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https://issues.apache.org/jira/browse/NIFI-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15319315#comment-15319315
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ASF GitHub Bot commented on NIFI-1974:
--------------------------------------
Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/501#discussion_r66146086
--- Diff:
nifi-api/src/main/java/org/apache/nifi/registry/VariableRegistry.java ---
@@ -0,0 +1,27 @@
+/*
+ * 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.registry;
+
+
+import java.util.Map;
+
+public interface VariableRegistry {
+
+ Map<String, String> getVariables();
--- End diff --
It seems useful to me to include a `Set<String> getVariableNames()` method,
perhaps?
> Support Custom Properties in Expression Language
> ------------------------------------------------
>
> Key: NIFI-1974
> URL: https://issues.apache.org/jira/browse/NIFI-1974
> Project: Apache NiFi
> Issue Type: New Feature
> Reporter: Yolanda M. Davis
> Assignee: Yolanda M. Davis
>
> Add a property in "nifi.properties" config file to allows users to specify a
> list of custom properties files (containing data such as environmental
> specific values, or sensitive values, etc.). The key/value pairs should be
> loaded upon NIFI startup and availbale to processors for use in expression
> languages.
> Optimally this will lay the groundwork for a UI driven Variable Registry.
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