Github user justinleet commented on a diff in the pull request:
https://github.com/apache/metron/pull/958#discussion_r173928192
--- Diff:
metron-contrib/metron-performance/src/main/java/org/apache/metron/performance/load/monitor/writers/ConsoleWriter.java
---
@@ -0,0 +1,67 @@
+/**
+ * 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.metron.performance.load.monitor.writers;
+
+import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
+import org.apache.metron.performance.load.monitor.Results;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+import java.util.function.Consumer;
+
+public class ConsoleWriter implements Consumer<Writable> {
+
+ private String getSummary(DescriptiveStatistics stats) {
+ return String.format("Mean: %d, Std Dev: %d", (int)stats.getMean(),
(int)Math.sqrt(stats.getVariance()));
+ }
+
+ @Override
+ public void accept(Writable writable) {
+ List<String> parts = new ArrayList<>();
+ Date date = writable.getDate();
+ for(Results r : writable.getResults()) {
+ Long eps = r.getEps();
+ if(eps != null) {
+ String part = String.format(r.getFormat(), eps);
+ if (r.getHistory().isPresent()) {
+ part += " (" + getSummary(r.getHistory().get()) + ")";
+ }
+ parts.add(part);
+ }
+ }
+ if(date != null) {
+ DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
+ String header = dateFormat.format(date) + " - ";
+ String emptyHeader = "";
+ for (int i = 0; i < header.length(); ++i) {
--- End diff --
Could use `StringUtils.rightPad` to avoid the awkward append blanks loop.
---
