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https://issues.apache.org/jira/browse/NIFI-5859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16710181#comment-16710181
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ASF GitHub Bot commented on NIFI-5859:
--------------------------------------
Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/3192#discussion_r239102517
--- Diff:
nifi-api/src/main/java/org/apache/nifi/documentation/AbstractDocumentationWriter.java
---
@@ -0,0 +1,301 @@
+/*
+ * 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.
+ */
+package org.apache.nifi.documentation;
+
+import org.apache.nifi.annotation.behavior.DynamicProperties;
+import org.apache.nifi.annotation.behavior.DynamicProperty;
+import org.apache.nifi.annotation.behavior.DynamicRelationship;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.ReadsAttribute;
+import org.apache.nifi.annotation.behavior.ReadsAttributes;
+import org.apache.nifi.annotation.behavior.Restricted;
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.behavior.SystemResourceConsideration;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.DeprecationNotice;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.components.ConfigurableComponent;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.controller.ControllerService;
+import
org.apache.nifi.documentation.init.DocumentationControllerServiceInitializationContext;
+import
org.apache.nifi.documentation.init.DocumentationProcessorInitializationContext;
+import
org.apache.nifi.documentation.init.DocumentationReportingInitializationContext;
+import org.apache.nifi.processor.Processor;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.reporting.InitializationException;
+import org.apache.nifi.reporting.ReportingTask;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Base class for DocumentationWriter that simplifies iterating over all
information for a component, creating a separate method
+ * for each, to ensure that implementations properly override all methods
and therefore properly account for all information about
+ * a component.
+ *
+ * Please note that while this class lives within the nifi-api, it is
provided primarily as a means for documentation components within
+ * the NiFi NAR Maven Plugin. Its home is the nifi-api, however, because
the API is needed in order to extract the relevant information and
+ * the NAR Maven Plugin cannot have a direct dependency on nifi-api (doing
so would cause a circular dependency). By having this homed within
+ * the nifi-api, the Maven plugin is able to discover the class
dynamically and invoke the one or two methods necessary to create the
documentation.
+ *
+ * This is a new capability in 1.9.0 in preparation for the Extension
Registry and therefore, you should
+ * <b>NOTE WELL:</b> At this time, while this class is part of nifi-api,
it is still evolving and may change in a non-backward-compatible manner or even
be
+ * removed from one incremental release to the next. Use at your own risk!
+ */
+public abstract class AbstractDocumentationWriter implements
DocumentationWriter {
+
+ @Override
+ public final void write(final ConfigurableComponent component) throws
IOException {
+ write(component, null);
+ }
+
+ @Override
+ public final void write(final ConfigurableComponent component, final
Collection<ProvidedServiceAPI> providedServices) throws IOException {
+ initialize(component);
+
+ writeHeader(component);
+ writeBody(component);
+
+ if (providedServices != null && component instanceof
ControllerService) {
+ writeProvidedServices(providedServices);
+ }
+
+ writeFooter(component);
+ }
+
+ private void initialize(final ConfigurableComponent component) {
+ try {
+ if (component instanceof Processor) {
+ initialize((Processor) component);
+ } else if (component instanceof ControllerService) {
+ initialize((ControllerService) component);
+ } else if (component instanceof ReportingTask) {
+ initialize((ReportingTask) component);
+ }
+ } catch (final InitializationException ie) {
+ throw new RuntimeException("Failed to initialize " +
component, ie);
+ }
+ }
+
+ protected void initialize(final Processor processor) {
+ processor.initialize(new
DocumentationProcessorInitializationContext());
+ }
+
+ protected void initialize(final ControllerService service) throws
InitializationException {
+ service.initialize(new
DocumentationControllerServiceInitializationContext());
+ }
+
+ protected void initialize(final ReportingTask reportingTask) throws
InitializationException {
+ reportingTask.initialize(new
DocumentationReportingInitializationContext());
+ }
+
+ protected void writeBody(final ConfigurableComponent component) throws
IOException {
+ final String additionalDetails =
getAdditionalDetailsHtml(component);
+
+ writeExtensionName(component.getClass().getName());
--- End diff --
I intended to include this, but apparently I missed it. Will update that.
> Update NAR maven plugin to include information about Extensions
> ---------------------------------------------------------------
>
> Key: NIFI-5859
> URL: https://issues.apache.org/jira/browse/NIFI-5859
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Tools and Build
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
>
> In order to have the NiFi Registry host any extensions, the registry will
> need a way to know what extensions exist in a given NAR. Currently, that
> information is not available directly.
> The NAR maven plugin should be updated to provide a list of extensions and
> for each one, provide at least the following minimal information:
> * Extension Type
> * Extension Name
> * Capability Description
> * Whether or not the component is Restricted, "sub-restrictions" it has, and
> explanations of both
> * Any Tags that the component has
> * If the component is a Controller Service, any Controller Service API's
> that it provides
> Additionally, it would be ideal to provide all documentation for the
> component within the NAR. It is best, though, not to write the documentation
> in HTML as is done now but rather in XML or some sort of form that provides
> the information in a structured way without any styling. This would allow the
> documentation to be rendered consistently, even if the styling changes from 1
> version to the next.
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