jvm 0.3.0

Core abstractions and runtime services for embeddable JVM implementations
Documentation 
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use alloc::{boxed::Box, collections::BTreeMap, sync::Arc};
use core::{ops::Deref, sync::atomic::AtomicU64};

use parking_lot::RwLock;

use crate::{AsClassInstance, ClassInstance, ClassInstanceRef};

pub(crate) struct GlobalReferences {
    pub(crate) next_id: AtomicU64,
    pub(crate) objects: RwLock<BTreeMap<u64, Box<dyn ClassInstance>>>,
}

pub struct GlobalRef<T> {
    pub(crate) references: Arc<GlobalReferences>,
    pub(crate) id: u64,
    pub(crate) reference: ClassInstanceRef<T>,
}

impl<T> Deref for GlobalRef<T> {
    type Target = ClassInstanceRef<T>;

    fn deref(&self) -> &Self::Target {
        &self.reference
    }
}

impl<T> AsClassInstance for GlobalRef<T> {
    fn as_class_instance(&self) -> &dyn ClassInstance {
        self.reference.as_class_instance()
    }
}

impl<T> Drop for GlobalRef<T> {
    fn drop(&mut self) {
        self.references.objects.write().remove(&self.id);
    }
}