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Use a CompletableFuture instead of blocking the JVM thread.

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Kavin 2023-06-30 13:45:14 +01:00
parent 75cfd8dadd
commit eb46230403
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2 changed files with 64 additions and 44 deletions
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103
reqwest-jni/src/lib.rs
View file

@ -60,48 +60,67 @@ pub extern "system" fn Java_rocks_kavin_reqwest4j_ReqwestUtils_fetch(
request.body(body)
};
// send request
let response = RUNTIME.block_on(async {
request.send().await
// `JNIEnv` cannot be sent between threads safely
let jvm = env.get_java_vm().unwrap();
// create CompletableFuture
let _future = env.new_object("java/util/concurrent/CompletableFuture", "()V", &[]).unwrap();
let future = env.new_global_ref(&_future).unwrap();
RUNTIME.spawn_blocking(move || {
// send request
let response = RUNTIME.block_on(async {
request.send().await
});
let mut env = jvm.attach_current_thread().unwrap();
if let Err(error) = response {
let error = error.to_string();
let error = env.new_string(error).unwrap();
// create Exception
let exception = env.new_object("java/lang/Exception", "(Ljava/lang/String;)V", &[
(&error).into(),
]).unwrap();
// pass error to CompletableFuture
env.call_method(future, "completeExceptionally", "(Ljava/lang/Throwable;)Z", &[(&exception).into()]).unwrap();
return ();
}
let response = response.unwrap();
// get response
let status = response.status().as_u16() as i32;
let headers = env.new_object("java/util/HashMap", "()V", &[]).unwrap();
let headers: JMap = JMap::from_env(&mut env, &headers).unwrap();
response.headers().iter().for_each(|(key, value)| {
let key = env.new_string(key.as_str()).unwrap();
let value = env.new_string(value.to_str().unwrap()).unwrap();
headers.put(&mut env, &JObject::from(key), &JObject::from(value)).unwrap();
});
let final_url = response.url().to_string();
let final_url = env.new_string(final_url).unwrap();
let body = RUNTIME.block_on(async {
response.bytes().await.unwrap_or_default().to_vec()
});
let body = env.byte_array_from_slice(&body).unwrap();
// return response to CompletableFuture
let response = env.new_object("rocks/kavin/reqwest4j/Response", "(ILjava/util/Map;[BLjava/lang/String;)V", &[
status.into(),
(&headers).into(),
(&body).into(),
(&final_url).into(),
]).unwrap();
let future = future.as_obj();
env.call_method(future, "complete", "(Ljava/lang/Object;)Z", &[(&response).into()]).unwrap();
});
if let Err(error) = response {
let error = error.to_string();
env.throw_new("java/lang/RuntimeException", error).unwrap();
return JObject::null().into_raw();
}
let response = response.unwrap();
// get response
let status = response.status().as_u16() as i32;
let headers = env.new_object("java/util/HashMap", "()V", &[]).unwrap();
let headers: JMap = JMap::from_env(&mut env, &headers).unwrap();
response.headers().iter().for_each(|(key, value)| {
let key = env.new_string(key.as_str()).unwrap();
let value = env.new_string(value.to_str().unwrap()).unwrap();
headers.put(&mut env, &JObject::from(key), &JObject::from(value)).unwrap();
});
let final_url = response.url().to_string();
let final_url = env.new_string(final_url).unwrap();
let body = RUNTIME.block_on(async {
response.bytes().await.unwrap_or_default().to_vec()
});
let body = env.byte_array_from_slice(&body).unwrap();
// return response
let response = env.new_object("rocks/kavin/reqwest4j/Response", "(ILjava/util/Map;[BLjava/lang/String;)V", &[
status.into(),
(&headers).into(),
(&body).into(),
(&final_url).into(),
]).unwrap();
response.into_raw()
return _future.into_raw();
}

5
src/main/java/rocks/kavin/reqwest4j/ReqwestUtils.java
View file

@ -4,6 +4,7 @@ import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
public class ReqwestUtils {
@ -34,7 +35,7 @@ public class ReqwestUtils {
System.load(nativeFile.getAbsolutePath());
}
public static native Response fetch(String url, String method, byte[] body,
Map<String, String> headers);
public static native CompletableFuture<Response> fetch(String url, String method, byte[] body,
Map<String, String> headers);
}