Github user pvillard31 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1328#discussion_r95008584
--- Diff:
nifi-nar-bundles/nifi-stateful-analysis-bundle/nifi-stateful-analysis-processors/src/main/java/org/apache/nifi/processors/stateful/analysis/AttributeRollingWindow.java
---
@@ -0,0 +1,325 @@
+/*
+ * 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.stateful.analysis;
+
+import org.apache.nifi.annotation.behavior.InputRequirement;
+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.state.Scope;
+import org.apache.nifi.components.state.StateManager;
+import org.apache.nifi.components.state.StateMap;
+import org.apache.nifi.flowfile.FlowFile;
+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.util.StandardValidators;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+import static
org.apache.nifi.processors.stateful.analysis.AttributeRollingWindow.ROLLING_WINDOW_COUNT_KEY;
+import static
org.apache.nifi.processors.stateful.analysis.AttributeRollingWindow.ROLLING_WINDOW_VALUE_KEY;
+
+@TriggerSerially
+@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
+@Tags({"Attribute Expression Language", "state", "data science",
"rolling", "window"})
+@CapabilityDescription("Track a Rolling Window based on evaluating an
Expression Language expression on each FlowFile and add that value to the
processor's state. Each FlowFile will be emitted " +
+ "with the count of FlowFiles and total aggregate value of values
processed in the current time window.")
+@WritesAttributes({
+ @WritesAttribute(attribute = ROLLING_WINDOW_VALUE_KEY, description
= "The rolling window value (sum of all the values stored)."),
+ @WritesAttribute(attribute = ROLLING_WINDOW_COUNT_KEY, description
= "The count of the number of FlowFiles seen in the rolling window.")
+})
+@Stateful(scopes = {Scope.LOCAL}, description = "Store the values backing
the rolling window. This includes storing the individual values and their
time-stamps or the batches of values and their " +
+ "counts.")
+public class AttributeRollingWindow extends AbstractProcessor {
+
+ public static final String COUNT_KEY = "count";
+ public static final String ROLLING_WINDOW_VALUE_KEY =
"rolling_window_value";
+ public static final String ROLLING_WINDOW_COUNT_KEY =
"rolling_window_count";
+
+ public static final String CURRENT_MICRO_BATCH_STATE_TS_KEY =
"start_curr_batch_ts";
+ public static final String BATCH_APPEND_KEY = "_batch";
+ public static final String COUNT_APPEND_KEY = "_count";
+ public static final int COUNT_APPEND_KEY_LENGTH = 6;
+
+ static final PropertyDescriptor VALUE_TO_TRACK = new
PropertyDescriptor.Builder()
+ .name("Value to track")
--- End diff --
Use .displayName() in addition to .name()?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
