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https://issues.apache.org/jira/browse/PLC4X-196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17630916#comment-17630916
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Lukas Ott commented on PLC4X-196:
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This issue has been migrated to https://github.com/apache/plc4x/issues/593
> Apache NiFi integration should allow Expression Language
> --------------------------------------------------------
>
> Key: PLC4X-196
> URL: https://issues.apache.org/jira/browse/PLC4X-196
> Project: Apache PLC4X
> Issue Type: New Feature
> Components: Integration-NiFi
> Affects Versions: 0.7.0
> Reporter: Turker TUNALI
> Priority: Major
> Labels: feature-request
>
> Apache NiFi integration should allow us to use Expression Language for PLC
> connection string and PLC resource address string.
> We sometimes need to get data from 100 different addresses. Current
> processors doesn't allow us to create those strings on the fly. So we need to
> enter them manually or we need utilize NiFi API to create flows
> automatically.
> If those parameters allows us to use expression language, we can read a list
> from csv file or from database and then we can read them in a loop in Apache
> NiFi.
> So it will be very handy feature to dynamically specify the connection string
> and the address string.
> For starting point PutFile processor can be examined. This processor utilizes
> expression language for it's "Directory" parameter.
> [https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/PutFile.java]
> Notable Lines:
> import org.apache.nifi.expression.ExpressionLanguageScope;
> ...
> Define the parameter as expression language supported.
> public static final PropertyDescriptor DIRECTORY = new
> PropertyDescriptor.Builder()
> .name("Directory")
> .description("The directory to which files should be written. You may use
> expression language such as /aa/bb/${path}")
> .required(true)
> .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
> *.expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)*
> .build();
> ...
> And then script can be evaluated in the onTrigger event like
> context.getProperty(DIRECTORY).evaluateAttributeExpressions(flowFile).getValue()
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