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#include <cstdlib>
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#include <wchar.h>
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#include <locale.h>
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#include <string>
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#include <jni.h>
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using namespace std;
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/**
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* Spouští JVM z C++, volá statickou metodu ze standardní knihovny (System.currentTimeMillis()) a main() metodu programu SQL-DK
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*
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* @param argc
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* @param argv
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* @return
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*/
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int main(int argc, char** argv) {
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setlocale(LC_ALL, "");
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JavaVM *jvm;
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JNIEnv *env;
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JavaVMOption options[1];
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char * home = getenv("HOME");
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string classPath;
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classPath.append("-Djava.class.path=");
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classPath.append(home);
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classPath.append("/projekty/SQL-DK/sql-dk/java/sql-dk/dist/sql-dk.jar");
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classPath.append(":");
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classPath.append(home);
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classPath.append("/projekty/SQL-DK/sql-dk/java/jdbc-loopback-driver/dist/jdbc-loopback-driver.jar");
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wprintf(L"classPath: %s\n", classPath.c_str());
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options[0].optionString = new char[classPath.length() + 1];
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copy(classPath.begin(), classPath.end(), options[0].optionString);
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JavaVMInitArgs vm_args;
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vm_args.version = JNI_VERSION_1_8;
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vm_args.nOptions = 1;
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vm_args.options = options;
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vm_args.ignoreUnrecognized = false;
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JNI_CreateJavaVM(&jvm, (void**) &env, &vm_args);
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string className = "java/lang/System";
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jclass cls = env->FindClass(className.c_str());
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if (cls) {
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string methodName = "currentTimeMillis";
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jmethodID mid = env->GetStaticMethodID(cls, methodName.c_str(), "()J");
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if (mid) {
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jlong time = env->CallStaticLongMethod(cls, mid);
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wprintf(L"Aktuální čas Javy: %d\n", time);
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} else {
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wprintf(L"Metoda nebyla nalezena: %s\n", methodName.c_str());
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}
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} else {
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wprintf(L"Třída nebyla nalezena: %s\n", className.c_str());
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}
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delete cls; // TODO: jak čistit?
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className = "info/globalcode/sql/dk/CLIStarter";
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cls = env->FindClass(className.c_str());
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if (cls) {
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string methodName = "main";
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jmethodID mid = env->GetStaticMethodID(cls, methodName.c_str(), "([Ljava/lang/String;)V");
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if (mid) {
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//jstring arg = env->NewStringUTF("--list-databases");
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//jarray args = env->NewObjectArray(1, env->FindClass("java/lang/String"), arg);
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jobjectArray args = env->NewObjectArray(10, env->FindClass("java/lang/String"), NULL);
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int a = 0;
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("--db"));
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("loopback"));
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//env->SetObjectArrayElement(args, a++, env->NewStringUTF("--sql-in")); // vyžaduje (libovolná) data na standardním vstupu
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("--sql"));
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("…"));
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("--data"));
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("2"));
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("a"));
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("b"));
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("c"));
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env->SetObjectArrayElement(args, a++, env->NewStringUTF("d"));
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for (int i = 0; i < 10; i++) {
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env->CallStaticVoidMethod(cls, mid, args);
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// FIXME: nefuguje – JVM ukončí proces → vlákna/procesy
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}
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} else {
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wprintf(L"Metoda nebyla nalezena: %s\n", methodName.c_str());
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}
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} else {
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wprintf(L"Třída nebyla nalezena: %s\n", className.c_str());
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}
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jvm->DestroyJavaVM();
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return 0;
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}
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