oxihuman_core/
service_locator.rs

1// Copyright (C) 2026 COOLJAPAN OU (Team KitaSan)
2// SPDX-License-Identifier: Apache-2.0
3#![allow(dead_code)]
4
5//! A service locator registry that maps type-tagged names to boxed trait objects.
6
7use std::collections::HashMap;
8
9/// Descriptor of a registered service.
10#[allow(dead_code)]
11#[derive(Debug, Clone)]
12pub struct ServiceDescriptor {
13    pub name: String,
14    pub type_tag: String,
15    pub version: u32,
16    pub enabled: bool,
17}
18
19/// Service locator holding named service descriptors and opaque payloads as JSON strings.
20#[allow(dead_code)]
21pub struct ServiceLocator {
22    services: HashMap<String, ServiceDescriptor>,
23    payloads: HashMap<String, String>,
24    lookup_count: u64,
25}
26
27#[allow(dead_code)]
28impl ServiceLocator {
29    pub fn new() -> Self {
30        Self {
31            services: HashMap::new(),
32            payloads: HashMap::new(),
33            lookup_count: 0,
34        }
35    }
36
37    pub fn register(&mut self, name: &str, type_tag: &str, version: u32, payload: &str) {
38        let desc = ServiceDescriptor {
39            name: name.to_string(),
40            type_tag: type_tag.to_string(),
41            version,
42            enabled: true,
43        };
44        self.services.insert(name.to_string(), desc);
45        self.payloads.insert(name.to_string(), payload.to_string());
46    }
47
48    pub fn unregister(&mut self, name: &str) -> bool {
49        self.payloads.remove(name);
50        self.services.remove(name).is_some()
51    }
52
53    pub fn lookup(&mut self, name: &str) -> Option<&ServiceDescriptor> {
54        self.lookup_count += 1;
55        let enabled = self.services.get(name).is_some_and(|s| s.enabled);
56        if enabled {
57            self.services.get(name)
58        } else {
59            None
60        }
61    }
62
63    pub fn payload(&self, name: &str) -> Option<&str> {
64        self.payloads.get(name).map(|s| s.as_str())
65    }
66
67    pub fn set_enabled(&mut self, name: &str, enabled: bool) -> bool {
68        if let Some(s) = self.services.get_mut(name) {
69            s.enabled = enabled;
70            true
71        } else {
72            false
73        }
74    }
75
76    pub fn is_registered(&self, name: &str) -> bool {
77        self.services.contains_key(name)
78    }
79
80    pub fn count(&self) -> usize {
81        self.services.len()
82    }
83
84    pub fn lookup_count(&self) -> u64 {
85        self.lookup_count
86    }
87
88    pub fn names(&self) -> Vec<&str> {
89        let mut v: Vec<&str> = self.services.keys().map(|s| s.as_str()).collect();
90        v.sort_unstable();
91        v
92    }
93
94    pub fn by_type(&self, type_tag: &str) -> Vec<&ServiceDescriptor> {
95        let mut v: Vec<&ServiceDescriptor> = self
96            .services
97            .values()
98            .filter(|s| s.type_tag == type_tag)
99            .collect();
100        v.sort_by(|a, b| a.name.cmp(&b.name));
101        v
102    }
103
104    pub fn clear(&mut self) {
105        self.services.clear();
106        self.payloads.clear();
107    }
108}
109
110impl Default for ServiceLocator {
111    fn default() -> Self {
112        Self::new()
113    }
114}
115
116pub fn new_service_locator() -> ServiceLocator {
117    ServiceLocator::new()
118}
119
120#[cfg(test)]
121mod tests {
122    use super::*;
123
124    #[test]
125    fn register_and_lookup() {
126        let mut loc = new_service_locator();
127        loc.register("logger", "Logger", 1, "{}");
128        let d = loc.lookup("logger").expect("should succeed");
129        assert_eq!(d.name, "logger");
130    }
131
132    #[test]
133    fn lookup_missing_returns_none() {
134        let mut loc = new_service_locator();
135        assert!(loc.lookup("nope").is_none());
136    }
137
138    #[test]
139    fn unregister() {
140        let mut loc = new_service_locator();
141        loc.register("svc", "T", 1, "");
142        assert!(loc.unregister("svc"));
143        assert!(!loc.is_registered("svc"));
144    }
145
146    #[test]
147    fn disabled_not_found() {
148        let mut loc = new_service_locator();
149        loc.register("svc", "T", 1, "");
150        loc.set_enabled("svc", false);
151        assert!(loc.lookup("svc").is_none());
152    }
153
154    #[test]
155    fn payload_retrieved() {
156        let mut loc = new_service_locator();
157        loc.register("svc", "T", 1, r#"{"key":"val"}"#);
158        assert_eq!(loc.payload("svc"), Some(r#"{"key":"val"}"#));
159    }
160
161    #[test]
162    fn by_type_filter() {
163        let mut loc = new_service_locator();
164        loc.register("a", "Renderer", 1, "");
165        loc.register("b", "Audio", 1, "");
166        loc.register("c", "Renderer", 2, "");
167        let r = loc.by_type("Renderer");
168        assert_eq!(r.len(), 2);
169    }
170
171    #[test]
172    fn lookup_count_increments() {
173        let mut loc = new_service_locator();
174        loc.register("x", "T", 1, "");
175        loc.lookup("x");
176        loc.lookup("x");
177        assert_eq!(loc.lookup_count(), 2);
178    }
179
180    #[test]
181    fn count_correct() {
182        let mut loc = new_service_locator();
183        loc.register("a", "T", 1, "");
184        loc.register("b", "T", 1, "");
185        assert_eq!(loc.count(), 2);
186    }
187
188    #[test]
189    fn clear_empties() {
190        let mut loc = new_service_locator();
191        loc.register("a", "T", 1, "");
192        loc.clear();
193        assert_eq!(loc.count(), 0);
194    }
195
196    #[test]
197    fn names_sorted() {
198        let mut loc = new_service_locator();
199        loc.register("b", "T", 1, "");
200        loc.register("a", "T", 1, "");
201        assert_eq!(loc.names(), vec!["a", "b"]);
202    }
203}
oxihuman_core/service_locator.rs

oxihuman_core/
service_locator.rs
