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https://issues.apache.org/jira/browse/NIFI-3688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16239506#comment-16239506
]
ASF GitHub Bot commented on NIFI-3688:
--------------------------------------
Github user dlukyanov commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1662#discussion_r148955987
--- Diff:
nifi-nar-bundles/nifi-groovyx-bundle/nifi-groovyx-processors/src/main/resources/docs/org.apache.nifi.processors.groovyx.ExecuteGroovyScript/additionalDetails.html
---
@@ -0,0 +1,202 @@
+<!DOCTYPE html>
+<html lang="en">
+<!--
+ 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.
+-->
+<head>
+ <meta charset="utf-8" />
+ <title>Groovy</title>
+ <!--link rel="stylesheet" href="../../css/component-usage.css"
type="text/css" /-->
+ <link rel="stylesheet" href="/nifi-docs/css/component-usage.css"
type="text/css" />
+</head>
+
+<body>
+<h2>Summary</h2>
+<p>This is a grooviest groovy script :)</p>
+<h2>Script Bindings:</h2>
+<table>
+<tr><th>variable</th><th>type</th><th>description</th></tr>
+<tr>
+ <td>session</td>
+ <td>org.apache.nifi.processor.ProcessSession</td>
+ <td>the session that is used to get, change, and transfer input
files</td>
+</tr>
+<tr>
+ <td>context</td>
+ <td>org.apache.nifi.processor.ProcessContext</td>
+ <td>the context (almost unusefull)</td>
+</tr>
+<tr>
+ <td>log</td>
+ <td>org.apache.nifi.logging.ComponentLog</td>
+ <td>the logger for this processor instance</td>
+</tr>
+<tr>
+ <td>REL_SUCCESS</td>
+ <td>org.apache.nifi.processor.Relationship</td>
+ <td>the success relationship</td>
+</tr>
+<tr>
+ <td>REL_FAILURE</td>
+ <td>org.apache.nifi.processor.Relationship</td>
+ <td>the failure relationship</td>
+</tr>
+<tr>
+ <td>flowFile</td>
+ <td>org.apache.nifi.flowfile.FlowFile</td>
+ <td>Binded only if the property `Require flow file`=true for the
processor</td>
+</tr>
+<tr>
+ <td>CTL</td>
+ <td>java.util.HashMap</td>
+ <td>Map populated with controller services binded through `CTL.*`
processor properties</td>
+</tr>
+<tr>
+ <td>Dynamic processor properties</td>
+ <td>org.apache.nifi.components.PropertyDescriptor</td>
+ <td>All processor properties not started with `CTL.` are binded to
script variables</td>
+</tr>
+</table>
+
+<h2>CTL map</h2>
+<p>
+CTL.* objects accessible if corresponding processor property defined.<br/>
+<b>Example:</b> if you defined property <code>`CTL.cache`</code> to
DistributedMapCacheClientService, then you can access it from code
<code>CTL.cache</code><br/>
--- End diff --
Yes, this adds kind of limit. All custom properties with name beginning
with `CTL.` automatically supposed to be linked to controller services. It
means you can't define custom `CTL.*` property with plain string value. After
`CTL.`there could be any chars. On the level of groovy script the additional
predefined variable binded : `CTL` - a hashmap with substring after `CTL.` as a
key and linked controller service as a value. If you defined `CTL.aaa` and
linked it to distributed cache client service, then on level of groovy it'slike
`def CTL=[:]` and `CTL['aaa']=LINK_TO_THE_SERVICE`. So, in groovy you can
access this service `CTL.aaa.someServiceMethod(...)`
The only conflict expected when you'll try to define custom script variable
with name `CTL`. Otherwise-no conflicts.
> Create extended groovy scripting processor
> ------------------------------------------
>
> Key: NIFI-3688
> URL: https://issues.apache.org/jira/browse/NIFI-3688
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Extensions
> Reporter: Dmitry Lukyanov
> Priority: Minor
>
> The idea is to simplify groovy scripting.
> Main targets:
> - to be compatible with existing groovy scripting
> - simplify read/write attributes
> - simplify read/write content
> - avoid closure casting to nifi types like `StreamCallback`
> - simplify and provide visibility when accessing to controller services from
> script
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