wplot/abs/
registry.rs

1/// Internal namespace.
2pub( crate ) mod private
3{
4  use crate::protected::*;
5  // use crate::abs::*;
6  use once_cell::sync::Lazy;
7  use std::sync::Mutex;
8  use dashmap::DashMap;
9  use std::sync::Arc;
10
11  /// Registry of contexts.
12  #[ derive( Debug ) ]
13  pub struct Registry< Context >
14  where
15    Context : ContextInterface,
16  {
17    contexts : DashMap< Id, Context >,
18    contexts_with_name : DashMap< String, Id >,
19    current_context_name : Option< String >,
20  }
21
22  impl< Context > Registry< Context >
23  where
24    Context : ContextInterface,
25  {
26
27    /// Static constructor.
28    pub const fn new() -> Lazy< Arc< Mutex< Registry< Context > > > >
29    {
30      Lazy::new( ||
31      {
32        let contexts = DashMap::new();
33        let contexts_with_name = DashMap::new();
34        let current_context_name = None;
35        Arc::new( Mutex::new( Registry::< Context >
36        {
37          contexts,
38          contexts_with_name,
39          current_context_name,
40        }))
41      })
42    }
43
44    /// Construct a new context.
45    pub fn current( _registry : &mut Lazy< Arc< Mutex< Registry< Context > > > >  ) -> Context::Changer
46    {
47      let registry = _registry.lock().unwrap();
48      let mut current_name : Option< String > = registry.current_context_name.clone();
49      if current_name.is_none()
50      {
51        current_name = Some( "default".into() )
52      }
53      let current_name = current_name.unwrap();
54      if registry.contexts_with_name.contains_key( &current_name )
55      {
56        let id = *registry.contexts_with_name.get( &current_name ).unwrap().value();
57        registry.contexts.get_mut( &id ).unwrap().value_mut().changer()
58      }
59      else
60      {
61        let context : Context = make!();
62        let id = context.id();
63        registry.contexts_with_name.insert( current_name.clone(), context.id() );
64        registry.contexts.insert( id, context );
65        registry.contexts.get_mut( &id ).unwrap().value_mut().changer()
66      }
67    }
68
69  }
70
71}
72
73crate::mod_interface!
74{
75
76  orphan use Registry;
77
78}
wplot/abs/registry.rs

wplot/abs/
registry.rs
