I'm not sure if this can be done with out-of-the-box processors but I would do it with a Groovy based InvokeScriptedProcessor with code like this import groovy.json.JsonOutput
import groovy.json.JsonSlurper
class GroovyProcessor implements Processor {
PropertyDescriptor CHUNK_SIZE = new PropertyDescriptor.Builder()
.name("CHUNK_SIZE")
.displayName("Chunk Size")
.description("The chunk size to break up the incoming list of values.")
.required(true)
.defaultValue("5")
.addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
.build()
Relationship REL_SUCCESS = new Relationship.Builder()
.name("success")
.description('FlowFiles that were successfully processed are routed here')
.build()
Relationship REL_FAILURE = new Relationship.Builder()
.name("failure")
.description('FlowFiles that were not successfully processed are routed here')
.build()
ComponentLog log
JsonSlurper jsonSlurper = new JsonSlurper()
JsonOutput jsonOutput = new JsonOutput()
void initialize(ProcessorInitializationContext context) {
log = context.logger
}
Set<Relationship> getRelationships() {
Set<Relationship> relationships = new HashSet<>()
relationships.add(REL_FAILURE)
relationships.add(REL_SUCCESS)
return relationships
}
Collection<ValidationResult> validate(ValidationContext context) {
}
PropertyDescriptor getPropertyDescriptor(String name) {
}
void onPropertyModified(PropertyDescriptor descriptor, String oldValue, String newValue) {
}
List<PropertyDescriptor> getPropertyDescriptors() {
List<PropertyDescriptor> descriptors = new ArrayList<>()
descriptors.add(CHUNK_SIZE)
return Collections.unmodifiableList(descriptors)
}
String getIdentifier() {
}
void onScheduled(ProcessContext context) throws ProcessException {
}
void onUnscheduled(ProcessContext context) throws ProcessException {
}
void onStopped(ProcessContext context) throws ProcessException {
}
void setLogger(ComponentLog logger) {
}
void onTrigger(ProcessContext context, ProcessSessionFactory sessionFactory) throws ProcessException {
ProcessSession session = sessionFactory.createSession()
try {
List<FlowFile> flowFiles = session.get(1)
if (!flowFiles) return
Integer chunkSize = context.getProperty(CHUNK_SIZE).asInteger()
flowFiles.each { FlowFile flowFile ->
Map customAttributes = [ "mime.type": "application/json" ]
Map data = null
session.read(flowFile, { inputStream -> data = jsonSlurper.parse(inputStream) } as InputStreamCallback)
List<List<String>> chunkedObjectIDs = data.objectIDs.collate(chunkSize)
chunkedObjectIDs.each { chunk ->
data = [
"objectIDs": chunk
]
FlowFile newFlowFile = session.create()
newFlowFile = session.write(newFlowFile, { outputStream -> outputStream.write(jsonOutput.toJson(data).getBytes("UTF-8")) } as OutputStreamCallback)
session.putAllAttributes(newFlowFile, customAttributes)
session.transfer(newFlowFile, REL_SUCCESS)
}
session.remove(flowFile)
}
session.commit()
} catch (final Throwable t) {
log.error('{} failed to process due to {}; rolling back session', [this, t] as Object[])
session.rollback(true)
throw t
}
}
}
processor = new GroovyProcessor()
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