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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NIFI-3034) New Processor to use Counters
Date Tue, 14 Feb 2017 20:50:41 GMT

    [ https://issues.apache.org/jira/browse/NIFI-3034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15866641#comment-15866641
] 

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_r101139641
  
    --- 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)
    +            .build();
    +
    +
    +    public static final Relationship SUCCESS = new Relationship.Builder()
    +            .name("success")
    +            .description("Counter was updated/retrieved")
    +            .build();
    +
    +    public static final Relationship FAILURE = new Relationship.Builder()
    +            .name("failure")
    +            .description("Counter was not updated/retrieved")
    +            .build();
    +
    +    private List<PropertyDescriptor> descriptors;
    +
    +    private Set<Relationship> relationships;
    +
    +
    +
    +    @Override
    +    protected void init(final ProcessorInitializationContext context) {
    +        // Create the Property descriptors.
    +        final List<PropertyDescriptor> descriptors = new ArrayList<>();
    +        descriptors.add(CounterName);
    +        descriptors.add(Delta);
    +        this.descriptors = Collections.unmodifiableList(descriptors);
    +
    +        // Create the Relationships.
    +        final Set<Relationship> relationships = new HashSet<>();
    +        relationships.add(SUCCESS);
    +        relationships.add(FAILURE);
    +        this.relationships = Collections.unmodifiableSet(relationships);
    +    }
    +
    +
    +    @Override
    +    public Set<Relationship> getRelationships() {
    +        return relationships;
    +    }
    +
    +    @Override
    +    protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
    +        return descriptors;
    +    }
    +
    +    @Override
    +    public void onTrigger(ProcessContext context, ProcessSession session) throws ProcessException
{
    +
    +        //TODO this would be for the get part of the processor
    --- End diff --
    
    please remove these comments.


> 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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