[jira] [Commented] (NIFI-4982) Add a DistributedMapCacheLookupService

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-4982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16510691#comment-16510691 ] 

ASF GitHub Bot commented on NIFI-4982:
--------------------------------------

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

    https://github.com/apache/nifi/pull/2558#discussion_r194971580
  
    --- Diff: nifi-nar-bundles/nifi-standard-services/nifi-lookup-services-bundle/nifi-lookup-services/src/main/java/org/apache/nifi/lookup/DistributedMapCacheLookupService.java ---
    @@ -0,0 +1,127 @@
    +/*
    + * 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.lookup;
    +
    +import java.io.IOException;
    +import java.io.OutputStream;
    +import java.nio.charset.StandardCharsets;
    +import java.util.ArrayList;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Optional;
    +import java.util.Set;
    +import java.util.stream.Collectors;
    +import java.util.stream.Stream;
    +
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnEnabled;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.components.Validator;
    +import org.apache.nifi.controller.AbstractControllerService;
    +import org.apache.nifi.controller.ConfigurationContext;
    +import org.apache.nifi.distributed.cache.client.Deserializer;
    +import org.apache.nifi.distributed.cache.client.DistributedMapCacheClient;
    +import org.apache.nifi.distributed.cache.client.Serializer;
    +import org.apache.nifi.distributed.cache.client.exception.DeserializationException;
    +import org.apache.nifi.distributed.cache.client.exception.SerializationException;
    +
    +@Tags({"lookup", "enrich", "key", "value", "map", "cache", "distributed"})
    +@CapabilityDescription("Allows to choose a distributed map cache client to retrieve the value associated to a key. "
    +    + "The coordinates that are passed to the lookup must contain the key 'key'.")
    +public class DistributedMapCacheLookupService extends AbstractControllerService implements StringLookupService {
    +    private static final String KEY = "key";
    --- End diff --
    
    LookupAttribute processor loops through dynamic properties to fetch multiple keys, but it only supports single coordinates.
    
    |Dynamic property name|Dynamic property value|Result|
    |------------------------|------------------------|------|
    |resultA|`${attributeAKey}`|Lookup cache with `attributeAKey` FlowFile attribute value and put it to `resultA` attribute|
    |resultB|`${attributeBKey}`|Lookup cache with `attributeBKey` FlowFile attribute value and put it to `resultB` attribute|
    
    Since this LookupService implements StringLookupService, I think it is correct to require a "key" to fetch the String.


> Add a DistributedMapCacheLookupService
> --------------------------------------
>
>                 Key: NIFI-4982
>                 URL: https://issues.apache.org/jira/browse/NIFI-4982
>             Project: Apache NiFi
>          Issue Type: New Feature
>          Components: Extensions
>            Reporter: Pierre Villard
>            Assignee: Pierre Villard
>            Priority: Major
>         Attachments: distributedMapCacheLookup.xml
>
>
> Add a new lookup controller service that takes a Distributed Map Cache client to lookup for values based on a key. This allows users to leverage the internal Disitributed Map Cache server and/or the Redis to perform lookup access (with LookupRecord processor for instance).
> Attached is a template to test the PR.



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