【Orleans开胃菜系列1】不要被表象迷惑

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Orleans之开胃小菜

SafeExecute安全执行

翻看Orleans源码时，发现一句SafeExecute,就以为是什么没接触过的很深的东西。那么SafeExecute到底是什么玩意呢？

  Utils.SafeExecute(() =>

            {

                if (typeMapRefreshTimer != null)

                {

                    typeMapRefreshTimer.Dispose();

                    typeMapRefreshTimer = null;

                }

            }, logger, "Client.typeMapRefreshTimer.Dispose");

接下来追踪代码如下，原来主要逻辑就是加try,catch不引发异常。

 public static void SafeExecute(Action action, ILogger logger, Func<string> callerGetter)

        {

            try

            {

                action();

            }

            catch (Exception exc)

            {

                try

                {

                    if (logger != null)

                    {

                        string caller = null;

                        if (callerGetter != null)

                        {

                            try

                            {

                                caller = callerGetter();

                            }catch (Exception) { }

                        }

                        foreach (var e in exc.FlattenAggregate())

                        {

                            logger.Warn(ErrorCode.Runtime_Error_100325,

                                $"Ignoring {e.GetType().FullName} exception thrown from an action called by {caller ?? String.Empty}.", exc);

                        }

                    }

                }

                catch (Exception)

                {

                    // now really, really ignore.

                }

            }

        }
ExecuteWithRetries重试机制

还有例如以下代码,顾名思义就是支持重试执行

     await ExecuteWithRetries(

                async () => this.GrainTypeResolver = await transport.GetGrainTypeResolver(this.InternalGrainFactory),

                retryFilter);

跟踪源码如下：
综合考虑最晚执行时间，成功执行次数，失败执行次数等因素，延迟回调.
利用do..while,Task,Func等知识来完成延时重试，并不算太复杂。

 public static Task ExecuteWithRetries(

            Func<int, Task> action,

            int maxNumErrorTries,

            Func<Exception, int, bool> retryExceptionFilter,

            TimeSpan maxExecutionTime,

            IBackoffProvider onErrorBackOff)

        {

            Func<int, Task<bool>> function = async (int i) => { await action(i); return true; };

            return ExecuteWithRetriesHelper<bool>(

                function,

                0,

                0,

                maxNumErrorTries,

                maxExecutionTime,

                DateTime.UtcNow,

                null,

                retryExceptionFilter,

                null,

                onErrorBackOff);

        }

        private static async Task<T> ExecuteWithRetriesHelper<T>(

            Func<int, Task<T>> function,

            int callCounter,

            int maxNumSuccessTries,

            int maxNumErrorTries,

            TimeSpan maxExecutionTime,

            DateTime startExecutionTime,

            Func<T, int, bool> retryValueFilter = null,

            Func<Exception, int, bool> retryExceptionFilter = null,

            IBackoffProvider onSuccessBackOff = null,

            IBackoffProvider onErrorBackOff = null)

        {

            T result = default(T);

            ExceptionDispatchInfo lastExceptionInfo = null;

            bool retry;

            do

            {

                retry = false;

                if (maxExecutionTime != Constants.INFINITE_TIMESPAN && maxExecutionTime != default(TimeSpan))

                {

                    DateTime now = DateTime.UtcNow;

                    if (now - startExecutionTime > maxExecutionTime)

                    {

                        if (lastExceptionInfo == null)

                        {

                            throw new TimeoutException(

                                $"ExecuteWithRetries has exceeded its max execution time of {maxExecutionTime}. Now is {LogFormatter.PrintDate(now)}, started at {LogFormatter.PrintDate(startExecutionTime)}, passed {now - startExecutionTime}");

                        }

                        lastExceptionInfo.Throw();

                    }

                }

                int counter = callCounter;

                try

                {

                    callCounter++;

                    result = await function(counter);

                    lastExceptionInfo = null;

                    if (callCounter < maxNumSuccessTries || maxNumSuccessTries == INFINITE_RETRIES) // -1 for infinite retries

                    {

                        if (retryValueFilter != null)

                            retry = retryValueFilter(result, counter);

                    }

                    if (retry)

                    {

                        TimeSpan? delay = onSuccessBackOff?.Next(counter);

                        if (delay.HasValue)

                        {

                            await Task.Delay(delay.Value);

                        }

                    }

                }

                catch (Exception exc)

                {

                    retry = false;

                    if (callCounter < maxNumErrorTries || maxNumErrorTries == INFINITE_RETRIES)

                    {

                        if (retryExceptionFilter != null)

                            retry = retryExceptionFilter(exc, counter);

                    }

                    if (!retry)

                    {

                        throw;

                    }

                    lastExceptionInfo = ExceptionDispatchInfo.Capture(exc);

                    TimeSpan? delay = onErrorBackOff?.Next(counter);

                    if (delay.HasValue)

                    {

                        await Task.Delay(delay.Value);

                    }

                }

            } while (retry);

            return result;

        }

    }

耐心求索

很多基础性的实现并不完全依赖高深隐秘的技术，多思考，多实践。只要思路正确，慢慢修养，星星之火总能燎原。

众所周知，.net的应用层每隔几年总会变化，像aspx现在是完全放弃了的。.netcore现在日益火热，但不见的得持久恒定。在有限的时间内，为了不让知识贬值，除了快速学习新知识外，更要注意基础知识的沉淀。就像上面的两个例子，无论方法名，基础思想在那放着，不会太变质。

但这些是远远不够的。变化的永远是上层。沉淀到基础层次，如进程线程之类的，就比较稳定了。除了这些代码层次的，更重要的是思想的沉淀，如《人月神话》《失控》《领域驱动涉及》，敏捷开发等方法论，依然很有用，更加基础的冯诺依曼计算器体系结构更是奠基者。
理论才是跨各种语言平台的。只记得一些方法命名空间而根基不扎实的，是无根之木。

未来的日子，勉励自己继续扩充理论知识。

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