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use JNIEnv;
use errors::*;
use sys;
use std::ops::Deref;
use std::ptr;
#[cfg(feature = "invocation")]
use InitArgs;
pub struct JavaVM(*mut sys::JavaVM);
unsafe impl Send for JavaVM {}
unsafe impl Sync for JavaVM {}
impl JavaVM {
#[cfg(feature = "invocation")]
pub fn new(args: InitArgs) -> Result<Self> {
use std::os::raw::c_void;
let mut ptr: *mut sys::JavaVM = ::std::ptr::null_mut();
let mut env: *mut sys::JNIEnv = ::std::ptr::null_mut();
unsafe {
jni_error_code_to_result(sys::JNI_CreateJavaVM(
&mut ptr as *mut _,
&mut env as *mut *mut sys::JNIEnv as *mut *mut c_void,
args.inner_ptr(),
))?;
let vm = Self::from_raw(ptr)?;
java_vm_unchecked!(vm.0, DetachCurrentThread);
Ok(vm)
}
}
pub unsafe fn from_raw(ptr: *mut sys::JavaVM) -> Result<Self> {
non_null!(ptr, "from_raw ptr argument");
Ok(JavaVM(ptr))
}
pub fn attach_current_thread(&self) -> Result<AttachGuard> {
let mut ptr = ptr::null_mut();
unsafe {
let res = java_vm_unchecked!(self.0, AttachCurrentThread, &mut ptr, ptr::null_mut());
jni_error_code_to_result(res)?;
let env = JNIEnv::from_raw(ptr as *mut sys::JNIEnv)?;
Ok(AttachGuard {
java_vm: self,
env: env,
})
}
}
pub fn attach_current_thread_as_daemon(&self) -> Result<JNIEnv> {
let mut ptr = ptr::null_mut();
unsafe {
let res = java_vm_unchecked!(
self.0,
AttachCurrentThreadAsDaemon,
&mut ptr,
ptr::null_mut()
);
jni_error_code_to_result(res)?;
JNIEnv::from_raw(ptr as *mut sys::JNIEnv)
}
}
pub fn get_env(&self) -> Result<JNIEnv> {
let mut ptr = ptr::null_mut();
unsafe {
let res = java_vm_unchecked!(self.0, GetEnv, &mut ptr, sys::JNI_VERSION_1_1);
jni_error_code_to_result(res)?;
JNIEnv::from_raw(ptr as *mut sys::JNIEnv)
}
}
}
pub struct AttachGuard<'a> {
java_vm: &'a JavaVM,
env: JNIEnv<'a>,
}
impl<'a> AttachGuard<'a> {
fn detach(&mut self) -> Result<()> {
unsafe {
java_vm_unchecked!(self.java_vm.0, DetachCurrentThread);
}
Ok(())
}
}
impl<'a> Deref for AttachGuard<'a> {
type Target = JNIEnv<'a>;
fn deref(&self) -> &Self::Target {
&self.env
}
}
impl<'a> Drop for AttachGuard<'a> {
fn drop(&mut self) {
match self.detach() {
Ok(()) => (),
Err(e) => debug!("error detaching current thread: {:#?}", e),
}
}
}