| /* |
| * 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.components.PropertyDescriptor; |
| import org.apache.nifi.expression.ExpressionLanguageScope; |
| import org.apache.nifi.flowfile.FlowFile; |
| import org.apache.nifi.flowfile.attributes.CoreAttributes; |
| import org.apache.nifi.processor.AbstractProcessor; |
| import org.apache.nifi.processor.ProcessContext; |
| import org.apache.nifi.processor.ProcessSession; |
| import org.apache.nifi.processor.Relationship; |
| import org.apache.nifi.processor.exception.ProcessException; |
| import org.apache.nifi.processor.io.StreamCallback; |
| import org.apache.nifi.schema.access.SchemaNotFoundException; |
| import org.apache.nifi.serialization.MalformedRecordException; |
| import org.apache.nifi.serialization.RecordReader; |
| import org.apache.nifi.serialization.RecordReaderFactory; |
| import org.apache.nifi.serialization.RecordSetWriter; |
| import org.apache.nifi.serialization.RecordSetWriterFactory; |
| import org.apache.nifi.serialization.WriteResult; |
| import org.apache.nifi.serialization.record.Record; |
| import org.apache.nifi.serialization.record.RecordSchema; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| public abstract class AbstractRecordProcessor extends AbstractProcessor { |
| |
| static final PropertyDescriptor RECORD_READER = new PropertyDescriptor.Builder() |
| .name("record-reader") |
| .displayName("Record Reader") |
| .description("Specifies the Controller Service to use for reading incoming data") |
| .identifiesControllerService(RecordReaderFactory.class) |
| .required(true) |
| .build(); |
| static final PropertyDescriptor RECORD_WRITER = new PropertyDescriptor.Builder() |
| .name("record-writer") |
| .displayName("Record Writer") |
| .description("Specifies the Controller Service to use for writing out the records") |
| .identifiesControllerService(RecordSetWriterFactory.class) |
| .required(true) |
| .build(); |
| |
| static final PropertyDescriptor INCLUDE_ZERO_RECORD_FLOWFILES = new PropertyDescriptor.Builder() |
| .name("include-zero-record-flowfiles") |
| .displayName("Include Zero Record FlowFiles") |
| .description("When converting an incoming FlowFile, if the conversion results in no data, " |
| + "this property specifies whether or not a FlowFile will be sent to the corresponding relationship") |
| .expressionLanguageSupported(ExpressionLanguageScope.NONE) |
| .allowableValues("true", "false") |
| .defaultValue("true") |
| .required(true) |
| .build(); |
| |
| static final Relationship REL_SUCCESS = new Relationship.Builder() |
| .name("success") |
| .description("FlowFiles that are successfully transformed will be routed to this relationship") |
| .build(); |
| static final Relationship REL_FAILURE = new Relationship.Builder() |
| .name("failure") |
| .description("If a FlowFile cannot be transformed from the configured input format to the configured output format, " |
| + "the unchanged FlowFile will be routed to this relationship") |
| .build(); |
| |
| @Override |
| protected List<PropertyDescriptor> getSupportedPropertyDescriptors() { |
| final List<PropertyDescriptor> properties = new ArrayList<>(); |
| properties.add(RECORD_READER); |
| properties.add(RECORD_WRITER); |
| return properties; |
| } |
| |
| @Override |
| public Set<Relationship> getRelationships() { |
| final Set<Relationship> relationships = new HashSet<>(); |
| relationships.add(REL_SUCCESS); |
| relationships.add(REL_FAILURE); |
| return relationships; |
| } |
| |
| @Override |
| public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException { |
| FlowFile flowFile = session.get(); |
| if (flowFile == null) { |
| return; |
| } |
| |
| final RecordReaderFactory readerFactory = context.getProperty(RECORD_READER).asControllerService(RecordReaderFactory.class); |
| final RecordSetWriterFactory writerFactory = context.getProperty(RECORD_WRITER).asControllerService(RecordSetWriterFactory.class); |
| final boolean includeZeroRecordFlowFiles = context.getProperty(INCLUDE_ZERO_RECORD_FLOWFILES).isSet()? context.getProperty(INCLUDE_ZERO_RECORD_FLOWFILES).asBoolean():true; |
| |
| final Map<String, String> attributes = new HashMap<>(); |
| final AtomicInteger recordCount = new AtomicInteger(); |
| |
| final FlowFile original = flowFile; |
| final Map<String, String> originalAttributes = flowFile.getAttributes(); |
| try { |
| flowFile = session.write(flowFile, new StreamCallback() { |
| @Override |
| public void process(final InputStream in, final OutputStream out) throws IOException { |
| |
| try (final RecordReader reader = readerFactory.createRecordReader(originalAttributes, in, original.getSize(), getLogger())) { |
| |
| // Get the first record and process it before we create the Record Writer. We do this so that if the Processor |
| // updates the Record's schema, we can provide an updated schema to the Record Writer. If there are no records, |
| // then we can simply create the Writer with the Reader's schema and begin & end the Record Set. |
| Record firstRecord = reader.nextRecord(); |
| if (firstRecord == null) { |
| final RecordSchema writeSchema = writerFactory.getSchema(originalAttributes, reader.getSchema()); |
| try (final RecordSetWriter writer = writerFactory.createWriter(getLogger(), writeSchema, out, originalAttributes)) { |
| writer.beginRecordSet(); |
| |
| final WriteResult writeResult = writer.finishRecordSet(); |
| attributes.put("record.count", String.valueOf(writeResult.getRecordCount())); |
| attributes.put(CoreAttributes.MIME_TYPE.key(), writer.getMimeType()); |
| attributes.putAll(writeResult.getAttributes()); |
| recordCount.set(writeResult.getRecordCount()); |
| } |
| |
| return; |
| } |
| |
| firstRecord = AbstractRecordProcessor.this.process(firstRecord, original, context, 1L); |
| |
| final RecordSchema writeSchema = writerFactory.getSchema(originalAttributes, firstRecord.getSchema()); |
| try (final RecordSetWriter writer = writerFactory.createWriter(getLogger(), writeSchema, out, originalAttributes)) { |
| writer.beginRecordSet(); |
| |
| writer.write(firstRecord); |
| |
| Record record; |
| long count = 1L; |
| while ((record = reader.nextRecord()) != null) { |
| final Record processed = AbstractRecordProcessor.this.process(record, original, context, ++count); |
| writer.write(processed); |
| } |
| |
| final WriteResult writeResult = writer.finishRecordSet(); |
| attributes.put("record.count", String.valueOf(writeResult.getRecordCount())); |
| attributes.put(CoreAttributes.MIME_TYPE.key(), writer.getMimeType()); |
| attributes.putAll(writeResult.getAttributes()); |
| recordCount.set(writeResult.getRecordCount()); |
| } |
| } catch (final SchemaNotFoundException e) { |
| throw new ProcessException(e.getLocalizedMessage(), e); |
| } catch (final MalformedRecordException e) { |
| throw new ProcessException("Could not parse incoming data", e); |
| } |
| } |
| }); |
| } catch (final Exception e) { |
| getLogger().error("Failed to process {}; will route to failure", new Object[] {flowFile, e}); |
| // Since we are wrapping the exceptions above there should always be a cause |
| // but it's possible it might not have a message. This handles that by logging |
| // the name of the class thrown. |
| Throwable c = e.getCause(); |
| if (c != null) { |
| session.putAttribute(flowFile, "record.error.message", (c.getLocalizedMessage() != null) ? c.getLocalizedMessage() : c.getClass().getCanonicalName() + " Thrown"); |
| } else { |
| session.putAttribute(flowFile, "record.error.message", e.getClass().getCanonicalName() + " Thrown"); |
| } |
| session.transfer(flowFile, REL_FAILURE); |
| return; |
| } |
| |
| flowFile = session.putAllAttributes(flowFile, attributes); |
| if(!includeZeroRecordFlowFiles && recordCount.get() == 0){ |
| session.remove(flowFile); |
| } else { |
| session.transfer(flowFile, REL_SUCCESS); |
| } |
| |
| final int count = recordCount.get(); |
| session.adjustCounter("Records Processed", count, false); |
| getLogger().info("Successfully converted {} records for {}", new Object[] {count, flowFile}); |
| } |
| |
| protected abstract Record process(Record record, FlowFile flowFile, ProcessContext context, long count); |
| } |