[−][src]Struct jni_glue::Local
A Local, non-null, reference to a Java object (+ &Env) limited to the current thread/stack.
Including the env allows for the convenient execution of methods without having to individually pass the env as an
argument to each and every one. Since this is limited to the current thread/stack, these cannot be sanely stored
in any kind of static storage, nor shared between threads - instead use a Global
if you need to do either.
Will DeleteLocalRef when dropped, invalidating the jobject but ensuring threads that rarely or never return to Java may run without being guaranteed to eventually exhaust their local reference limit. If this is not desired, convert to a plain Ref with:
let local = Local::leak(local);
Not FFI Safe: #[repr(rust)], and exactly layout is likely to change depending on exact features used in the future. Specifically, on Android, since we're guaranteed to only have a single ambient VM, we can likely store the *const JNIEnv in thread local storage instead of lugging it around in every Local. Of course, there's no guarantee that's actually an optimization...
Methods
impl<'env, Class: AsValidJObjectAndEnv> Local<'env, Class>
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pub unsafe fn from_env_object(env: *const JNIEnv, object: jobject) -> Self
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pub fn leak(local: Self) -> Ref<'env, Class>
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Trait Implementations
impl<'env, Class: AsValidJObjectAndEnv> Drop for Local<'env, Class>
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impl<'env, Class: AsValidJObjectAndEnv> Deref for Local<'env, Class>
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Auto Trait Implementations
impl<'env, Class> !Sync for Local<'env, Class>
impl<'env, Class> Unpin for Local<'env, Class>
impl<'env, Class> !Send for Local<'env, Class>
impl<'env, Class> UnwindSafe for Local<'env, Class> where
Class: RefUnwindSafe,
Class: RefUnwindSafe,
impl<'env, Class> RefUnwindSafe for Local<'env, Class> where
Class: RefUnwindSafe,
Class: RefUnwindSafe,
Blanket Implementations
impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,