arpadboda commented on a change in pull request #489: MINIFICPP-740: Add ability to run NiFi processors from Java and Python URL: https://github.com/apache/nifi-minifi-cpp/pull/489#discussion_r260219135
########## File path: extensions/jni/jvm/JniMethod.h ########## @@ -0,0 +1,131 @@ +/** + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#ifndef EXTENSIONS_JNI_JVM_JNIMETHOD_H_ +#define EXTENSIONS_JNI_JVM_JNIMETHOD_H_ + +#include <string> +#include <vector> +#include <sstream> +#include <iterator> +#include <algorithm> +#include <jni.h> + +namespace org { +namespace apache { +namespace nifi { +namespace minifi { +namespace jni { + +/** + * Purpose and Justification: Represents a java method signature. Is used + * to contain the method signatures in internal objects. + */ +class JavaMethodSignature { + + public: + JavaMethodSignature(const JavaMethodSignature &other) = delete; + JavaMethodSignature(JavaMethodSignature &&other) = default; + JavaMethodSignature(const std::string &name, const std::string ¶ms, void *ptr) + : name_(name), + params_(params), + ptr_(ptr) { + } + + /** + * Returns the method name. + * Const cast here to clean up the caller's interface ( and java would force the loss of const ) + */ + const char *getName() const{ + return name_.c_str(); + } + + /** + * Returns the parameters. + * Const cast here to clean up the caller's interface ( and java would force the loss of const ) + */ + const char *getParameters() const { + return params_.c_str(); + } + + /** + * Returns the function pointer. can't be const. + */ + const void *getPointer() const { + return ptr_; + } + + JavaMethodSignature &operator=(const JavaMethodSignature &other) = delete; + JavaMethodSignature &operator=(JavaMethodSignature &&other) = default; + + private: + + std::string name_; + std::string params_; + void *ptr_; +}; + +/** + * Class to keep a list of signatures + */ +class JavaSignatures { + public: + JavaSignatures() + : method_ptr_(nullptr), + size_(0) { + } + void addSignature(JavaMethodSignature &&signature) { + methods_.emplace_back(std::move(signature)); + } + + bool empty() { + return methods_.empty() && size_ == 0; + } + + JNINativeMethod *getSignatures() { + std::lock_guard<std::mutex> lock(mutex_); + if (method_ptr_ == nullptr || size_ != methods_.size()) { + method_ptr_ = std::unique_ptr<JNINativeMethod>(new JNINativeMethod[methods_.size()]); + size_ = methods_.size(); + int i = 0; + for (auto &mthd : methods_) { + method_ptr_.get()[i].fnPtr = const_cast<void*>(mthd.getPointer()); Review comment: unique_ptr provides index operator to index the underlying array, no need to call "get()" ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
