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https://issues.apache.org/jira/browse/NIFI-3688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063819#comment-16063819
]
ASF GitHub Bot commented on NIFI-3688:
--------------------------------------
Github user mattyb149 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1662#discussion_r124126084
--- Diff:
nifi-nar-bundles/nifi-groovyx-bundle/nifi-groovyx-processors/src/main/java/org/apache/nifi/processors/groovyx/GroovyMethods.java
---
@@ -0,0 +1,85 @@
+/*
+ * 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.processors.groovyx;
+
+import groovy.lang.DelegatingMetaClass;
+import groovy.lang.GroovySystem;
+
+import org.apache.nifi.processors.groovyx.flow.ProcessSessionWrap;
+import org.apache.nifi.processors.groovyx.flow.SessionFile;
+
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.flowfile.FlowFile;
+
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * Class to initialize additional groovy methods to work with SessionFile,
Relationship, and Sessions easier
+ */
+class GroovyMethods {
+ private static boolean initialized = false;
+
+ static void init() {
+ if (!initialized) {
+ synchronized (GroovyMethods.class) {
+ if (!initialized) {
+ initialized = metaRelationship();
+ }
+ }
+ }
+ }
+
+ private static boolean metaRelationship() {
+
GroovySystem.getMetaClassRegistry().setMetaClass(Relationship.class, new
DelegatingMetaClass(Relationship.class) {
+ @Override
+ public Object invokeMethod(Object object, String methodName,
Object[] args) {
+ if (object instanceof Relationship) {
+ if ("leftShift".equals(methodName) && args.length ==
1) {
+ if (args[0] instanceof SessionFile) {
+ return this.leftShift((Relationship) object,
(SessionFile) args[0]);
+ } else if (args[0] instanceof Collection) {
+ return this.leftShift((Relationship) object,
(Collection) args[0]);
+ }
+ }
+ }
+ return super.invokeMethod(object, methodName, args);
+ }
+
+ /** to support: REL_SUCCESS << sessionFile */
+ private Relationship leftShift(Relationship r, SessionFile f) {
--- End diff --
These are great! Should we support right-shift too?
`sessionFile >> REL_SUCCESS`
If having both is too confusing, then this one will work just fine!
> 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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