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How to define ControllerService with expression language in Nifi

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As part of a complex model of flows that are replicated across domains, i am trying to generalise definition of custom controllerservices that are used in many processors.

Adding a ControllerService to a Processor works the same as with properties: with the PropertyDescriptor.Builder which accepts expressionLanguageSupported(). However, it is not well documented how to configure this through the ui, or what additional steps need to be taken in the code of the processor that accepts said ControllerService

When i simply add the expressionLanguageSupported(true) method, the dropdown changes to a free input with the uuid of the configured service.
I tried putting this uuid in a process group scoped variable called service1, but the validator won't accept $service1

What am i doing wrong? we are using Nifi 1.6

java service controller expression apache-nifi

share|improve this question

asked Mar 25 at 15:02

chaixdevchaixdev

6588 bronze badges

add a comment | 

0

As part of a complex model of flows that are replicated across domains, i am trying to generalise definition of custom controllerservices that are used in many processors.

Adding a ControllerService to a Processor works the same as with properties: with the PropertyDescriptor.Builder which accepts expressionLanguageSupported(). However, it is not well documented how to configure this through the ui, or what additional steps need to be taken in the code of the processor that accepts said ControllerService

When i simply add the expressionLanguageSupported(true) method, the dropdown changes to a free input with the uuid of the configured service.
I tried putting this uuid in a process group scoped variable called service1, but the validator won't accept $service1

What am i doing wrong? we are using Nifi 1.6

java service controller expression apache-nifi

share|improve this question

asked Mar 25 at 15:02

chaixdevchaixdev

6588 bronze badges

add a comment | 

As part of a complex model of flows that are replicated across domains, i am trying to generalise definition of custom controllerservices that are used in many processors.

Adding a ControllerService to a Processor works the same as with properties: with the PropertyDescriptor.Builder which accepts expressionLanguageSupported(). However, it is not well documented how to configure this through the ui, or what additional steps need to be taken in the code of the processor that accepts said ControllerService

When i simply add the expressionLanguageSupported(true) method, the dropdown changes to a free input with the uuid of the configured service.
I tried putting this uuid in a process group scoped variable called service1, but the validator won't accept $service1

What am i doing wrong? we are using Nifi 1.6

java service controller expression apache-nifi

share|improve this question

asked Mar 25 at 15:02

chaixdevchaixdev

6588 bronze badges

share|improve this question

asked Mar 25 at 15:02

chaixdevchaixdev

6588 bronze badges

share|improve this question

asked Mar 25 at 15:02

chaixdevchaixdev

6588 bronze badges

asked Mar 25 at 15:02

chaixdevchaixdev

6588 bronze badges

asked Mar 25 at 15:02

chaixdevchaixdev

6588 bronze badges

1 Answer
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3

Controller Services are not designed to work that way. You can use expression language but as you say, you will be forced to pass the controller service id.

There is a solution to this by using a lookup service. For example, the SQL processors can use DBCPConnectionPoolLookup to dynamically pass a DBCPConnectionPool controller service to the processor.

You could use this way in your bundle.

EDIT:

You should also know that if you reference the controller service without expression language support, and make a template out of your flow, when you will deploy it, the processor will reference the controller service that was just created with your template.

share|improve this answer

edited Mar 26 at 13:37

answered Mar 25 at 15:19

Ben YaakobiBen Yaakobi

5871212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i'm fine with passing the controller service id. I mainy want to avoid having to manually go over each processor to select the appropriate controllerservice each time i deploy a template. To be specific about your answer, this id can not be provided by a scoped variable? if so, allowing expression language for controller service properties seems pretty useless?
  
  – chaixdev
  Mar 26 at 10:38
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @chaixdev It's not useless. You have to pass the controller service id, but you may pass it using the variable registry and expression language.
  
  – Ben Yaakobi
  Mar 26 at 11:02
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @chaixdev also, see the edit. I think it would be more fit to just use it as is since NiFi support referencing controller services within a template.
  
  – Ben Yaakobi
  Mar 26 at 13:38
  
  

  
  
  
  

add a comment | 

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3

Controller Services are not designed to work that way. You can use expression language but as you say, you will be forced to pass the controller service id.

There is a solution to this by using a lookup service. For example, the SQL processors can use DBCPConnectionPoolLookup to dynamically pass a DBCPConnectionPool controller service to the processor.

You could use this way in your bundle.

EDIT:

You should also know that if you reference the controller service without expression language support, and make a template out of your flow, when you will deploy it, the processor will reference the controller service that was just created with your template.

share|improve this answer

edited Mar 26 at 13:37

answered Mar 25 at 15:19

Ben YaakobiBen Yaakobi

5871212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i'm fine with passing the controller service id. I mainy want to avoid having to manually go over each processor to select the appropriate controllerservice each time i deploy a template. To be specific about your answer, this id can not be provided by a scoped variable? if so, allowing expression language for controller service properties seems pretty useless?
  
  – chaixdev
  Mar 26 at 10:38
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @chaixdev It's not useless. You have to pass the controller service id, but you may pass it using the variable registry and expression language.
  
  – Ben Yaakobi
  Mar 26 at 11:02
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @chaixdev also, see the edit. I think it would be more fit to just use it as is since NiFi support referencing controller services within a template.
  
  – Ben Yaakobi
  Mar 26 at 13:38
  
  

  
  
  
  

add a comment | 

3

Controller Services are not designed to work that way. You can use expression language but as you say, you will be forced to pass the controller service id.

There is a solution to this by using a lookup service. For example, the SQL processors can use DBCPConnectionPoolLookup to dynamically pass a DBCPConnectionPool controller service to the processor.

You could use this way in your bundle.

EDIT:

You should also know that if you reference the controller service without expression language support, and make a template out of your flow, when you will deploy it, the processor will reference the controller service that was just created with your template.

share|improve this answer

edited Mar 26 at 13:37

answered Mar 25 at 15:19

Ben YaakobiBen Yaakobi

5871212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i'm fine with passing the controller service id. I mainy want to avoid having to manually go over each processor to select the appropriate controllerservice each time i deploy a template. To be specific about your answer, this id can not be provided by a scoped variable? if so, allowing expression language for controller service properties seems pretty useless?
  
  – chaixdev
  Mar 26 at 10:38
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @chaixdev It's not useless. You have to pass the controller service id, but you may pass it using the variable registry and expression language.
  
  – Ben Yaakobi
  Mar 26 at 11:02
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @chaixdev also, see the edit. I think it would be more fit to just use it as is since NiFi support referencing controller services within a template.
  
  – Ben Yaakobi
  Mar 26 at 13:38
  
  

  
  
  
  

add a comment | 

Controller Services are not designed to work that way. You can use expression language but as you say, you will be forced to pass the controller service id.

There is a solution to this by using a lookup service. For example, the SQL processors can use DBCPConnectionPoolLookup to dynamically pass a DBCPConnectionPool controller service to the processor.

You could use this way in your bundle.

EDIT:

You should also know that if you reference the controller service without expression language support, and make a template out of your flow, when you will deploy it, the processor will reference the controller service that was just created with your template.

share|improve this answer

edited Mar 26 at 13:37

answered Mar 25 at 15:19

Ben YaakobiBen Yaakobi

5871212 bronze badges

share|improve this answer

edited Mar 26 at 13:37

answered Mar 25 at 15:19

Ben YaakobiBen Yaakobi

5871212 bronze badges

answered Mar 25 at 15:19

Ben YaakobiBen Yaakobi

5871212 bronze badges

answered Mar 25 at 15:19

Ben YaakobiBen Yaakobi

5871212 bronze badges