/// <summary>
/// 通过脚本动态确定用户列表
/// </summary>
/// <param name="script"></param>
/// <param name="flowDynamicUserName"></param>
/// <param name="flowInstance"></param>
/// <returns></returns>
private static List <UserDTO> ResolveFlowDynamicUser(
string script, string flowDynamicUserName, FlowInstance flowInstance)
{
#region 初始化执行环境
var _session = new DictionaryContext();
_session.globals.Add("flowInstance", flowInstance);
var _references = new Assembly[] { typeof(DictionaryContext).Assembly,
typeof(System.Runtime.CompilerServices.DynamicAttribute).Assembly,
typeof(Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo).Assembly,
typeof(ExpandoObject).Assembly,
typeof(JsonConvert).Assembly,
typeof(ExpandoObjectConverter).Assembly,
typeof(Paticipant).Assembly,
typeof(UserDTO).Assembly,
typeof(FlowInstance).Assembly,
typeof(List <>).Assembly };
var _imports = new string[] { typeof(DictionaryContext).Namespace,
typeof(System.Runtime.CompilerServices.DynamicAttribute).Namespace,
typeof(Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo).Namespace,
typeof(ExpandoObject).Namespace,
typeof(JsonConvert).Namespace,
typeof(ExpandoObjectConverter).Namespace,
typeof(Paticipant).Namespace,
typeof(UserDTO).Namespace,
typeof(FlowInstance).Namespace,
typeof(List <>).Namespace };
var _options = ScriptOptions.Default
.AddReferences(_references)
.AddImports(_imports);
#endregion
#region 执行
try
{
var result = CSharpScript.RunAsync(script,
globals: _session, options: _options).Result.ReturnValue;
return((List <UserDTO>)result);
}
catch (Exception ex) // 默默记录到日志并继续执行
{
var _ex = ex;
logger.Error(ex.Message,
"运行脚本解析流程动态用户出错, 流程实例id:{0}; 流程动态用户名:{1}; ",
flowInstance.flowInstanceId, flowDynamicUserName);
return(null);
}
#endregion
}
ExecuteAutoRulesAsync(List <ConditionRule> autoRules,
string bizDataPayloadJson, string optionalFlowActionDataJson,
FlowInstance flowInstance)
{
#region 各类执行前合法性检查
if (autoRules == null || autoRules.Count() == 0)
{
logger.Error("自动规则脚本集为空,流程实例无法继续执行: 流程实例id:{0}; 活动名:{1};",
flowInstance.flowInstanceId, flowInstance.currentActivityName);
}
#endregion
#region 初始化各类辅助环境参数
var _ttl = 5;
var _session = new DictionaryContext();
var _references = new Assembly[] { typeof(DictionaryContext).Assembly,
typeof(System.Runtime.CompilerServices.DynamicAttribute).Assembly,
typeof(Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo).Assembly,
typeof(System.Dynamic.ExpandoObject).Assembly,
typeof(JsonConvert).Assembly,
typeof(ExpandoObjectConverter).Assembly,
typeof(Paticipant).Assembly,
typeof(UserDTO).Assembly,
typeof(Logger).Assembly, };
var _imports = new string[] { typeof(DictionaryContext).Namespace,
typeof(System.Runtime.CompilerServices.DynamicAttribute).Namespace,
typeof(Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo).Namespace,
typeof(System.Dynamic.ExpandoObject).Namespace,
typeof(JsonConvert).Namespace,
typeof(ExpandoObjectConverter).Namespace,
typeof(Paticipant).Namespace,
typeof(UserDTO).Namespace, };
var _options = ScriptOptions.Default
.AddReferences(_references)
.AddImports(_imports);
//脚本环境可用的两个动态全局变量
#region 一些尝试代码
//dynamic biz = parseJsonToDynamicObject(bizDataPayloadJson);
//_session.globals.Add("BizData",
// JsonConvert.DeserializeObject<ExpandoObject>(
// bizDataPayloadJson, new ExpandoObjectConverter()));
//_session.globals.Add("FlowActionData",
// JsonConvert.DeserializeObject<ExpandoObject>(
// optionalFlowActionDataJson, new ExpandoObjectConverter()));
//string buildBizData = @"dynamic BizData = JsonConvert.DeserializeObject<ExpandoObject>((string)globals[""BizDataJson""], new ExpandoObjectConverter());";
#endregion
_session.globals.Add("BizDataJson", bizDataPayloadJson);
_session.globals.Add("FlowActionDataJson", optionalFlowActionDataJson);
string buildBizData = parseJsonToDynamicCode(bizDataPayloadJson, "BizData");
string buildFlowActionData = parseJsonToDynamicCode(optionalFlowActionDataJson, "FlowActionData");
ScriptState <object> state = null;
#endregion
#region 反复运行自动规则脚本集数次,直到确定无法返回(借鉴了Angular 1的做法)
Dictionary <string, string> ruleCodeDict =
new Dictionary <string, string>(autoRules.Count());
while (_ttl > 0)
{
foreach (var rule in autoRules)
{
var codeDecoded = "";
try
{
#region 因为自动规则脚本进行了base64编码,为保证性能对解码的脚本进行缓存
if (ruleCodeDict.ContainsKey(rule.guid))
{
codeDecoded = ruleCodeDict[rule.guid];
}
else
{
codeDecoded = Encoding.UTF8.GetString(Convert.FromBase64String(rule.code));
ruleCodeDict.Add(rule.guid, codeDecoded);
}
#endregion
#region 执行脚本
state = state == null ?
await CSharpScript.RunAsync( // 如果是首次运行,需要在脚本前面加入生成BizData对象的动态代码
buildBizData + buildFlowActionData + codeDecoded,
globals : _session, options : _options)
:
await state.ContinueWithAsync(
codeDecoded, options : _options);
#endregion
}
catch (Exception ex) // 默默记录到日志并继续执行
{
var _ex = ex;
logger.Error(ex.Message,
"运行自动规则脚本出错, 流程实例id:{0}; 活动名:{1}; 规则名:{2}; 规则代码(已解码): {3};规则代码(未解码): {4};",
flowInstance.flowInstanceId, flowInstance.currentActivityName,
rule.name, codeDecoded, rule.code);
}
if (state != null && state.ReturnValue != null &&
state.ReturnValue is bool && (bool)state.ReturnValue) // 如果返回值为true
{
var _paticipants = rule.paticipants;
//如果在自动规则脚本里自行创建了类型为List<Paticipant>的名为Paticipants的对象,
//则覆盖规则定义里默认的paticipants值
if (_session.globals.ContainsKey("Paticipants") &&
_session.globals["Paticipants"] is List <Paticipant> )
{
_paticipants = (List <Paticipant>)_session.globals["Paticipants"];
}
logger.Trace("运行自动规则脚本获得生效的规则, 流程实例id:{0}; 活动名:{1}; 规则名:{2};",
flowInstance.flowInstanceId, flowInstance.currentActivityName, rule.name);
return(new Tuple <string, List <Paticipant> >(
rule.connectionGuid, _paticipants));
}
}
_ttl--;
}
#endregion
#region 确保返回一个规则结果, 如果上面没有获得生效的规则, 取首个默认退出规则(如果有)或最后一个规则
var firstDefault = autoRules.First(rule => rule.isDefault);
if (firstDefault != null)
{
logger.Warn(@"运行自动规则脚本集未能获得生效的规则,取首个默认退出规则, \
流程实例id:{0}; 活动名:{1}; 规则名:{2};",
flowInstance.flowInstanceId, flowInstance.currentActivityName, firstDefault.name);
return(new Tuple <string, List <Paticipant> >(
firstDefault.connectionGuid, firstDefault.paticipants));
}
else
{
var _lastIdx = autoRules.Count() - 1;
logger.Warn(@"运行自动规则脚本集未能获得生效的规则,取最后一个规则, \
流程实例id:{0}; 活动名:{1}; 规则名:{2};",
flowInstance.flowInstanceId, flowInstance.currentActivityName, autoRules[_lastIdx].name);
return(new Tuple <string, List <Paticipant> >(
autoRules[_lastIdx].connectionGuid,
autoRules[_lastIdx].paticipants));
}
#endregion
}