[GitHub] nifi pull request #1958: NIFI-4060: Initial implementation of MergeRecord

[markap14 <gi...@git.apache.org>]

Github user markap14 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1958#discussion_r125677757
  
    --- Diff: nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/MergeRecord.java ---
    @@ -0,0 +1,350 @@
    +/*
    + * 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 java.io.IOException;
    +import java.io.InputStream;
    +import java.util.ArrayList;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Optional;
    +import java.util.Set;
    +import java.util.concurrent.TimeUnit;
    +import java.util.concurrent.atomic.AtomicReference;
    +
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
    +import org.apache.nifi.annotation.behavior.ReadsAttribute;
    +import org.apache.nifi.annotation.behavior.ReadsAttributes;
    +import org.apache.nifi.annotation.behavior.SideEffectFree;
    +import org.apache.nifi.annotation.behavior.TriggerWhenEmpty;
    +import org.apache.nifi.annotation.behavior.WritesAttribute;
    +import org.apache.nifi.annotation.behavior.WritesAttributes;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.SeeAlso;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnStopped;
    +import org.apache.nifi.avro.AvroTypeUtil;
    +import org.apache.nifi.components.AllowableValue;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.flowfile.attributes.FragmentAttributes;
    +import org.apache.nifi.processor.AbstractSessionFactoryProcessor;
    +import org.apache.nifi.processor.DataUnit;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.ProcessSessionFactory;
    +import org.apache.nifi.processor.Relationship;
    +import org.apache.nifi.processor.exception.ProcessException;
    +import org.apache.nifi.processor.util.FlowFileFilters;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import org.apache.nifi.processors.standard.merge.AttributeStrategyUtil;
    +import org.apache.nifi.processors.standard.merge.RecordBinManager;
    +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.RecordSetWriterFactory;
    +import org.apache.nifi.serialization.record.RecordSchema;
    +
    +
    +@SideEffectFree
    +@TriggerWhenEmpty
    +@InputRequirement(Requirement.INPUT_REQUIRED)
    +@Tags({"merge", "record", "content", "correlation", "stream", "event"})
    +@CapabilityDescription("This Processor merges together multiple record-oriented FlowFiles into a single FlowFile that contains all of the Records of the input FlowFiles. "
    +    + "This Processor works by creating 'bins' and then adding FlowFiles to these bins until they are full. Once a bin is full, all of the FlowFiles will be combined into "
    +    + "a single output FlowFile, and that FlowFile will be routed to the 'merged' Relationship. A bin will consist of potentially many 'like FlowFiles'. In order for two "
    +    + "FlowFiles to be considered 'like FlowFiles', they must have the same Schema (as identified by the Record Reader) and, if the <Correlation Attribute Name> property "
    +    + "is set, the same value for the specified attribute. See Processor Usage and Additional Details for more information.")
    +@ReadsAttributes({
    +    @ReadsAttribute(attribute = "fragment.identifier", description = "Applicable only if the <Merge Strategy> property is set to Defragment. "
    +        + "All FlowFiles with the same value for this attribute will be bundled together."),
    +    @ReadsAttribute(attribute = "fragment.count", description = "Applicable only if the <Merge Strategy> property is set to Defragment. This "
    +        + "attribute must be present on all FlowFiles with the same value for the fragment.identifier attribute. All FlowFiles in the same "
    +        + "bundle must have the same value for this attribute. The value of this attribute indicates how many FlowFiles should be expected "
    +        + "in the given bundle."),
    +})
    +@WritesAttributes({
    +    @WritesAttribute(attribute = "record.count", description = "The merged FlowFile will have a 'record.count' attribute indicating the number of records "
    +        + "that were written to the FlowFile."),
    +    @WritesAttribute(attribute = "mime.type", description = "The MIME Type indicated by the Record Writer"),
    --- End diff --
    
    Line 325 of RecordBin adds it: https://github.com/apache/nifi/pull/1958/files#diff-62d8eee2f28a32e8414b634402285e12R325


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