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_r260258624
########## 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) { Review comment: Same here ---------------------------------------------------------------- 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
