turcsanyip commented on code in PR #6200:
URL: https://github.com/apache/nifi/pull/6200#discussion_r923680558


##########
nifi-nar-bundles/nifi-gcp-bundle/nifi-gcp-processors/src/main/java/org/apache/nifi/processors/gcp/drive/ListGoogleDrive.java:
##########
@@ -0,0 +1,364 @@
+/*
+ * 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.gcp.drive;
+
+import com.google.api.client.http.HttpTransport;
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.json.gson.GsonFactory;
+import com.google.api.services.drive.Drive;
+import com.google.api.services.drive.DriveScopes;
+import com.google.api.services.drive.model.File;
+import com.google.api.services.drive.model.FileList;
+import com.google.auth.http.HttpCredentialsAdapter;
+import com.google.auth.oauth2.GoogleCredentials;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.PrimaryNodeOnly;
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.behavior.TriggerSerially;
+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.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.components.state.Scope;
+import org.apache.nifi.context.PropertyContext;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.gcp.credentials.service.GCPCredentialsService;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processor.util.list.AbstractListProcessor;
+import org.apache.nifi.processor.util.list.ListedEntityTracker;
+import org.apache.nifi.processors.gcp.ProxyAwareTransportFactory;
+import org.apache.nifi.processors.gcp.util.GoogleUtils;
+import org.apache.nifi.proxy.ProxyConfiguration;
+import org.apache.nifi.serialization.record.RecordSchema;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+@PrimaryNodeOnly
+@TriggerSerially
+@Tags({"google", "drive", "storage"})
+@CapabilityDescription("Lists concrete files (shortcuts are ignored) in a 
Google Drive folder. " +
+        "Each listed file may result in one flowfile, the metadata being 
written as flowfile attributes. " +
+        "Or - in case the 'Record Writer' property is set - the entire result 
is written as records to a single flowfile." +
+        "This Processor is designed to run on Primary Node only in a cluster. 
If the primary node changes, the new Primary Node will pick up where the " +
+        "previous node left off without duplicating all of the data.")
+@InputRequirement(Requirement.INPUT_FORBIDDEN)
+@WritesAttributes({@WritesAttribute(attribute = "drive.id", description = "The 
id of the file"),
+        @WritesAttribute(attribute = "filename", description = "The name of 
the file"),
+        @WritesAttribute(attribute = "drive.size", description = "The size of 
the file"),
+        @WritesAttribute(attribute = "drive.timestamp", description = "The 
last modified time or created time (whichever is greater) of the file." +
+                " The reason for this is that the original modified date of a 
file is preserved when uploaded to Google Drive." +
+                " 'Created time' takea the time when the upload occurs. 
However uploaded files can still be modified later."),

Review Comment:
   Typo: takes



##########
nifi-nar-bundles/nifi-gcp-bundle/nifi-gcp-processors/src/main/java/org/apache/nifi/processors/gcp/drive/ListGoogleDrive.java:
##########
@@ -0,0 +1,364 @@
+/*
+ * 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.gcp.drive;
+
+import com.google.api.client.http.HttpTransport;
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.json.gson.GsonFactory;
+import com.google.api.services.drive.Drive;
+import com.google.api.services.drive.DriveScopes;
+import com.google.api.services.drive.model.File;
+import com.google.api.services.drive.model.FileList;
+import com.google.auth.http.HttpCredentialsAdapter;
+import com.google.auth.oauth2.GoogleCredentials;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.PrimaryNodeOnly;
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.behavior.TriggerSerially;
+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.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.components.state.Scope;
+import org.apache.nifi.context.PropertyContext;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.gcp.credentials.service.GCPCredentialsService;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processor.util.list.AbstractListProcessor;
+import org.apache.nifi.processor.util.list.ListedEntityTracker;
+import org.apache.nifi.processors.gcp.ProxyAwareTransportFactory;
+import org.apache.nifi.processors.gcp.util.GoogleUtils;
+import org.apache.nifi.proxy.ProxyConfiguration;
+import org.apache.nifi.serialization.record.RecordSchema;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+@PrimaryNodeOnly
+@TriggerSerially
+@Tags({"google", "drive", "storage"})
+@CapabilityDescription("Lists concrete files (shortcuts are ignored) in a 
Google Drive folder. " +
+        "Each listed file may result in one flowfile, the metadata being 
written as flowfile attributes. " +
+        "Or - in case the 'Record Writer' property is set - the entire result 
is written as records to a single flowfile." +
+        "This Processor is designed to run on Primary Node only in a cluster. 
If the primary node changes, the new Primary Node will pick up where the " +
+        "previous node left off without duplicating all of the data.")
+@InputRequirement(Requirement.INPUT_FORBIDDEN)
+@WritesAttributes({@WritesAttribute(attribute = "drive.id", description = "The 
id of the file"),
+        @WritesAttribute(attribute = "filename", description = "The name of 
the file"),
+        @WritesAttribute(attribute = "drive.size", description = "The size of 
the file"),
+        @WritesAttribute(attribute = "drive.timestamp", description = "The 
last modified time or created time (whichever is greater) of the file." +
+                " The reason for this is that the original modified date of a 
file is preserved when uploaded to Google Drive." +
+                " 'Created time' takea the time when the upload occurs. 
However uploaded files can still be modified later."),
+        @WritesAttribute(attribute = "mime.type", description = "MimeType of 
the file")})
+@Stateful(scopes = {Scope.CLUSTER}, description = "The processor stores 
necessary data to be able to keep track what files have been listed already." +
+        " What exactly needs to be stored depends on the 'Listing Strategy'." +
+        " State is stored across the cluster so that this Processor can be run 
on Primary Node only and if a new Primary Node is selected, the new node can 
pick up" +
+        " where the previous node left off, without duplicating the data.")
+public class ListGoogleDrive extends 
AbstractListProcessor<GoogleDriveFileInfo> {
+    private static final String APPLICATION_NAME = "NiFi";
+    private static final JsonFactory JSON_FACTORY = 
GsonFactory.getDefaultInstance();
+
+    private volatile HttpTransport httpTransport;
+
+    public static final PropertyDescriptor FOLDER_ID = new 
PropertyDescriptor.Builder()
+            .name("folder-id")
+            .displayName("Folder ID")
+            .description("The ID of the folder from which to pull list of 
files. Needs to be shared with a Service Account." +
+                    " WARNING: Unauthorized access to the folder is treated as 
if the folder was empty." +
+                    " This results in the processor not creating result 
flowfiles. No additional error message is provided.")
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            
.expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY)
+            .required(true)
+            .build();
+
+    public static final PropertyDescriptor RECURSIVE_SEARCH = new 
PropertyDescriptor.Builder()
+            .name("recursive-search")
+            .displayName("Search Recursively")
+            .description("When 'true', will include list of files from 
concrete sub-folders (ignores shortcuts)." +
+                    " Otherwise, will return only files that have the defined 
'Folder ID' as their parent directly." +
+                    " WARNING: The listing may fail if there are too many 
sub-folders (500+).")
+            .required(true)
+            .defaultValue("true")
+            .allowableValues("true", "false")
+            .build();
+
+    public static final PropertyDescriptor MIN_AGE = new 
PropertyDescriptor.Builder()
+            .name("min-age")
+            .displayName("Minimum File Age")
+            .description("The minimum age a file must be in order to be 
considered; any files younger than this will be ignored")

Review Comment:
   Typo: no period at the end of the sentence.



##########
nifi-nar-bundles/nifi-gcp-bundle/nifi-gcp-processors/src/main/java/org/apache/nifi/processors/gcp/drive/ListGoogleDrive.java:
##########
@@ -0,0 +1,364 @@
+/*
+ * 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.gcp.drive;
+
+import com.google.api.client.http.HttpTransport;
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.json.gson.GsonFactory;
+import com.google.api.services.drive.Drive;
+import com.google.api.services.drive.DriveScopes;
+import com.google.api.services.drive.model.File;
+import com.google.api.services.drive.model.FileList;
+import com.google.auth.http.HttpCredentialsAdapter;
+import com.google.auth.oauth2.GoogleCredentials;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.PrimaryNodeOnly;
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.behavior.TriggerSerially;
+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.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.components.state.Scope;
+import org.apache.nifi.context.PropertyContext;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.gcp.credentials.service.GCPCredentialsService;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processor.util.list.AbstractListProcessor;
+import org.apache.nifi.processor.util.list.ListedEntityTracker;
+import org.apache.nifi.processors.gcp.ProxyAwareTransportFactory;
+import org.apache.nifi.processors.gcp.util.GoogleUtils;
+import org.apache.nifi.proxy.ProxyConfiguration;
+import org.apache.nifi.serialization.record.RecordSchema;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+@PrimaryNodeOnly
+@TriggerSerially
+@Tags({"google", "drive", "storage"})
+@CapabilityDescription("Lists concrete files (shortcuts are ignored) in a 
Google Drive folder. " +
+        "Each listed file may result in one flowfile, the metadata being 
written as flowfile attributes. " +
+        "Or - in case the 'Record Writer' property is set - the entire result 
is written as records to a single flowfile." +
+        "This Processor is designed to run on Primary Node only in a cluster. 
If the primary node changes, the new Primary Node will pick up where the " +

Review Comment:
   Typo: no space before "This..."



##########
nifi-nar-bundles/nifi-gcp-bundle/nifi-gcp-processors/src/main/java/org/apache/nifi/processors/gcp/drive/ListGoogleDrive.java:
##########
@@ -0,0 +1,364 @@
+/*
+ * 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.gcp.drive;
+
+import com.google.api.client.http.HttpTransport;
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.json.gson.GsonFactory;
+import com.google.api.services.drive.Drive;
+import com.google.api.services.drive.DriveScopes;
+import com.google.api.services.drive.model.File;
+import com.google.api.services.drive.model.FileList;
+import com.google.auth.http.HttpCredentialsAdapter;
+import com.google.auth.oauth2.GoogleCredentials;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.PrimaryNodeOnly;
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.behavior.TriggerSerially;
+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.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.components.state.Scope;
+import org.apache.nifi.context.PropertyContext;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.gcp.credentials.service.GCPCredentialsService;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processor.util.list.AbstractListProcessor;
+import org.apache.nifi.processor.util.list.ListedEntityTracker;
+import org.apache.nifi.processors.gcp.ProxyAwareTransportFactory;
+import org.apache.nifi.processors.gcp.util.GoogleUtils;
+import org.apache.nifi.proxy.ProxyConfiguration;
+import org.apache.nifi.serialization.record.RecordSchema;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+@PrimaryNodeOnly
+@TriggerSerially
+@Tags({"google", "drive", "storage"})
+@CapabilityDescription("Lists concrete files (shortcuts are ignored) in a 
Google Drive folder. " +
+        "Each listed file may result in one flowfile, the metadata being 
written as flowfile attributes. " +
+        "Or - in case the 'Record Writer' property is set - the entire result 
is written as records to a single flowfile." +
+        "This Processor is designed to run on Primary Node only in a cluster. 
If the primary node changes, the new Primary Node will pick up where the " +
+        "previous node left off without duplicating all of the data.")
+@InputRequirement(Requirement.INPUT_FORBIDDEN)
+@WritesAttributes({@WritesAttribute(attribute = "drive.id", description = "The 
id of the file"),
+        @WritesAttribute(attribute = "filename", description = "The name of 
the file"),
+        @WritesAttribute(attribute = "drive.size", description = "The size of 
the file"),
+        @WritesAttribute(attribute = "drive.timestamp", description = "The 
last modified time or created time (whichever is greater) of the file." +
+                " The reason for this is that the original modified date of a 
file is preserved when uploaded to Google Drive." +
+                " 'Created time' takea the time when the upload occurs. 
However uploaded files can still be modified later."),
+        @WritesAttribute(attribute = "mime.type", description = "MimeType of 
the file")})

Review Comment:
   Please use period at the end of all attribute descriptions. As in case of 
the description of `drive.timestamp`.



##########
nifi-nar-bundles/nifi-gcp-bundle/nifi-gcp-processors/src/main/java/org/apache/nifi/processors/gcp/drive/ListGoogleDrive.java:
##########
@@ -0,0 +1,364 @@
+/*
+ * 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.gcp.drive;
+
+import com.google.api.client.http.HttpTransport;
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.json.gson.GsonFactory;
+import com.google.api.services.drive.Drive;
+import com.google.api.services.drive.DriveScopes;
+import com.google.api.services.drive.model.File;
+import com.google.api.services.drive.model.FileList;
+import com.google.auth.http.HttpCredentialsAdapter;
+import com.google.auth.oauth2.GoogleCredentials;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.PrimaryNodeOnly;
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.behavior.TriggerSerially;
+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.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.components.state.Scope;
+import org.apache.nifi.context.PropertyContext;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.gcp.credentials.service.GCPCredentialsService;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processor.util.list.AbstractListProcessor;
+import org.apache.nifi.processor.util.list.ListedEntityTracker;
+import org.apache.nifi.processors.gcp.ProxyAwareTransportFactory;
+import org.apache.nifi.processors.gcp.util.GoogleUtils;
+import org.apache.nifi.proxy.ProxyConfiguration;
+import org.apache.nifi.serialization.record.RecordSchema;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+@PrimaryNodeOnly
+@TriggerSerially
+@Tags({"google", "drive", "storage"})
+@CapabilityDescription("Lists concrete files (shortcuts are ignored) in a 
Google Drive folder. " +
+        "Each listed file may result in one flowfile, the metadata being 
written as flowfile attributes. " +
+        "Or - in case the 'Record Writer' property is set - the entire result 
is written as records to a single flowfile." +
+        "This Processor is designed to run on Primary Node only in a cluster. 
If the primary node changes, the new Primary Node will pick up where the " +
+        "previous node left off without duplicating all of the data.")
+@InputRequirement(Requirement.INPUT_FORBIDDEN)
+@WritesAttributes({@WritesAttribute(attribute = "drive.id", description = "The 
id of the file"),
+        @WritesAttribute(attribute = "filename", description = "The name of 
the file"),
+        @WritesAttribute(attribute = "drive.size", description = "The size of 
the file"),
+        @WritesAttribute(attribute = "drive.timestamp", description = "The 
last modified time or created time (whichever is greater) of the file." +
+                " The reason for this is that the original modified date of a 
file is preserved when uploaded to Google Drive." +
+                " 'Created time' takea the time when the upload occurs. 
However uploaded files can still be modified later."),
+        @WritesAttribute(attribute = "mime.type", description = "MimeType of 
the file")})
+@Stateful(scopes = {Scope.CLUSTER}, description = "The processor stores 
necessary data to be able to keep track what files have been listed already." +
+        " What exactly needs to be stored depends on the 'Listing Strategy'." +
+        " State is stored across the cluster so that this Processor can be run 
on Primary Node only and if a new Primary Node is selected, the new node can 
pick up" +
+        " where the previous node left off, without duplicating the data.")
+public class ListGoogleDrive extends 
AbstractListProcessor<GoogleDriveFileInfo> {
+    private static final String APPLICATION_NAME = "NiFi";
+    private static final JsonFactory JSON_FACTORY = 
GsonFactory.getDefaultInstance();
+
+    private volatile HttpTransport httpTransport;
+
+    public static final PropertyDescriptor FOLDER_ID = new 
PropertyDescriptor.Builder()
+            .name("folder-id")
+            .displayName("Folder ID")
+            .description("The ID of the folder from which to pull list of 
files. Needs to be shared with a Service Account." +
+                    " WARNING: Unauthorized access to the folder is treated as 
if the folder was empty." +
+                    " This results in the processor not creating result 
flowfiles. No additional error message is provided.")
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            
.expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY)
+            .required(true)
+            .build();
+
+    public static final PropertyDescriptor RECURSIVE_SEARCH = new 
PropertyDescriptor.Builder()
+            .name("recursive-search")
+            .displayName("Search Recursively")
+            .description("When 'true', will include list of files from 
concrete sub-folders (ignores shortcuts)." +
+                    " Otherwise, will return only files that have the defined 
'Folder ID' as their parent directly." +
+                    " WARNING: The listing may fail if there are too many 
sub-folders (500+).")
+            .required(true)
+            .defaultValue("true")
+            .allowableValues("true", "false")
+            .build();
+
+    public static final PropertyDescriptor MIN_AGE = new 
PropertyDescriptor.Builder()
+            .name("min-age")
+            .displayName("Minimum File Age")
+            .description("The minimum age a file must be in order to be 
considered; any files younger than this will be ignored")
+            .required(true)
+            .addValidator(StandardValidators.TIME_PERIOD_VALIDATOR)
+            .defaultValue("0 sec")
+            .build();
+
+    public static final PropertyDescriptor LISTING_STRATEGY = new 
PropertyDescriptor.Builder()
+            .fromPropertyDescriptor(AbstractListProcessor.LISTING_STRATEGY)
+            .allowableValues(BY_TIMESTAMPS, BY_ENTITIES, BY_TIME_WINDOW, 
NO_TRACKING)
+            .build();
+
+    public static final PropertyDescriptor TRACKING_STATE_CACHE = new 
PropertyDescriptor.Builder()
+            .fromPropertyDescriptor(ListedEntityTracker.TRACKING_STATE_CACHE)
+            .dependsOn(LISTING_STRATEGY, BY_ENTITIES)
+            .build();
+
+    public static final PropertyDescriptor TRACKING_TIME_WINDOW = new 
PropertyDescriptor.Builder()
+            .fromPropertyDescriptor(ListedEntityTracker.TRACKING_TIME_WINDOW)
+            .dependsOn(LISTING_STRATEGY, BY_ENTITIES)
+            .build();
+
+    public static final PropertyDescriptor INITIAL_LISTING_TARGET = new 
PropertyDescriptor.Builder()
+            .fromPropertyDescriptor(ListedEntityTracker.INITIAL_LISTING_TARGET)
+            .dependsOn(LISTING_STRATEGY, BY_ENTITIES)
+            .build();
+
+    private static final List<PropertyDescriptor> PROPERTIES = 
Collections.unmodifiableList(Arrays.asList(
+            GoogleUtils.GCP_CREDENTIALS_PROVIDER_SERVICE,
+            FOLDER_ID,
+            RECURSIVE_SEARCH,
+            MIN_AGE,
+            LISTING_STRATEGY,
+            RECORD_WRITER,
+            TRACKING_STATE_CACHE,
+            TRACKING_TIME_WINDOW,
+            INITIAL_LISTING_TARGET,

Review Comment:
   I'd suggest moving these properties up, just after the `LISTING_STRATEGY` 
which they are depend on.



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