Action func) {
if (task.IsSuccess()) {
func();
return DoneTask;
}
else {
return _CallVoidFuncWhenFinish(task, func);
}
}
private static async Task _CallVoidFuncWhenFinish(this Task task, Action func) {
await task.ConfigureAwait(false);
func();
}
public static Task<bool> ReturnTaskBoolWhenFinish(this Task task, bool ret) {
if (task.IsSuccess()) {
if (ret)
return DoneTaskTrue;
else
return DoneTaskFalse;
}
else {
return _ReturnTaskBoolWhenFinish(task, ret);
}
}
public static async Task<bool> _ReturnTaskBoolWhenFinish(this Task task, bool ret) {
await task.ConfigureAwait(false);
return ret;
}
public static Task CallTaskFuncWhenFinish(this Task task, Func<Task> func) {
if (task.IsSuccess()) {
return func();
}
else {
return _CallTaskFuncWhenFinish(task, func);
}
}
private static async Task _CallTaskFuncWhenFinish(Task task, Func<Task> func) {
await task.ConfigureAwait(false);
await func().ConfigureAwait(false);
}
public static Task<bool> CallBoolTaskFuncWhenFinish(this Task task, Func<Task<bool>> func) {
if (task.IsSuccess()) {
return func();
}
else {
return _CallBoolTaskFuncWhenFinish(task, func);
}
}
private static async Task<bool> _CallBoolTaskFuncWhenFinish(this Task task, Func<Task<bool>> func) {
await task.ConfigureAwait(false);
return await func().ConfigureAwait(false);
}
public static Task<bool> ContinueBoolTaskFuncWhenFalse(this Task<bool> task, Func<Task<bool>> func) {
if (task.IsSuccess()) {
if (task.Result)
return DoneTaskTrue;
else
return func();
}
else {
return _ContinueBoolTaskFuncWhenFalse(task, func);
}
}
private static async Task<bool> _ContinueBoolTaskFuncWhenFalse(Task<bool> task, Func<Task<bool>> func) {
if (await task.ConfigureAwait(false))
return true;
else
return await func().ConfigureAwait(false);
}
}
}
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