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https://issues.apache.org/jira/browse/NIFI-3034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15866650#comment-15866650
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ASF GitHub Bot commented on NIFI-3034:
--------------------------------------
Github user joewitt commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1323#discussion_r101140622
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/UpdateCounter.java
---
@@ -0,0 +1,131 @@
+/*
+ * 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.standard;
+
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.ReadsAttribute;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.logging.ComponentLog;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.ProcessorInitializationContext;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.HashSet;
+
+/**
+ * Created by onb813 on 11/10/16.
+ */
+
+@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
+@Tags({"counter","tracking","provenance"})
+@CapabilityDescription("Can update counter value and can get counter value
to use")
+@ReadsAttribute(attribute = "counterName", description = "The name of the
counter to update/get.")
+public class UpdateCounter extends AbstractProcessor {
+
+
+
+ public static final PropertyDescriptor CounterName = new
PropertyDescriptor.Builder()
+ .name("CounterName")
+ .description("The name of the counter you want to set the
value off - supports expression language like ${counterName}")
+ .required(true)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .expressionLanguageSupported(true)
+ .build();
+
+ //TODO Can this support expression language too?
+ public static final PropertyDescriptor Delta = new
PropertyDescriptor.Builder()
+ .name("DELTA")
+ .description("If positive increments counter by delta - if
negative decrements counter by delta")
+ .required(true)
+ .addValidator(StandardValidators.INTEGER_VALIDATOR)
+ .expressionLanguageSupported(false)
--- End diff --
it would be awesome if delta was expression language enabled. Then the
amount of change could come from a flow file attribute or expression language
value. I could see this being really helpful for the purpose of this processor.
> New Processor to use Counters
> -----------------------------
>
> Key: NIFI-3034
> URL: https://issues.apache.org/jira/browse/NIFI-3034
> Project: Apache NiFi
> Issue Type: New Feature
> Reporter: Sai Peddy
> Priority: Minor
>
> The processor lets you update counters (increment and decrement) and retrieve
> counter values as well. To help keep track of data going through the system.
> This allows for use of counters within the flow - not just API.
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