292 lines
12 KiB
C#
292 lines
12 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace MW.WorkFlow
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{
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/// <summary>
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/// 定义工作流的结构，包含所有活动及其跳转规则。
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/// </summary>
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public class WorkflowDefinition
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{
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private readonly Dictionary<string, WorkflowStep> _steps;
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public string InitialStepId { get; private set; }
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public WorkflowDefinition(string initialStepId)
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{
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InitialStepId = initialStepId ?? throw new ArgumentNullException(nameof(initialStepId));
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_steps = new Dictionary<string, WorkflowStep>();
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}
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/// <summary>
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/// 添加一个工作流步骤到定义中。
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/// </summary>
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/// <param name="step">要添加的步骤。</param>
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public void AddStep(WorkflowStep step)
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{
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if (step == null) throw new ArgumentNullException(nameof(step));
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if (_steps.ContainsKey(step.Id))
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{
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throw new ArgumentException($"工作流步骤ID '{step.Id}' 已存在。");
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}
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_steps.Add(step.Id, step);
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}
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/// <summary>
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/// 根据ID获取工作流步骤。
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/// </summary>
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/// <param name="stepId">步骤的唯一ID。</param>
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/// <returns>对应的 WorkflowStep。</returns>
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public WorkflowStep GetStep(string stepId)
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{
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if (_steps.TryGetValue(stepId, out var step))
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{
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return step;
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}
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throw new ArgumentException($"未找到ID为 '{stepId}' 的工作流步骤。");
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}
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public bool ContainsStep(string stepId)
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{
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return !string.IsNullOrWhiteSpace(stepId) && _steps.ContainsKey(stepId);
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}
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/// <summary>
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/// 获取所有步骤的ID列表。
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/// </summary>
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public IEnumerable<string> GetAllStepIds() => _steps.Keys;
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}
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/// <summary>
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/// 表示工作流中的一个步骤，包含一个活动和可能的条件跳转。
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/// </summary>
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public class WorkflowStep
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{
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public string Id { get; } // 步骤的唯一标识符
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public IActivity Activity { get; } // 该步骤要执行的活动
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public string FlowName { get; private set; } // 所属流程名称，用于界面显示和断点定位
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public string NextStepId { get; private set; } // 默认的下一个步骤ID
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public List<JumpCondition> JumpConditions { get; } // 条件跳转列表
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public WorkflowStep(string id, IActivity activity)
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{
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Id = id ?? throw new ArgumentNullException(nameof(id));
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Activity = activity ?? throw new ArgumentNullException(nameof(activity));
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JumpConditions = new List<JumpCondition>();
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}
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/// <summary>
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/// 设置默认的下一个步骤ID。
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/// </summary>
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public WorkflowStep WithNextStep(string nextStepId)
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{
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NextStepId = nextStepId;
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return this;
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}
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public WorkflowStep WithFlowName(string flowName)
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{
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FlowName = flowName;
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return this;
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}
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/// <summary>
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/// 添加一个条件跳转。
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/// </summary>
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/// <param name="condition">跳转条件。</param>
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/// <param name="targetStepId">满足条件时要跳转到的目标步骤ID。</param>
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public WorkflowStep AddJumpCondition(Func<WorkflowContext, ActivityResult, bool> condition, string targetStepId)
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{
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JumpConditions.Add(new JumpCondition(condition, targetStepId));
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return this;
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}
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public WorkflowStep AddDynamicJumpCondition(Func<WorkflowContext, ActivityResult, bool> condition, Func<WorkflowContext, ActivityResult, string> targetStepResolver)
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{
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JumpConditions.Add(new JumpCondition(condition, targetStepResolver));
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return this;
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}
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public WorkflowStep AddJumpOnContextValue<T>(string contextKey, T expectedValue, string targetStepId)
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{
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if (string.IsNullOrWhiteSpace(contextKey)) throw new ArgumentNullException(nameof(contextKey));
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return AddJumpCondition(
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(ctx, result) => ctx != null &&
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ctx.TryGetData<T>(contextKey, out var actualValue) &&
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EqualityComparer<T>.Default.Equals(actualValue, expectedValue),
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targetStepId);
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}
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public WorkflowStep AddJumpOnContextValueOnSuccess<T>(string contextKey, T expectedValue, string targetStepId)
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{
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if (string.IsNullOrWhiteSpace(contextKey)) throw new ArgumentNullException(nameof(contextKey));
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return AddJumpCondition(
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(ctx, result) => result == ActivityResult.Success &&
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ctx != null &&
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ctx.TryGetData<T>(contextKey, out var actualValue) &&
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EqualityComparer<T>.Default.Equals(actualValue, expectedValue),
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targetStepId);
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}
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public WorkflowStep AddJumpOnRouteValue<T>(string routeKey, T expectedValue, string targetStepId)
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{
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if (string.IsNullOrWhiteSpace(routeKey)) throw new ArgumentNullException(nameof(routeKey));
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return AddJumpCondition(
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(ctx, result) => ctx != null &&
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ctx.TryGetRoute<T>(routeKey, out var actualValue) &&
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EqualityComparer<T>.Default.Equals(actualValue, expectedValue),
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targetStepId);
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}
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public WorkflowStep AddJumpOnRouteValueOnSuccess<T>(string routeKey, T expectedValue, string targetStepId)
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{
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if (string.IsNullOrWhiteSpace(routeKey)) throw new ArgumentNullException(nameof(routeKey));
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return AddJumpCondition(
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(ctx, result) => result == ActivityResult.Success &&
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ctx != null &&
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ctx.TryGetRoute<T>(routeKey, out var actualValue) &&
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EqualityComparer<T>.Default.Equals(actualValue, expectedValue),
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targetStepId);
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}
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public WorkflowStep AddRouteBranchOnSuccess<T>(string routeKey, IDictionary<T, string> routeTargets)
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{
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if (string.IsNullOrWhiteSpace(routeKey)) throw new ArgumentNullException(nameof(routeKey));
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if (routeTargets == null) throw new ArgumentNullException(nameof(routeTargets));
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return AddDynamicJumpCondition(
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(ctx, result) => result == ActivityResult.Success && TryResolveRouteBranchTarget(ctx, routeKey, routeTargets, out var _),
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(ctx, result) => ResolveRouteBranchTarget(ctx, routeKey, routeTargets));
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}
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public WorkflowStep AddRouteBranch<T>(ActivityResult expectedResult, string routeKey, IDictionary<T, string> routeTargets)
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{
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if (string.IsNullOrWhiteSpace(routeKey)) throw new ArgumentNullException(nameof(routeKey));
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if (routeTargets == null) throw new ArgumentNullException(nameof(routeTargets));
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return AddDynamicJumpCondition(
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(ctx, result) => result == expectedResult && TryResolveRouteBranchTarget(ctx, routeKey, routeTargets, out var _),
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(ctx, result) => ResolveRouteBranchTarget(ctx, routeKey, routeTargets));
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}
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public WorkflowStep AddRouteJump(string routeContextKey = "WorkflowRoutes")
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{
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return AddDynamicJumpCondition(
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(ctx, result) => TryResolveRouteTarget(ctx, routeContextKey, out var _),
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(ctx, result) => ResolveRouteTarget(ctx, routeContextKey));
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}
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public WorkflowStep AddRouteJumpOnSuccess(string routeContextKey = "WorkflowRoutes")
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{
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return AddDynamicJumpCondition(
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(ctx, result) => result == ActivityResult.Success && TryResolveRouteTarget(ctx, routeContextKey, out var _),
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(ctx, result) => ResolveRouteTarget(ctx, routeContextKey));
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}
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// 可以添加更多方便的条件方法，例如：
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public WorkflowStep AddJumpOnSuccess(string targetStepId)
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{
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return AddJumpCondition((ctx, result) => result == ActivityResult.Success, targetStepId);
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}
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public WorkflowStep AddJumpOnFailure(string targetStepId)
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{
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return AddJumpCondition((ctx, result) => result == ActivityResult.Failure, targetStepId);
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}
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public WorkflowStep AddJumpOnCanceled(string targetStepId)
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{
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return AddJumpCondition((ctx, result) => result == ActivityResult.Canceled, targetStepId);
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}
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private bool TryResolveRouteTarget(WorkflowContext context, string routeContextKey, out string targetStepId)
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{
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if (context != null &&
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context.TryGetData<IDictionary<string, string>>(routeContextKey, out var routes) &&
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routes != null &&
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routes.TryGetValue(Id, out targetStepId) &&
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!string.IsNullOrWhiteSpace(targetStepId))
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{
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return true;
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}
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targetStepId = null;
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return false;
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}
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private string ResolveRouteTarget(WorkflowContext context, string routeContextKey)
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{
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if (TryResolveRouteTarget(context, routeContextKey, out var targetStepId))
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{
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return targetStepId;
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}
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throw new InvalidOperationException($"步骤 '{Id}' 未找到有效的路由目标。上下文键: '{routeContextKey}'。");
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}
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private bool TryResolveRouteBranchTarget<T>(WorkflowContext context, string routeKey, IDictionary<T, string> routeTargets, out string targetStepId)
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{
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if (context != null &&
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context.TryGetRoute<T>(routeKey, out var routeValue) &&
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routeTargets != null &&
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routeTargets.TryGetValue(routeValue, out targetStepId) &&
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!string.IsNullOrWhiteSpace(targetStepId))
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{
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return true;
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}
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targetStepId = null;
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return false;
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}
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private string ResolveRouteBranchTarget<T>(WorkflowContext context, string routeKey, IDictionary<T, string> routeTargets)
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{
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if (TryResolveRouteBranchTarget(context, routeKey, routeTargets, out var targetStepId))
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{
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return targetStepId;
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}
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throw new InvalidOperationException($"步骤 '{Id}' 未找到匹配的路由分支。路由键: '{routeKey}'。");
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}
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}
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/// <summary>
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/// 定义一个条件跳转规则。
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/// </summary>
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public class JumpCondition
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{
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public Func<WorkflowContext, ActivityResult, bool> Condition { get; } // 判断是否跳转的条件
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public string TargetStepId { get; } // 满足条件时跳转到的目标步骤ID
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private readonly Func<WorkflowContext, ActivityResult, string> _targetStepResolver;
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public JumpCondition(Func<WorkflowContext, ActivityResult, bool> condition, string targetStepId)
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: this(condition, (ctx, result) => targetStepId)
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{
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TargetStepId = targetStepId ?? throw new ArgumentNullException(nameof(targetStepId));
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}
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public JumpCondition(Func<WorkflowContext, ActivityResult, bool> condition, Func<WorkflowContext, ActivityResult, string> targetStepResolver)
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{
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Condition = condition ?? throw new ArgumentNullException(nameof(condition));
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_targetStepResolver = targetStepResolver ?? throw new ArgumentNullException(nameof(targetStepResolver));
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}
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public string ResolveTargetStepId(WorkflowContext context, ActivityResult result)
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{
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var targetStepId = _targetStepResolver(context, result);
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if (string.IsNullOrWhiteSpace(targetStepId))
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{
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throw new InvalidOperationException("跳转目标步骤ID不能为空。");
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}
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return targetStepId;
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}
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}
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}
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