Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2123#discussion_r138080593
--- Diff:
nifi-nar-bundles/nifi-standard-services/nifi-mongodb-services-bundle/nifi-mongodb-services/src/main/java/org/apache/nifi/mongodb/MongoDBLookupService.java
---
@@ -0,0 +1,116 @@
+/*
+ * 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.mongodb;
+
+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.controller.ConfigurationContext;
+import org.apache.nifi.controller.ControllerServiceInitializationContext;
+import org.apache.nifi.lookup.LookupFailureException;
+import org.apache.nifi.lookup.LookupService;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.reporting.InitializationException;
+import org.bson.Document;
+import org.codehaus.jackson.map.ObjectMapper;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+
+
+@Tags({"mongo", "mongodb", "lookup", "record"})
+@CapabilityDescription(
+ "Provides lookup service functionality through a configured connection
to MongoDB. " +
+ "One or more keys must defined in LookupRecord in order for it to run.
Each value " +
+ "must correspond to a full field value in the Mongo collection, as
this does not support " +
+ "regular expressions and other features."
+)
+public class MongoDBLookupService extends MongoDBControllerService
implements LookupService {
+
+ public static final PropertyDescriptor LOOKUP_KEY = new
PropertyDescriptor.Builder()
+ .name("mongo-lookup-key")
+ .displayName("The key from the result to return")
+ .addValidator(StandardValidators.NON_BLANK_VALIDATOR)
+ .required(true)
+ .defaultValue("somevalue")
+ .build();
+
+ private ObjectMapper mapper;
+ private String lookupKey;
+
+ private static final List<PropertyDescriptor> lookupDescriptors;
+
+ static {
+ lookupDescriptors = new ArrayList<>();
+ lookupDescriptors.addAll(descriptors);
+ lookupDescriptors.add(LOOKUP_KEY);
+ }
+
+ @Override
+ public Optional lookup(Map coordinates) throws LookupFailureException {
--- End diff --
This method should return `Optional<Object>` and take `Map<String, String>`
as its argument
---
