Comments (7)
Definitely want to see this. Something like:
#[jni("com.example.Foo")]
pub fn init(filename: &str) -> Result<(), Error> { ... }
#[jni("com.example.Bar")]
pub fn close_it(env: JNIEnv, filename: JString) -> Result<(), Error> { ... }
Becomes something like
#[no_mangle]
pub extern "system" fn Java_com_example_Bar_closeIt(env: JNIEnv, _: JClass, filename: JString) {
// [...]
}
- Name maker. Pass in java path and the name becomes java-y.
- Auto-conversion between Rust and Java types. Java types can still be expressed if you want to do it yourself.
catch_unwind
- Handle
Result
s and throw on error
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After playing around with some JNI bindings of my own and encountering similar pain points, I've just published jni_fn
which accomplishes at least the first item from @mehcode's comment:
- Name maker. Pass in java path and the name becomes java-y.
That seemed like the most well-defined problem to knock off the list, and was also my biggest confusion when starting out (where did this long auto-generated name come from and why do I need to care about it?).
I'm happy to explore incorporating the jni_fn
macro into jni
if there's interest!
I'm also open to adding in the other 3 items from that list, but I'd appreciate more design discussion; ideally examples of code before and after expansion. I've only just started investigating JNI and I'm sure I don't have a good mental model of the "edge cases" of JNI usage yet.
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A little older topic, but would the maintainers consider merging jni_fn
in this repository?
This branch works for scala projects also,
jni_fn = { git = "https://gitlab.com/antonok/jni_fn.git", branch = "scala-class-dollars" }
from jni-rs.
After playing around with some JNI bindings of my own and encountering similar pain points, I've just published
jni_fn
which accomplishes at least the first item from @mehcode's comment:
- Name maker. Pass in java path and the name becomes java-y.
...
I'm happy to explore incorporating the
jni_fn
macro intojni
if there's interest!
@antonok-edm That looks super useful! Will try it in our project soon. Thanks for sharing 🙏
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After having used a functionality pretty muchg exactly as @mehcode describes in Pyo3, this would be a great productivity boost. However it wouldn't be too difficult to simply create a proc_macro crate on top of jni to do this.
from jni-rs.
Agreed. Having to mix java's exceptions and rust's Result
enum, I'm confident the syntax proposed would look and feel so much better.
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This topic is pretty old, but maybe someone will find this useful: I created macros to handle exactly what is described here. It's inspired by magnus and it's WIP, no tests, no jni[_static]_method
implementation, poor Err
handling.
Also you may find this project useful, though I don't like the approach a bit and think PyO3's and Magnus' way is better.
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Related Issues (20)
- `get_env` should accept JNI version as a parameter, like the C JNI function `GetEnv` does
- pass rust function as implementation for Java object HOT 5
- JavaVM should be Clone HOT 1
- `get_static_field_unchecked` was not updated to use ReturnType in #344
- `{get,set}[_static]_field_unchecked` should be `unsafe`
- How to add elements into an `JObjectArray`? HOT 2
- `JNIStr` should implement `to_str()` and not `Deref` directly to a `CStr`
- How to pass JavaVM from c to rust HOT 2
- `JClass::from`, `JString::from`, `JThrowable::from`, etc. safety HOT 2
- Byte type confusion
- Feature request: JString from JChar slice via NewString
- How to return jobject as kotlin data class
- New release on crates.io
- Could not compile jni (build script) HOT 1
- JNIEnv::register_native_methods should be marked as unsafe
- JNIEnv::get_string should delete the local ref of string_class HOT 1
- Performance enhancement in get_string
- `new_object_unchecked` should accept`Desc<'local, JMethodID>`
- [Question]: How does one send a native rust function to java as a callback? HOT 2
- `JNIEnv::take_rust_field` seems meant for use with `java.lang.Object.finalize`, but that is deprecated
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