moduforge_rules_engine/
engine.rs

1use std::future::Future;
2use std::sync::Arc;
3
4use crate::decision::Decision;
5use crate::handler::custom_node_adapter::{CustomNodeAdapter, NoopCustomNode};
6use crate::handler::graph::DecisionGraphResponse;
7use crate::loader::{
8    ClosureLoader, DecisionLoader, LoaderResponse, LoaderResult, NoopLoader,
9};
10use crate::model::DecisionContent;
11use crate::EvaluationError;
12use moduforge_rules_expression::variable::Variable;
13use moduforge_rules_expression::functions::custom::CustomFunctionRegistry;
14
15/// 决策引擎结构体，用于生成和评估决策
16#[derive(Debug, Clone)]
17pub struct DecisionEngine<Loader, CustomNode>
18where
19    Loader: DecisionLoader + 'static,
20    CustomNode: CustomNodeAdapter + 'static,
21{
22    loader: Arc<Loader>,
23    adapter: Arc<CustomNode>,
24}
25
26#[derive(Debug, Default)]
27pub struct EvaluationOptions {
28    pub trace: Option<bool>,
29    pub max_depth: Option<u8>,
30}
31
32impl Default for DecisionEngine<NoopLoader, NoopCustomNode> {
33    fn default() -> Self {
34        Self {
35            loader: Arc::new(NoopLoader::default()),
36            adapter: Arc::new(NoopCustomNode::default()),
37        }
38    }
39}
40
41impl<L: DecisionLoader + 'static, A: CustomNodeAdapter + 'static>
42    DecisionEngine<L, A>
43{
44    pub fn new(
45        loader: Arc<L>,
46        adapter: Arc<A>,
47    ) -> Self {
48        Self { loader, adapter }
49    }
50
51    pub fn with_adapter<CustomNode>(
52        self,
53        adapter: Arc<CustomNode>,
54    ) -> DecisionEngine<L, CustomNode>
55    where
56        CustomNode: CustomNodeAdapter,
57    {
58        DecisionEngine { loader: self.loader, adapter }
59    }
60
61    pub fn with_loader<Loader>(
62        self,
63        loader: Arc<Loader>,
64    ) -> DecisionEngine<Loader, A>
65    where
66        Loader: DecisionLoader,
67    {
68        DecisionEngine { loader, adapter: self.adapter }
69    }
70
71    pub fn with_closure_loader<F, O>(
72        self,
73        loader: F,
74    ) -> DecisionEngine<ClosureLoader<F>, A>
75    where
76        F: Fn(String) -> O + Sync + Send,
77        O: Future<Output = LoaderResponse> + Send,
78    {
79        DecisionEngine {
80            loader: Arc::new(ClosureLoader::new(loader)),
81            adapter: self.adapter,
82        }
83    }
84
85    /// 使用 key 评估决策
86    pub async fn evaluate<K>(
87        &self,
88        key: K,
89        context: Variable,
90    ) -> Result<DecisionGraphResponse, Box<EvaluationError>>
91    where
92        K: AsRef<str>,
93    {
94        self.evaluate_with_opts(key, context, Default::default()).await
95    }
96    pub async fn evaluate_with_state_and_opts<K>(
97        &self,
98        key: K,
99        context: Variable,
100        state: Arc<moduforge_state::State>,
101        options: EvaluationOptions,
102    ) -> Result<DecisionGraphResponse, Box<EvaluationError>>
103    where
104        K: AsRef<str>,
105    {
106        // 设置 thread_local State
107        CustomFunctionRegistry::set_current_state(Some(state));
108
109        // 执行评估
110        let result = self.evaluate_with_opts(key, context, options).await;
111
112        // 清理 thread_local State
113        CustomFunctionRegistry::set_current_state(None);
114
115        result
116    }
117    /// 使用 State 评估决策 - 通过 thread_local 设置 State
118    pub async fn evaluate_with_state<K>(
119        &self,
120        key: K,
121        context: Variable,
122        state: Arc<moduforge_state::State>,
123    ) -> Result<DecisionGraphResponse, Box<EvaluationError>>
124    where
125        K: AsRef<str>,
126    {
127        // 设置 thread_local State
128        CustomFunctionRegistry::set_current_state(Some(state));
129
130        // 执行评估
131        let result = self.evaluate(key, context).await;
132
133        // 清理 thread_local State
134        CustomFunctionRegistry::set_current_state(None);
135
136        result
137    }
138
139    /// 使用 key 评估决策，并使用高级选项
140    pub async fn evaluate_with_opts<K>(
141        &self,
142        key: K,
143        context: Variable,
144        options: EvaluationOptions,
145    ) -> Result<DecisionGraphResponse, Box<EvaluationError>>
146    where
147        K: AsRef<str>,
148    {
149        let content = self.loader.load(key.as_ref()).await?;
150        let decision = self.create_decision(content);
151        decision.evaluate_with_opts(context, options).await
152    }
153
154    /// 从 DecisionContent 创建决策，用于更简单的绑定创建
155    pub fn create_decision(
156        &self,
157        content: Arc<DecisionContent>,
158    ) -> Decision<L, A> {
159        Decision::from(content)
160            .with_loader(self.loader.clone())
161            .with_adapter(self.adapter.clone())
162    }
163
164    /// 根据 loader 获取决策
165    pub async fn get_decision(
166        &self,
167        key: &str,
168    ) -> LoaderResult<Decision<L, A>> {
169        let content = self.loader.load(key).await?;
170        Ok(self.create_decision(content))
171    }
172
173    pub fn loader(&self) -> &L {
174        self.loader.as_ref()
175    }
176
177    pub fn adapter(&self) -> &A {
178        self.adapter.as_ref()
179    }
180}
moduforge_rules_engine/engine.rs

moduforge_rules_engine/
engine.rs
