| /* |
| * 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.cassandra.utils; |
| |
| import static org.junit.Assert.*; |
| |
| import org.junit.Test; |
| |
| public class NanoTimeToCurrentTimeMillisTest |
| { |
| @Test |
| public void testTimestampOrdering() throws Exception |
| { |
| long nowNanos = System.nanoTime(); |
| long now = System.currentTimeMillis(); |
| long lastConverted = 0; |
| for (long ii = 0; ii < 10000000; ii++) |
| { |
| now = Math.max(now, System.currentTimeMillis()); |
| if (ii % 10000 == 0) |
| { |
| synchronized (NanoTimeToCurrentTimeMillis.TIMESTAMP_UPDATE) |
| { |
| NanoTimeToCurrentTimeMillis.TIMESTAMP_UPDATE.notify(); |
| } |
| Thread.sleep(1); |
| } |
| nowNanos = Math.max(now, System.nanoTime()); |
| long convertedNow = NanoTimeToCurrentTimeMillis.convert(nowNanos); |
| assertTrue("convertedNow = " + convertedNow + " lastConverted = " + lastConverted + " in iteration " + ii, convertedNow >= (lastConverted - 1)); |
| lastConverted = convertedNow; |
| //Seems to be off by as much as two milliseconds sadly |
| assertTrue("now = " + now + " convertedNow = " + convertedNow + " in iteration " + ii, (now - 2) <= convertedNow); |
| |
| } |
| } |
| } |