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https://issues.apache.org/jira/browse/MINIFICPP-39?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210995#comment-16210995
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ASF GitHub Bot commented on MINIFICPP-39:
-----------------------------------------
Github user phrocker commented on a diff in the pull request:
https://github.com/apache/nifi-minifi-cpp/pull/148#discussion_r145690194
--- Diff: libminifi/include/processors/FocusArchiveEntry.h ---
@@ -0,0 +1,115 @@
+/**
+ * @file FocusArchiveEntry.h
+ * FocusArchiveEntry class declaration
+ *
+ * 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 LIBMINIFI_INCLUDE_PROCESSORS_FOCUSARCHIVEENTRY_H_
+#define LIBMINIFI_INCLUDE_PROCESSORS_FOCUSARCHIVEENTRY_H_
+
+#include <list>
+#include <memory>
+#include <string>
+
+#include "FlowFileRecord.h"
+#include "core/Processor.h"
+#include "core/ProcessSession.h"
+#include "core/Core.h"
+#include "core/logging/LoggerConfiguration.h"
+#include "core/Resource.h"
+
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace processors {
+
+using logging::LoggerFactory;
+
+//! FocusArchiveEntry Class
+class FocusArchiveEntry : public core::Processor {
+ public:
+ //! Constructor
+ /*!
+ * Create a new processor
+ */
+ explicit FocusArchiveEntry(std::string name, uuid_t uuid = NULL)
+ : core::Processor(name, uuid),
+ logger_(logging::LoggerFactory<FocusArchiveEntry>::getLogger()) {
+ }
+ //! Destructor
+ virtual ~FocusArchiveEntry() {
+ }
+ //! Processor Name
+ static constexpr char const* ProcessorName = "FocusArchiveEntry";
+ //! Supported Properties
+ static core::Property Path;
+ //! Supported Relationships
+ static core::Relationship Success;
+
+ bool set_del_or_update_attr(std::shared_ptr<core::FlowFile>, const
std::string, std::string*) const;
--- End diff --
why std::string * over const std::string &? The semantics imply you will
be changing the third argument.
> Create FocusArchive processor
> -----------------------------
>
> Key: MINIFICPP-39
> URL: https://issues.apache.org/jira/browse/MINIFICPP-39
> Project: NiFi MiNiFi C++
> Issue Type: Task
> Reporter: Andrew Christianson
> Assignee: Andrew Christianson
> Priority: Minor
>
> Create an FocusArchive processor which implements a lens over an archive
> (tar, etc.). A concise, though informal, definition of a lens is as follows:
> "Essentially, they represent the act of “peering into” or “focusing in on”
> some particular piece/path of a complex data object such that you can more
> precisely target particular operations without losing the context or
> structure of the overall data you’re working with."
> https://medium.com/@dtipson/functional-lenses-d1aba9e52254#.hdgsvbraq
> Why an FocusArchive in MiNiFi? Simply put, it will enable us to "focus in on"
> an entry in the archive, perform processing *in-context* of that entry, then
> re-focus on the overall archive. This allows for transformation or other
> processing of an entry in the archive without losing the overall context of
> the archive.
> Initial format support is tar, due to its simplicity and ubiquity.
> Attributes:
> - Path (the path in the archive to focus; "/" to re-focus the overall archive)
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