CppPlugins/src/main/cpp/src/libplugin.cpp

#include "de_mrbesen_cppplugins_CppPlugin.h"
#include "de_mrbesen_cppplugins_CppPlugin_CppListener.h"

#include <iostream>
#include <dlfcn.h> //dynamic linking

#include <thread> //thread id

#include "libplugin.h"
#include "plugin.h"

jclass CPPPLUGINCLASS;
jclass EVENTCLASS;
jclass MAPCLASS;
jclass LISTENERCLASS;
jfieldID EVENTDATAF;
jfieldID EVENTNAMEF;
jmethodID MAPGET;
jmethodID MAPPUT;
jmethodID LISTENERCONTR;
jmethodID LISTENERSMALLCONTR;

CppPlugin* plugin; //what happens, with more than one plugin?

/*
jint JNI_OnLoad(JavaVM *vm, void *reserved) {
	DEB("onload" );
	JNIEnv* env;
	vm->GetEnv((void**) &env, JNI_VERSION_1_8);


	return JNI_VERSION_1_8;
}*/

void fixcap(JNIEnv* env) {
	DEB("ensure 1024" );
	env->EnsureLocalCapacity(1024);

	DEB("push frame 1024" );
	env->PushLocalFrame(1024);

}
/*
operator long()(JNIDATA d) {
	return (long) d;
}

long operator|(JNIDATA a, JNIDATA b) {
	return (long) a | (long) b;
}

long operator|(long a, JNIDATA b) {
	return a | (long) b;
}

long operator&(long a, JNIDATA b) {
	return a & (long) b;
}*/

void load(JNIEnv* env, long data) {

	DEB("loading with mask: " << data);


	if(data & JNI_PLUGINCLASS)
		CPPPLUGINCLASS = env->FindClass("de/mrbesen/cppplugins/CppPlugin");
	if(data & JNI_EVENTCLASS)
		EVENTCLASS = env->FindClass("de/mrbesen/cppplugins/CppEvent");
	if(data & JNI_MAPCLASS)
		MAPCLASS = env->FindClass("java/util/Map");
	if(data & JNI_LISTENERCLASS)
		LISTENERCLASS = env->FindClass("de/mrbesen/cppplugins/CppPlugin$CppListener");

	DEB("find classes: " << (!!CPPPLUGINCLASS) << (!!EVENTCLASS) << (!!MAPCLASS) << (!!LISTENERCLASS));

	if(data & JNI_EVENTDATAFIELD)
		EVENTDATAF = env->GetFieldID(EVENTCLASS, "data", "Ljava/util/Map;");
	if(data & JNI_EVENTNAMEFIELD)
		EVENTNAMEF = env->GetFieldID(EVENTCLASS, "name", "Ljava/lang/String;");

	DEB("findfields: " << (!!EVENTDATAF) << (!!EVENTNAMEF));

	if(data & JNI_MAPGETMETH)
		MAPGET = env->GetMethodID(MAPCLASS, "get", "(Ljava/lang/Object;)Ljava/lang/Object;");
	if(data & JNI_MAPPUTMETH)
		MAPPUT = env->GetMethodID(MAPCLASS, "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
	if(data & JNI_LISTENERCONSTR)
		LISTENERCONTR = env->GetMethodID(LISTENERCLASS, "<init>", "(Ljava/lang/String;J)V");
	if(data & JNI_LISTENERSMALLCONSTR)
		LISTENERSMALLCONTR = env->GetMethodID(LISTENERCLASS, "<init>", "()V");

	DEB("find methods: " << (!!MAPGET) << (!!MAPPUT) << (!!LISTENERCONTR) << (!!LISTENERSMALLCONTR));
}

JNIEXPORT jboolean JNICALL Java_de_mrbesen_cppplugins_CppPlugin_init_1(JNIEnv* env, jobject thisobj) {
	load(env, JNI_ALL);
	return true;
}


/**
 * Class:     de_mrbesen_cppplugins_CppPlugin
 * Method:    loadPlugin
 * Signature: (Ljava/lang/String;)Z
 */
JNIEXPORT jboolean JNICALL Java_de_mrbesen_cppplugins_CppPlugin_loadPlugin(JNIEnv* env, jobject thisobj, jstring path) {
	const char* cpath = env->GetStringUTFChars(path, 0);

	//open plugin
	DEB("open plugin " << cpath );
	void* handle = dlopen(cpath, RTLD_LAZY);
	if (!handle) {
		std::cout << "could not create handle of: " << cpath << " error: " << dlerror() << std::endl;
		return false;
	}
		//throw std::string("Error: plugin could not be opend. ") + dlerror();

	//load function pointer
	initfptr initf = (initfptr) dlsym(handle, "init");
	if(!initf) {
		std::cout << "Could not find function init: " << dlerror() << std::endl;
		dlclose(handle);
		return false;
	}

	plugin = initf();
	plugin->handle = handle;
	
	//store data
	//setData(data, env, thisobj);
	DEB("plugin: " << (bool)plugin);
	return (bool) plugin; // converted to boolean here
}

/*
 * Class:     de_mrbesen_cppplugins_CppPlugin
 * Method:    onLoad
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_de_mrbesen_cppplugins_CppPlugin_onLoad(JNIEnv* env, jobject thisobj) {
	//TODO
	DEB("lib::onLoad()");
	plugin->onLoad();
}

/*
 * Class:     de_mrbesen_cppplugins_CppPlugin
 * Method:    onEnable_
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_de_mrbesen_cppplugins_CppPlugin_onEnable_1(JNIEnv* env, jobject thisobj) {
	//TODO
	DEB("lib::onEnable()");
	plugin->onEnable();
}

/*
 * Class:     de_mrbesen_cppplugins_CppPlugin
 * Method:    onDisable_
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_de_mrbesen_cppplugins_CppPlugin_onDisable_1(JNIEnv* env, jobject thisobj) {
	//TODO
	DEB("lib::onDisable()" );
	plugin->onDisable();
	dlclose(plugin->handle);
}

/*
 * Class:     de_mrbesen_cppplugins_CppPlugin
 * Method:    fireEvent
 * Signature: (Lde/mrbesen/cppplugins/CppEvent;I)Lde/mrbesen/cppplugins/CppEvent;
 */
JNIEXPORT jobject JNICALL Java_de_mrbesen_cppplugins_CppPlugin_fireEvent(JNIEnv* env, jobject thisobj, jobject jevent, jlong functionid) {
	DEB("lib::fireEvent()" );
	if(functionid == 0) {
		DEB("invalid function id");
		return jevent;
	}

	load(env, JNI_EVENT | JNI_MAP);

	//cast function
	eventfptr f = reinterpret_cast<eventfptr>(functionid);

	//cast event
	Event event(env, jevent);

	//call it
	f(plugin, &event);

	//put changed fields back in the jevent
	event.reapply(env, jevent);

	return jevent;
}

/*
 * Class:     de_mrbesen_cppplugins_CppPlugin
 * Method:    onCmd
 * Signature: (Lorg/bukkit/command/CommandSender;Lorg/bukkit/command/Command;Ljava/lang/String;[Ljava/lang/String;)Z
 */
JNIEXPORT jboolean JNICALL Java_de_mrbesen_cppplugins_CppPlugin_onCmd(JNIEnv* env, jobject thisobj, jobject sender, jobject cmd, jstring label, jobjectArray args) {
	//TODO
	return false;
}

/*
 * Class:     de_mrbesen_cppplugins_CppPlugin
 * Method:    getListener
 * Signature: ()[Lde/mrbesen/cppplugins/CppPlugin/CppListener;
 */
JNIEXPORT jobjectArray JNICALL Java_de_mrbesen_cppplugins_CppPlugin_getListener(JNIEnv* env, jobject thisobj) {
	load(env, JNI_LISTENER);

	//call getEvents
	std::map<std::string, eventfptr> events = plugin->getEvents();
	DEB("found " << events.size() << " Events");

	//create array
	jobject initial = env->NewObject(LISTENERCLASS, LISTENERSMALLCONTR);
	jobjectArray arr = env->NewObjectArray(events.size(), LISTENERCLASS, initial);

	DEB("populate array");
	//populate array
	int i = 0;
	for(auto it : events) {
		//create object
		jstring eventname = env->NewStringUTF(it.first.c_str());
		jobject listener = env->NewObject(LISTENERCLASS, LISTENERCONTR, eventname, it.second);
		env->DeleteLocalRef(eventname);

		//set array
		env->SetObjectArrayElement(arr, i++, listener);
	}

	DEB("Array finished");

	return arr;
}