[GitHub] [incubator-openwhisk] chetanmeh commented on a change in pull request #4497: Use Instant with milli second precision

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chetanmeh commented on a change in pull request #4497: Use Instant with milli second precision
URL: https://github.com/apache/incubator-openwhisk/pull/4497#discussion_r288866684
 
 

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 File path: common/scala/src/main/scala/org/apache/openwhisk/common/WhiskInstants.scala
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 @@ -0,0 +1,39 @@
+/*
+ * 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.openwhisk.common
+
+import java.time.Instant
+import java.time.temporal.ChronoUnit
+
+/**
+ * JDK 11 Instant uses nano second precision by default. However OpenWhisk usage of Instant in
+ * many cases involves storing the timestamp in database which uses milli second precision.
+ *
+ * To ensure consistency below utilities can be used to truncate the Instant to millis
+ */
+trait WhiskInstants {
+
+  implicit class InstantImplicits(i: Instant) {
+    def inMills = i.truncatedTo(ChronoUnit.MILLIS)
 
 Review comment:
   @jvz Used the approach suggested by you to truncate the `Instant`. Though we can possibly optimize it by having a custom `Clock` which uses [jdk 8 approach][1]
   
   [1]: https://github.com/openjdk/jdk/blob/jdk8-b120/jdk/src/share/classes/java/time/Clock.java#L470

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