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Creating Custom Processor In Apache Nifi


Apache NIFI “Execute Processor”Apache Nifi Execute Process ProcessorApache Nifi ExecuteSQL ProcessorApache NiFi tuning issuesHow to create a PutInfluxdb processor in Apache nifi?Apache nifi - how to implement “Continue if no records found in GetMongo processor”Nifi - Process the files based on count or time elapsed?Nifi Processor gets triggered twice for single Input flow fileNIFI - QueryDatabaseTable processor. How to query rows which is modified?Running python code in Apache Nifi ExecuteStreamCommand






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0















I am building an custom processor to process flow file , to process the flow file i need to read an CSV file from my local file system. I created an proerty descriptor CSV_PATH as follows



public static final PropertyDescriptor CSV_PATH = new 
PropertyDescriptor
.Builder().name("CSV Path")
.displayName("CSV Path")
.description("CSV Path Reader")
.required(true)
.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
.build();



@Override

protected void init(final ProcessorInitializationContext context)

final List<PropertyDescriptor> descriptors = new
ArrayList<PropertyDescriptor>();

descriptors.add(JSON_PATH);

descriptors.add(CSV_PATH);

this.descriptors = Collections.unmodifiableList(descriptors);



final Set<Relationship> relationships = new HashSet<Relationship>();

relationships.add(SUCCESS);

this.relationships = Collections.unmodifiableSet(relationships);




Now I wants to get the value of CSV_PATH property set in UI while configuring processor. I am not able to get the CSV_PATH value. Also If I hardcode filepath in code then still I am not able to read CSV from local file system.










share|improve this question






























    0















    I am building an custom processor to process flow file , to process the flow file i need to read an CSV file from my local file system. I created an proerty descriptor CSV_PATH as follows



    public static final PropertyDescriptor CSV_PATH = new 
    PropertyDescriptor
    .Builder().name("CSV Path")
    .displayName("CSV Path")
    .description("CSV Path Reader")
    .required(true)
    .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
    .build();



    @Override

    protected void init(final ProcessorInitializationContext context)

    final List<PropertyDescriptor> descriptors = new
    ArrayList<PropertyDescriptor>();

    descriptors.add(JSON_PATH);

    descriptors.add(CSV_PATH);

    this.descriptors = Collections.unmodifiableList(descriptors);



    final Set<Relationship> relationships = new HashSet<Relationship>();

    relationships.add(SUCCESS);

    this.relationships = Collections.unmodifiableSet(relationships);




    Now I wants to get the value of CSV_PATH property set in UI while configuring processor. I am not able to get the CSV_PATH value. Also If I hardcode filepath in code then still I am not able to read CSV from local file system.










    share|improve this question


























      0












      0








      0








      I am building an custom processor to process flow file , to process the flow file i need to read an CSV file from my local file system. I created an proerty descriptor CSV_PATH as follows



      public static final PropertyDescriptor CSV_PATH = new 
      PropertyDescriptor
      .Builder().name("CSV Path")
      .displayName("CSV Path")
      .description("CSV Path Reader")
      .required(true)
      .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
      .build();



      @Override

      protected void init(final ProcessorInitializationContext context)

      final List<PropertyDescriptor> descriptors = new
      ArrayList<PropertyDescriptor>();

      descriptors.add(JSON_PATH);

      descriptors.add(CSV_PATH);

      this.descriptors = Collections.unmodifiableList(descriptors);



      final Set<Relationship> relationships = new HashSet<Relationship>();

      relationships.add(SUCCESS);

      this.relationships = Collections.unmodifiableSet(relationships);




      Now I wants to get the value of CSV_PATH property set in UI while configuring processor. I am not able to get the CSV_PATH value. Also If I hardcode filepath in code then still I am not able to read CSV from local file system.










      share|improve this question














      I am building an custom processor to process flow file , to process the flow file i need to read an CSV file from my local file system. I created an proerty descriptor CSV_PATH as follows



      public static final PropertyDescriptor CSV_PATH = new 
      PropertyDescriptor
      .Builder().name("CSV Path")
      .displayName("CSV Path")
      .description("CSV Path Reader")
      .required(true)
      .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
      .build();



      @Override

      protected void init(final ProcessorInitializationContext context)

      final List<PropertyDescriptor> descriptors = new
      ArrayList<PropertyDescriptor>();

      descriptors.add(JSON_PATH);

      descriptors.add(CSV_PATH);

      this.descriptors = Collections.unmodifiableList(descriptors);



      final Set<Relationship> relationships = new HashSet<Relationship>();

      relationships.add(SUCCESS);

      this.relationships = Collections.unmodifiableSet(relationships);




      Now I wants to get the value of CSV_PATH property set in UI while configuring processor. I am not able to get the CSV_PATH value. Also If I hardcode filepath in code then still I am not able to read CSV from local file system.







      apache-nifi






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Mar 27 at 16:46









      codercoder

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          1 Answer
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          2















          You want to use the following code to retrieve the value of the PropertyDescriptor from the ProcessContext:



          @Override
          public void onTrigger(final ProcessContext context, final ProcessSession session)
          FlowFile flowFile = session.get();
          if (flowFile == null)
          return;


          final String csvPath = context.getProperty(CSV_PATH).getValue();

          // Do something with csvPath




          If you decide to support NiFi Expression Language in that property descriptor, you will also want to evaluate for that:



          final String csvPath = context.getProperty(CSV_PATH).evaluateAttributeExpressions().getValue();



          There are additional method overrides for that, including flowfile attributes, variable registry, custom decorators, etc.



          This is documented in the Apache NiFi Developer's Guide. I recently did a presentation at Dataworks Summit Barcelona 2019 covering custom processor development with some best practices included and examples that may be helpful. You can also look at any existing processor in the NiFi codebase to see examples.






          share|improve this answer
























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            1 Answer
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            active

            oldest

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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            2















            You want to use the following code to retrieve the value of the PropertyDescriptor from the ProcessContext:



            @Override
            public void onTrigger(final ProcessContext context, final ProcessSession session)
            FlowFile flowFile = session.get();
            if (flowFile == null)
            return;


            final String csvPath = context.getProperty(CSV_PATH).getValue();

            // Do something with csvPath




            If you decide to support NiFi Expression Language in that property descriptor, you will also want to evaluate for that:



            final String csvPath = context.getProperty(CSV_PATH).evaluateAttributeExpressions().getValue();



            There are additional method overrides for that, including flowfile attributes, variable registry, custom decorators, etc.



            This is documented in the Apache NiFi Developer's Guide. I recently did a presentation at Dataworks Summit Barcelona 2019 covering custom processor development with some best practices included and examples that may be helpful. You can also look at any existing processor in the NiFi codebase to see examples.






            share|improve this answer





























              2















              You want to use the following code to retrieve the value of the PropertyDescriptor from the ProcessContext:



              @Override
              public void onTrigger(final ProcessContext context, final ProcessSession session)
              FlowFile flowFile = session.get();
              if (flowFile == null)
              return;


              final String csvPath = context.getProperty(CSV_PATH).getValue();

              // Do something with csvPath




              If you decide to support NiFi Expression Language in that property descriptor, you will also want to evaluate for that:



              final String csvPath = context.getProperty(CSV_PATH).evaluateAttributeExpressions().getValue();



              There are additional method overrides for that, including flowfile attributes, variable registry, custom decorators, etc.



              This is documented in the Apache NiFi Developer's Guide. I recently did a presentation at Dataworks Summit Barcelona 2019 covering custom processor development with some best practices included and examples that may be helpful. You can also look at any existing processor in the NiFi codebase to see examples.






              share|improve this answer



























                2














                2










                2









                You want to use the following code to retrieve the value of the PropertyDescriptor from the ProcessContext:



                @Override
                public void onTrigger(final ProcessContext context, final ProcessSession session)
                FlowFile flowFile = session.get();
                if (flowFile == null)
                return;


                final String csvPath = context.getProperty(CSV_PATH).getValue();

                // Do something with csvPath




                If you decide to support NiFi Expression Language in that property descriptor, you will also want to evaluate for that:



                final String csvPath = context.getProperty(CSV_PATH).evaluateAttributeExpressions().getValue();



                There are additional method overrides for that, including flowfile attributes, variable registry, custom decorators, etc.



                This is documented in the Apache NiFi Developer's Guide. I recently did a presentation at Dataworks Summit Barcelona 2019 covering custom processor development with some best practices included and examples that may be helpful. You can also look at any existing processor in the NiFi codebase to see examples.






                share|improve this answer













                You want to use the following code to retrieve the value of the PropertyDescriptor from the ProcessContext:



                @Override
                public void onTrigger(final ProcessContext context, final ProcessSession session)
                FlowFile flowFile = session.get();
                if (flowFile == null)
                return;


                final String csvPath = context.getProperty(CSV_PATH).getValue();

                // Do something with csvPath




                If you decide to support NiFi Expression Language in that property descriptor, you will also want to evaluate for that:



                final String csvPath = context.getProperty(CSV_PATH).evaluateAttributeExpressions().getValue();



                There are additional method overrides for that, including flowfile attributes, variable registry, custom decorators, etc.



                This is documented in the Apache NiFi Developer's Guide. I recently did a presentation at Dataworks Summit Barcelona 2019 covering custom processor development with some best practices included and examples that may be helpful. You can also look at any existing processor in the NiFi codebase to see examples.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Mar 27 at 18:01









                AndyAndy

                9,7601 gold badge25 silver badges52 bronze badges




                9,7601 gold badge25 silver badges52 bronze badges





















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