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use core::time::Duration;
use jni::errors::Result;
use jni::objects::{JObject, JString};
use jni::strings::JavaStr;
use jni::sys::{jbooleanArray, jdouble, jdoubleArray, jint, jlong};
use jni::JNIEnv;
use ordered_float::NotNan;
use rtlola_frontend::ParserConfig;
use rtlola_interpreter::{EvalConfig, Incremental, Monitor, TimeFormat, TimeRepresentation, Value};
use std::ffi::CStr;
pub struct KotlinMonitor {
monitor: Monitor<Incremental>,
relevant_ixs: Vec<usize>,
num_inputs: usize,
}
#[no_mangle]
pub extern "C" fn init(
env: JNIEnv,
_: JObject,
spec: JString,
relevant_outputs: JString,
) -> *const KotlinMonitor {
let spec = unsafe { convert_java_str(env.get_string(spec).unwrap()) };
let relevant_outputs = unsafe { convert_java_str(env.get_string(relevant_outputs).unwrap()) };
let ir = rtlola_frontend::parse(ParserConfig::for_string(spec)).unwrap();
let ec = EvalConfig::api(TimeRepresentation::Relative(TimeFormat::HumanTime));
let relevant_ixs = relevant_outputs
.split(',')
.map(|name| {
ir.outputs
.iter()
.find(|o| o.name == name)
.expect("ir does not contain required output stream")
.reference
.out_ix()
})
.collect();
let num_inputs = ir.inputs.len();
let m: Monitor<Incremental> = rtlola_interpreter::Config::new_api(ec, ir).as_api();
let monitor = KotlinMonitor {
monitor: m,
relevant_ixs,
num_inputs,
};
Box::into_raw(Box::new(monitor))
}
#[no_mangle]
pub extern "C" fn receive_single_value(
env: JNIEnv,
_: JObject,
monitor: jlong,
input_ix: jint,
value: jdouble,
timestamp: jdouble,
) -> jdoubleArray {
let mut mon = unsafe { Box::from_raw(monitor as *mut KotlinMonitor) };
let mut event = vec![Value::None; mon.num_inputs];
event[input_ix as usize] = value_from_f64(value);
process_event(env, &mut mon, &event, timestamp)
}
#[no_mangle]
pub extern "C" fn receive_total_event(
env: JNIEnv,
_: JObject,
monitor: jlong,
inputs: jdoubleArray,
) -> jdoubleArray {
let mut mon = unsafe { Box::from_raw(monitor as *mut KotlinMonitor) };
let num_values = mon.num_inputs + 1;
let inputs = get_floats(env, inputs, num_values);
debug_assert!(inputs.is_ok());
if inputs.is_err() {
return env.new_double_array(0).unwrap();
}
let inputs = inputs.unwrap();
let (time, inputs) = inputs.split_last().unwrap();
let inputs = inputs
.iter()
.copied()
.map(value_from_f64)
.collect::<Vec<_>>();
process_event(env, &mut mon, &inputs, *time)
}
#[no_mangle]
pub extern "C" fn receive_partial_event(
env: JNIEnv,
_: JObject,
monitor: jlong,
inputs: jdoubleArray,
active: jbooleanArray,
) -> jdoubleArray {
let mut mon = unsafe { Box::from_raw(monitor as *mut KotlinMonitor) };
let num_values = mon.num_inputs + 1;
let inputs = get_floats(env, inputs, num_values);
let active = get_bools(env, active, num_values);
debug_assert!(inputs.is_ok());
debug_assert!(active.is_ok());
if active.is_err() || inputs.is_err() {
return env.new_double_array(0).unwrap();
}
let inputs = inputs.unwrap();
let (time, input) = inputs.split_last().unwrap();
let active = active.unwrap();
let event: Vec<Value> = input
.iter()
.zip(active)
.map(|(f, a)| if a { value_from_f64(*f) } else { Value::None })
.collect();
process_event(env, &mut mon, &event, *time)
}
fn get_floats(env: JNIEnv, inputs: jdoubleArray, num_values: usize) -> Result<Vec<f64>> {
let mut event = vec![0.0; num_values];
env.get_double_array_region(inputs, 0, &mut event)?;
Ok(event)
}
fn get_bools(
env: JNIEnv,
inputs: jdoubleArray,
num_values: usize,
) -> Result<impl Iterator<Item = bool>> {
let mut values = vec![0u8; num_values];
env.get_boolean_array_region(inputs, 0, &mut values)?;
Ok(values.into_iter().map(|v| v != 0))
}
fn process_event(env: JNIEnv, mon: &mut KotlinMonitor, event: &[Value], time: f64) -> jdoubleArray {
let updates = mon
.monitor
.accept_event(event, Duration::new(time.floor() as u64, 0));
let num_updates = updates.timed.len();
let res = env
.new_double_array((num_updates * mon.relevant_ixs.len()) as i32)
.unwrap();
let output_copy_res: jni::errors::Result<()> =
updates
.timed
.iter()
.enumerate()
.try_for_each(|(ix, update)| {
let (_, values) = update;
let output: Vec<jdouble> = values
.iter()
.filter(|(sr, _v)| mon.relevant_ixs.contains(sr))
.map(|(_sr, v)| {
if let Value::Float(f) = v {
f.into_inner()
} else {
0f64
}
})
.collect();
env.set_double_array_region(res, (mon.relevant_ixs.len() * ix) as i32, &output)
});
debug_assert!(output_copy_res.is_ok());
res
}
fn value_from_f64(v: f64) -> Value {
Value::Float(NotNan::new(v).unwrap())
}
unsafe fn convert_java_str(js: JavaStr) -> String {
let raw = CStr::from_ptr(js.as_ptr());
String::from(raw.to_str().unwrap())
}