MINIFICPP-2850 Finalize stable API before 1.0

[martinzink]

• removed MINIFI_NULL
• remove struct/enum typedefs, and added struct/enum where necessary
• CamelCase to snake_case (in minifi-api.h)
• onTrigger -> trigger, onSChedule -> schedule, onUnSchedule -> unschedule
• removed calculateMetrics from callbacks (replaced with minifi_process_context_report_metrics)
• removed getTriggerWhenEmpty from callbacks (replaced with minifi_process_context_set_trigger_when_empty)
• removed MinifiLoggerSetMaxLogSize (no replacement, we should reintroduce it if needed)
• removed MinifiLoggerLevel (no replacement, we should reintroduce if needed)
• removed c from API filenames (minifi-c-api.h -> minifi-api.h, minifi-c-api.def -> minifi-api.def etc.)
• renamed minifi_property_definition::type -> minifi_property_definition::allowed_type
• renamed class_properties_count -> properties_count, class_properties_ptr -> properties_ptr, class_relationships_ptr -> relationships_ptr etc
• we also debated removing stdbool.h since we target C23 (but I've found that caused some problems in the rust wrapper so better to leave it for now)

There is also a second commit which fixes a bug remove minifiSystemControllerServiceType
the resulting change can be seen in the .github/references/ubuntu_22_04_clang_arm_manifest.json

---

Thank you for submitting a contribution to Apache NiFi - MiNiFi C++.

In order to streamline the review of the contribution we ask you to ensure the following steps have been taken:

For all changes:

• Is there a JIRA ticket associated with this PR? Is it referenced in the commit message?

• Does your PR title start with MINIFICPP-XXXX where XXXX is the JIRA number you are trying to resolve? Pay particular attention to the hyphen "-" character.

• Has your PR been rebased against the latest commit within the target branch (typically main)?

• Is your initial contribution a single, squashed commit?

For code changes:

• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE file?
• If applicable, have you updated the NOTICE file?

For documentation related changes:

• Have you ensured that format looks appropriate for the output in which it is rendered?

Note:

Please ensure that once the PR is submitted, you check GitHub Actions CI results for build issues and submit an update to your PR as soon as possible.

[Copilot]

Pull request overview

This PR finalizes the “stable” MiNiFi C/C++ extension API surface in preparation for a 1.0 release by renaming and normalizing exported C symbols/headers, updating the C++ extension framework wrappers, and migrating extensions/tests to the new API (including new metrics reporting and trigger-when-empty control paths).

Changes:

• Renamed/normalized the C API (header/DEF exports/symbol names) and updated consumers across the codebase.
• Replaced the previous “calculateMetrics” callback path with minifi_process_context_report_metrics, and added minifi_process_context_set_trigger_when_empty.
• Updated extension loading/verification, documentation, and release packaging to use the new stable API artifacts.

Reviewed changes

Copilot reviewed 86 out of 86 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
minifi-api/minifi-c-api.def	Removed legacy Windows DEF export list (old symbol names).
minifi-api/minifi-api.def	Added new Windows DEF export list for the renamed stable API.
minifi-api/include/minifi-cpp/core/ProcessorApi.h	Added setTriggerWhenEmpty to the processor API interface.
minifi-api/include/minifi-cpp/core/ControllerServiceType.h	Removed minifiSystemControllerServiceType helper; tightened ctor explicitness.
minifi-api/include/minifi-c/minifi-c.h	Removed old C API header.
minifi-api/include/minifi-c/minifi-api.h	Added new stable C API header (snake_case structs/functions).
minifi-api/common/include/minifi-cpp/io/StreamCallback.h	Updated includes/types to the new C API names.
minifi-api/CMakeLists.txt	Updated Windows import-lib generation to use minifi-api.def.
libminifi/test/libtest/unit/ContentRepositoryDependentTests.h	Updated include to new stable C API header.
libminifi/test/integration/extension-verification-test/ExtensionVerificationTests.cpp	Updated extension init symbol names in tests.
libminifi/test/integration/extension-verification-test/CreateNotCalled.cpp	Updated test extension symbols/types to new API names.
libminifi/test/integration/extension-verification-test/CppApiExtension.cpp	Updated C++ extension init symbol/type usage.
libminifi/test/integration/extension-verification-test/CApiExtension.cpp	Updated C extension init symbol/type usage.
libminifi/src/utils/CProcessor.cpp	Switched custom metrics retrieval to use reported-metrics storage.
libminifi/src/minifi-api.cpp	Implemented renamed C API entry points; added context metric reporting and trigger-empty setter.
libminifi/src/core/state/nodes/AgentInformation.cpp	Updated include to new stable C API header.
libminifi/src/core/ProcessSession.cpp	Updated include to new stable C API header.
libminifi/src/core/Processor.cpp	Added forwarding Processor::setTriggerWhenEmpty.
libminifi/src/core/extension/Extension.cpp	Updated extension loader symbol names (minifi_init_*, minifi_api_version).
libminifi/src/core/extension/ApiVersion.cpp	Updated include to new stable C API header.
libminifi/include/utils/CProcessor.h	Updated callbacks/types to new C API; added internal trigger-when-empty/metrics wiring.
libminifi/include/utils/CControllerService.h	Updated callbacks/types to new C API.
libminifi/include/core/Processor.h	Added setTriggerWhenEmpty on Processor.
libminifi/include/core/extension/Extension.h	Updated includes to new stable C API header.
extensions/stable-api-testing/ZooProcessor.h	Updated return types to minifi_status.
extensions/stable-api-testing/ZooProcessor.cpp	Updated return types to minifi_status.
extensions/stable-api-testing/ExtensionInitializer.cpp	Updated exported symbols/types to new stable API names.
extensions/stable-api-testing/AnimalControllerServices.h	Updated return types to minifi_status.
extensions/stable-api-testing/AnimalControllerServices.cpp	Updated return types to minifi_status.
extensions/sftp/SFTPLoader.cpp	Updated C++ extension init symbol/type usage and includes ordering.
extensions/python/pythonloader/PyProcLoader.cpp	Updated init symbol and config access to new C API names.
extensions/python/pythonlibloader/PythonLibLoader.cpp	Updated init symbol and config access to new C API names; include ordering.
extensions/llamacpp/processors/RunLlamaCppInference.h	Updated stable API overrides; removed old metrics callback override.
extensions/llamacpp/processors/RunLlamaCppInference.cpp	Reports metrics via ProcessContext::reportMetrics() on trigger.
extensions/llamacpp/ExtensionInitializer.cpp	Updated exported symbols/types to new stable API names.
extensions/kafka/tests/PublishKafkaTests.cpp	Updated mock flow-file type name.
extensions/kafka/PublishKafka.h	Updated overrides to minifi_status.
extensions/kafka/PublishKafka.cpp	Updated overrides to minifi_status.
extensions/kafka/KafkaProcessorBase.h	Updated stable API include name.
extensions/kafka/ExtensionInitializer.cpp	Updated exported symbols/types to new stable API names.
extensions/kafka/ConsumeKafka.h	Updated overrides and helpers to minifi_status.
extensions/kafka/ConsumeKafka.cpp	Updated trigger-when-empty usage to new context API; status renames.
extensions/gcp/processors/PutGCSObject.h	Updated overrides to minifi_status.
extensions/gcp/processors/PutGCSObject.cpp	Updated status comparisons/types to minifi_status.
extensions/gcp/processors/ListGCSBucket.h	Updated overrides to minifi_status.
extensions/gcp/processors/ListGCSBucket.cpp	Updated status comparisons/types to minifi_status.
extensions/gcp/processors/GCSProcessor.h	Updated override to minifi_status.
extensions/gcp/processors/GCSProcessor.cpp	Updated override to minifi_status.
extensions/gcp/processors/FetchGCSObject.h	Updated overrides to minifi_status.
extensions/gcp/processors/FetchGCSObject.cpp	Updated overrides to minifi_status.
extensions/gcp/processors/DeleteGCSObject.h	Updated override to minifi_status.
extensions/gcp/processors/DeleteGCSObject.cpp	Updated override to minifi_status.
extensions/gcp/ExtensionInitializer.cpp	Updated exported symbols/types to new stable API names.
extensions/gcp/controllerservices/GCPCredentialsControllerService.h	Updated override to minifi_status.
extensions/gcp/controllerservices/GCPCredentialsControllerService.cpp	Updated override to minifi_status.
extensions/ExtensionInitializer.cpp	Updated C++ extension init symbol/type usage and includes ordering.
extensions/aws/AwsLoader.cpp	Updated init symbol/types to new stable API names; include ordering.
Extensions.md	Updated extension doc symbol names (still needs further alignment with renamed types/APIs).
extension-framework/include/utils/ExtensionInitUtils.h	Updated helper to use new stable C API types.
extension-framework/cpp-extension-lib/src/utils/minifi-c-utils.cpp	Updated status/validator types to new names.
extension-framework/cpp-extension-lib/src/core/ProcessSession.cpp	Updated C API calls/types to new names.
extension-framework/cpp-extension-lib/src/core/ProcessorImpl.cpp	Updated return types to minifi_status.
extension-framework/cpp-extension-lib/src/core/ProcessContext.cpp	Updated C API calls/types; added metrics reporting + trigger-when-empty setters.
extension-framework/cpp-extension-lib/src/core/logging/Logger.cpp	Updated C API calls/types; currently stubs level/max-size (needs fix).
extension-framework/cpp-extension-lib/src/core/ControllerServiceImpl.cpp	Updated return types to minifi_status.
extension-framework/cpp-extension-lib/src/core/ControllerServiceContext.cpp	Updated C API calls/types to new names.
extension-framework/cpp-extension-lib/mocklib/src/MockProcessSession.cpp	Updated mock flow-file type name.
extension-framework/cpp-extension-lib/mocklib/src/MockProcessContext.cpp	Updated controller-service type name; removed hasNonEmptyProperty mock.
extension-framework/cpp-extension-lib/mocklib/src/mock-minifi-c.cpp	Removed old mock C API implementation.
extension-framework/cpp-extension-lib/mocklib/src/mock-minifi-api.cpp	Added mock implementation for the new stable C API.
extension-framework/cpp-extension-lib/mocklib/include/MockProcessSession.h	Updated mock flow-file type name throughout.
extension-framework/cpp-extension-lib/mocklib/include/MockProcessContext.h	Added metrics/trigger-when-empty mock support; updated controller-service type.
extension-framework/cpp-extension-lib/libtest/CProcessorTestUtils.h	Updated class-definition types + controller-service bundle-name plumbing.
extension-framework/cpp-extension-lib/include/api/utils/minifi-c-utils.h	Updated string/status/validator/property-definition types; renamed type -> allowed_type.
extension-framework/cpp-extension-lib/include/api/core/Resource.h	Updated generated class definition structs/callbacks to new names; removed metrics callback path.
extension-framework/cpp-extension-lib/include/api/core/ProcessSession.h	Updated C API include/type usage.
extension-framework/cpp-extension-lib/include/api/core/ProcessorImpl.h	Updated return types; removed trigger-when-empty + metrics members from wrapper base.
extension-framework/cpp-extension-lib/include/api/core/ProcessContext.h	Updated controller-service type + added metrics/trigger-when-empty APIs.
extension-framework/cpp-extension-lib/include/api/core/logging/Logger.h	Updated logger handle type to new C API name.
extension-framework/cpp-extension-lib/include/api/core/FlowFile.h	Updated flow-file handle type to new C API name.
extension-framework/cpp-extension-lib/include/api/core/ControllerServiceImpl.h	Updated return types to minifi_status.
extension-framework/cpp-extension-lib/include/api/core/ControllerServiceContext.h	Updated controller-service context handle type to new C API name.
core-framework/include/core/ProcessorImpl.h	Marked setTriggerWhenEmpty override to satisfy new ProcessorApi.
.github/workflows/create-release-artifacts.yml	Updated SDK artifact paths to minifi-api.h / minifi-api.def.
.github/references/ubuntu_22_04_clang_arm_manifest.json	Manifest reference updates for controller-service provided API metadata.
.clang-format	Tightened formatting rules (short blocks/ifs/enums).

Comments suppressed due to low confidence (2)

Extensions.md:83

• The minifi_init_cpp_extension example still uses the old C API names (MinifiExtensionContext, MinifiConfigGet, MinifiStringView, MinifiExtensionDefinition). After the rename to minifi_* this snippet won't compile against the new headers.

extern "C" void minifi_init_cpp_extension(MinifiExtensionContext* extension_context) {
  static PythonLibLoader python_lib_loader([&] (std::string_view key) -> std::optional<std::string> {
    std::optional<std::string> result;
    MinifiConfigGet(extension_context, minifi::utils::toStringView(key), [] (void* user_data, MinifiStringView value) {
      *static_cast<std::optional<std::string>*>(user_data) = std::string{value.data, value.length};

libminifi/src/minifi-api.cpp:429

• MinifiLoggerSetMaxLogSize is still defined inside the extern "C" block, but it no longer appears in minifi-api.h or the Windows export list (minifi-api.def). Leaving this legacy, CamelCase symbol in the binary risks accidentally keeping/introducing ABI surface that the PR description says was removed; it should be deleted (or renamed+declared+exported if it is still intended to be supported).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.