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jni.c
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jni.c
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#include "de_ii_xtraplatform_cli_Cli.h"
#include "client.h"
#include "libxtracfg.h"
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
JavaVM *javaVM;
JNIEnv* jniEnv;
jobject handler;
jobject tracker;
jmethodID methodId;
progress_func progress_cb2;
// called from go, calls exec with command
// saves go progress callback, used in Java_de_ii_xtraplatform_cli_Cli_00024NativeProgress_update
const char* handle_command_2(handle_command_func handle_command_cb, const char* command, progress_func progress_cb) {
progress_cb2 = progress_cb;
return handle_command_cb(command);
}
// callback indirectly called from go with the command
// calls the java CommandHandler and returns the result to go
const char* exec(const char* command) {
//printf("JNI Command: %s\n", command);
jint res = (*javaVM)->AttachCurrentThread(javaVM, (void**)&jniEnv, NULL);
if (JNI_OK != res) {
printf("JNI no thread");
return NULL;
}
jstring command2 = (*jniEnv)->NewStringUTF(jniEnv, command);
jstring result2 = (jstring)(*jniEnv)->CallObjectMethod(jniEnv, handler, methodId, command2, tracker);
(*jniEnv)->DeleteLocalRef(jniEnv, command2);
const char* result = (*jniEnv)->GetStringUTFChars(jniEnv, result2, NULL);
res = (*javaVM)->DetachCurrentThread(javaVM);
if (JNI_OK != res) {
printf("JNI no thread end");
return NULL;
}
//printf("JNI Result: %s\n", result);
return result;
}
// entrypoint, called from java
JNIEXPORT void JNICALL Java_de_ii_xtraplatform_cli_Cli_execute
(JNIEnv* jni, jclass thisObject, jobject commandHandler, jobject progress) {
jint res = (*jni)->GetJavaVM(jni, &javaVM);
if (JNI_OK != res) {
printf("JNI no vm");
return;
}
jniEnv = jni;
handler = (*jni)->NewGlobalRef(jni, commandHandler);
tracker = (*jni)->NewGlobalRef(jni, progress);
// Find and save the id of the Java method to be called
jclass commandHandlerClass = (*jni)->GetObjectClass(jni, commandHandler);
methodId = (*jni)->GetMethodID(jni, commandHandlerClass, "handleCommand", "(Ljava/lang/String;Lde/ii/xtraplatform/cli/Progress;)Ljava/lang/String;");
handle_command_func hc = &exec;
// switch to go, pass exec above as callback
cmd_execute(hc);
(*jni)->DeleteGlobalRef(jni, handler);
(*jni)->DeleteGlobalRef(jni, tracker);
}
// called from java with progress, pass to go callback
JNIEXPORT void JNICALL Java_de_ii_xtraplatform_cli_Cli_00024NativeProgress_update
(JNIEnv *, jobject, jstring update) {
const char* msg = (*jniEnv)->GetStringUTFChars(jniEnv, update, NULL);
progress_cb2(msg);
}