Madan Jampani | 0583387 | 2016-07-12 23:01:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016-present Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.core; |
| 17 | |
| 18 | import com.google.common.base.MoreObjects; |
| 19 | |
| 20 | /** |
| 21 | * Time provided by a Hybrid Logical Clock described in |
| 22 | * this <a href="http://www.cse.buffalo.edu/tech-reports/2014-04.pdf">paper</a>. |
| 23 | */ |
| 24 | public class HybridLogicalTime { |
| 25 | private final long logicalTime; |
| 26 | private final long logicalCounter; |
| 27 | |
| 28 | public HybridLogicalTime(long logicalTime, long logicalCounter) { |
| 29 | this.logicalTime = logicalTime; |
| 30 | this.logicalCounter = logicalCounter; |
| 31 | } |
| 32 | |
| 33 | /** |
| 34 | * Returns the logical time component of a HLT. |
| 35 | * @return logical time |
| 36 | */ |
| 37 | public long logicalTime() { |
| 38 | return logicalTime; |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Returns the logical counter component of a HLT. |
| 43 | * @return logical counter |
| 44 | */ |
| 45 | public long logicalCounter() { |
| 46 | return logicalCounter; |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Returns the real system time represented by this HLT. |
| 51 | * @return real system time |
| 52 | */ |
| 53 | public long time() { |
| 54 | return (logicalTime >> 16 << 16) | (logicalCounter << 48 >> 48); |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | public String toString() { |
| 59 | return MoreObjects.toStringHelper(getClass()) |
| 60 | .add("logicalTime", logicalTime) |
| 61 | .add("logicalCounter", logicalCounter) |
| 62 | .toString(); |
| 63 | } |
| 64 | } |