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_r260260267
########## File path: extensions/jni/jvm/JniProcessSession.cpp ########## @@ -0,0 +1,467 @@ +/** + * + * 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. + */ + +#include "JniProcessSession.h" + +#include <string> +#include <memory> +#include <algorithm> +#include <iterator> +#include <set> +#include "core/Property.h" +#include "io/validation.h" +#include "utils/StringUtils.h" +#include "utils/file/FileUtils.h" +#include "properties/Configure.h" +#include "JVMLoader.h" +#include "JniReferenceObjects.h" + +#include "core/Processor.h" +#include "JniFlowFile.h" +#include "../JavaException.h" + +#ifdef __cplusplus +extern "C" { +#endif + +jobject Java_org_apache_nifi_processor_JniProcessSession_create(JNIEnv *env, jobject obj) { + if (obj == nullptr) { + return nullptr; + } + minifi::jni::JniSession *session = minifi::jni::JVMLoader::getPtr<minifi::jni::JniSession>(env, obj); + + auto ff = minifi::jni::JVMLoader::getInstance()->load_class("org/apache/nifi/processor/JniFlowFile", env); + + auto ff_instance = ff.newInstance(env); + + minifi::jni::ThrowIf(env); + + auto flow_file = session->getSession()->create(); + + auto flow = std::make_shared<minifi::jni::JniFlowFile>(flow_file, session->getServicer(), ff_instance); + + flow_file->addReference(flow); + + auto rawFlow = session->addFlowFile(flow); + + minifi::jni::JVMLoader::getInstance()->setReference(ff_instance, env, rawFlow); + + return ff_instance; + +} + +jobject Java_org_apache_nifi_processor_JniProcessSession_readFlowFile(JNIEnv *env, jobject obj, jobject ff) { + if (obj == nullptr || ff == nullptr) { + minifi::jni::ThrowJava(env, "No flowfile to read"); + return nullptr; + } + minifi::jni::JniSession *session = minifi::jni::JVMLoader::getPtr<minifi::jni::JniSession>(env, obj); + minifi::jni::JniFlowFile *ptr = minifi::jni::JVMLoader::getInstance()->getReference<minifi::jni::JniFlowFile>(env,ff); + if (ptr->get()) { + + auto jincls = minifi::jni::JVMLoader::getInstance()->load_class("org/apache/nifi/processor/JniInputStream", env); + + auto jin = jincls.newInstance(env); + + minifi::jni::ThrowIf(env); + + std::unique_ptr<minifi::jni::JniByteInputStream> callback = std::unique_ptr<minifi::jni::JniByteInputStream>(new minifi::jni::JniByteInputStream(4096)); + + session->getSession()->read(ptr->get(), callback.get()); + + auto jniInpuStream = std::make_shared<minifi::jni::JniInputStream>(std::move(callback), jin, session->getServicer()); + + session->addInputStream(jniInpuStream); + + minifi::jni::JVMLoader::getInstance()->setReference(jin, env, jniInpuStream.get()); + + return jin; + } + + return nullptr; + +} + +jint Java_org_apache_nifi_processor_JniInputStream_read(JNIEnv *env, jobject obj) { + minifi::jni::JniInputStream *jin = minifi::jni::JVMLoader::getPtr<minifi::jni::JniInputStream>(env, obj); + if (obj == nullptr) { + minifi::jni::ThrowJava(env, "No InputStream to read"); + return -1; + } + char value = 0; + if (jin->read(value) > 0) + return value; + else + return -1; +} + +jint Java_org_apache_nifi_processor_JniInputStream_readWithOffset(JNIEnv *env, jobject obj, jbyteArray arr, jint offset, jint length) { + minifi::jni::JniInputStream *jin = minifi::jni::JVMLoader::getPtr<minifi::jni::JniInputStream>(env, obj); + if (obj == nullptr) { + minifi::jni::ThrowJava(env, "No InputStream to read"); + return -1; + } + return jin->read(env, arr, (int) offset, (int) length); +} + +jboolean Java_org_apache_nifi_processor_JniProcessSession_write(JNIEnv *env, jobject obj, jobject ff, jbyteArray byteArray) { + if (obj == nullptr || ff == nullptr || byteArray == nullptr) { + minifi::jni::ThrowJava(env, "No flowfile to write"); + return false; + } + + minifi::jni::JniSession *session = minifi::jni::JVMLoader::getPtr<minifi::jni::JniSession>(env, obj); + minifi::jni::JniFlowFile *ptr = minifi::jni::JVMLoader::getInstance()->getReference<minifi::jni::JniFlowFile>(env,ff); + + if (ptr->get()) { + jbyte* buffer = env->GetByteArrayElements(byteArray, 0); + jsize length = env->GetArrayLength(byteArray); + + minifi::jni::JniByteOutStream outStream(buffer, (size_t) length); + session->getSession()->write(ptr->get(), &outStream); + + env->ReleaseByteArrayElements(byteArray, buffer, 0); + // finished + + return true; + } + + return false; + +} + +jobject Java_org_apache_nifi_processor_JniProcessSession_clone(JNIEnv *env, jobject obj, jobject prevff) { + if (obj == nullptr || prevff == nullptr) { + minifi::jni::ThrowJava(env, "No flowfile to clone"); + return nullptr; + } + minifi::jni::JniSession *session = minifi::jni::JVMLoader::getPtr<minifi::jni::JniSession>(env, obj); + minifi::jni::JniFlowFile *ptr = minifi::jni::JVMLoader::getInstance()->getReference<minifi::jni::JniFlowFile>(env,prevff); + + if (ptr->get()) { + auto ff = minifi::jni::JVMLoader::getInstance()->load_class("org/apache/nifi/processor/JniFlowFile", env); + + auto ff_instance = ff.newInstance(env); + + minifi::jni::ThrowIf(env); + + //session->global_ff_objects_.push_back(ff_instance); + + auto flow_file = session->getSession()->clone(ptr->get()); + + auto flow = std::make_shared<minifi::jni::JniFlowFile>(flow_file, session->getServicer(), ff_instance); + + flow_file->addReference(flow); + + auto rawFlow = session->addFlowFile(flow); + + minifi::jni::JVMLoader::getInstance()->setReference(ff_instance, env, rawFlow); + + return ff_instance; + } + + return nullptr; + +} + +jobject Java_org_apache_nifi_processor_JniProcessSession_get(JNIEnv *env, jobject obj) { + if (obj == nullptr) + return nullptr; + + minifi::jni::JniSession *session = minifi::jni::JVMLoader::getPtr<minifi::jni::JniSession>(env, obj); + + if (session == nullptr) + return nullptr; + + auto flow_file = session->getSession()->get(); + + auto prevFF = session->getFlowFileReference(flow_file); + if (prevFF != nullptr) { + return prevFF->getJniReference(); + } + + // otherwise create one + auto ff = minifi::jni::JVMLoader::getInstance()->load_class("org/apache/nifi/processor/JniFlowFile"); + + auto ff_instance = ff.newInstance(env); + + if (flow_file == nullptr || ff_instance == nullptr) { + // this is an acceptable condition. + return nullptr; + } + + auto flow = std::make_shared<minifi::jni::JniFlowFile>(flow_file, session->getServicer(), ff_instance); + + flow_file->addReference(flow); + + auto rawFlow = session->addFlowFile(flow); + + minifi::jni::JVMLoader::getInstance()->setReference(ff_instance, env, rawFlow); + + return ff_instance; +} + +jobject Java_org_apache_nifi_processor_JniProcessSession_putAttribute(JNIEnv *env, jobject obj, jobject ff, jstring key, jstring value) { + if (obj == nullptr || ff == nullptr) { + minifi::jni::ThrowJava(env, "No flowfile"); + return nullptr; + } + minifi::jni::JniSession *session = minifi::jni::JVMLoader::getPtr<minifi::jni::JniSession>(env, obj); + minifi::jni::JniFlowFile *ptr = minifi::jni::JVMLoader::getInstance()->getReference<minifi::jni::JniFlowFile>(env,ff); + + if (ff == nullptr || key == nullptr || value == nullptr) { + return nullptr; + } + + const char *kstr = env->GetStringUTFChars(key, 0); + const char *vstr = env->GetStringUTFChars(value, 0); + std::string valuestr = vstr; + std::string keystr = kstr; + + ptr->get()->addAttribute(keystr, valuestr); + env->ReleaseStringUTFChars(key, kstr); + env->ReleaseStringUTFChars(value, vstr); + return ff; + +} + +void Java_org_apache_nifi_processor_JniProcessSession_transfer(JNIEnv *env, jobject obj, jobject ff, jstring relationship) { + if (obj == nullptr || ff == nullptr) { + minifi::jni::ThrowJava(env, "No flowfile"); + return; + } + minifi::jni::JniSession *session = minifi::jni::JVMLoader::getPtr<minifi::jni::JniSession>(env, obj); + minifi::jni::JniFlowFile *ptr = minifi::jni::JVMLoader::getInstance()->getReference<minifi::jni::JniFlowFile>(env,ff); + const char *relstr = env->GetStringUTFChars(relationship, 0); + std::string relString = relstr; + core::Relationship success(relString, "description"); Review comment: Calling it success is a bit misleading in my opinion. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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