Pier Luigi | 09220c2 | 2017-09-14 22:00:30 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017-present Open Networking Foundation |
| 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 | |
| 17 | package org.onosproject.net.behaviour.trafficcontrol; |
| 18 | |
| 19 | import com.google.common.annotations.Beta; |
| 20 | |
| 21 | /** |
| 22 | * Generic abstraction for a token bucket which can mark and/or discard |
| 23 | * traffic. Each token bucket in ONOS is made up of a set of attributes which |
| 24 | * identifies the type. |
| 25 | */ |
| 26 | @Beta |
| 27 | public interface TokenBucket { |
| 28 | |
| 29 | /** |
| 30 | * Upper bound for DSCP. |
| 31 | */ |
| 32 | short MAX_DSCP = 255; |
| 33 | /** |
| 34 | * Lower bound for DSCP. |
| 35 | */ |
| 36 | short MIN_DSCP = 0; |
| 37 | |
| 38 | /** |
| 39 | * Action applied to the exceeding traffic. |
| 40 | * Action depends on the tocken bucket type |
| 41 | */ |
| 42 | enum Action { |
| 43 | /** |
| 44 | * Drop action. |
| 45 | */ |
| 46 | DROP, |
| 47 | /** |
| 48 | * Marking increases DSCP drop precedence. |
| 49 | */ |
| 50 | DSCP_PRECEDENCE, |
| 51 | /** |
| 52 | * Marking sets DSCP class. |
| 53 | */ |
| 54 | DSCP_CLASS, |
| 55 | /** |
| 56 | * Marking sets Drop Elegible Indicator. |
| 57 | */ |
| 58 | DEI |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Rate of traffic subject to the SLAs |
| 63 | * specified for this token bucket. |
| 64 | * |
| 65 | * @return the rate value |
| 66 | */ |
| 67 | long rate(); |
| 68 | |
| 69 | /** |
| 70 | * Maximum burst size subject to the SLAs |
| 71 | * specified for this token bucket. |
| 72 | * |
| 73 | * @return the burst size in bytes |
| 74 | */ |
| 75 | long burstSize(); |
| 76 | |
| 77 | /** |
| 78 | * Action used by this token bucket |
| 79 | * for the exceeding traffic. |
| 80 | * |
| 81 | * @return the type of action |
| 82 | */ |
| 83 | Action action(); |
| 84 | |
| 85 | /** |
| 86 | * Dscp value, it meaning depends on the used marking. |
| 87 | * |
| 88 | * @return the dscp value for this token bucket |
| 89 | */ |
| 90 | short dscp(); |
| 91 | |
| 92 | /** |
| 93 | * Stats which reports how many packets have been |
| 94 | * processed so far. |
| 95 | * |
| 96 | * Availability of this information depends on the |
| 97 | * technology used for the implementation of the policer. |
| 98 | * |
| 99 | * @return the processed packets |
| 100 | */ |
| 101 | long processedPackets(); |
| 102 | |
| 103 | /** |
| 104 | * Stats which reports how many bytes have been |
| 105 | * processed so far. |
| 106 | * |
| 107 | * Availability of this information depends on the |
| 108 | * technology used for the implementation of the policer. |
| 109 | * |
| 110 | * @return the processed bytes |
| 111 | */ |
| 112 | long processedBytes(); |
| 113 | |
| 114 | /** |
| 115 | * Token bucket builder. |
| 116 | */ |
| 117 | interface Builder { |
| 118 | |
| 119 | /** |
| 120 | * Assigns the rate to this token bucket. |
| 121 | * |
| 122 | * @param rate a rate value |
| 123 | * @return this |
| 124 | */ |
| 125 | Builder withRate(long rate); |
| 126 | |
| 127 | /** |
| 128 | * Assigns the burst size to this token bucket. |
| 129 | * Default to 2 * 1500 bytes. |
| 130 | * |
| 131 | * @param burstSize a burst size |
| 132 | * @return this |
| 133 | */ |
| 134 | Builder withBurstSize(long burstSize); |
| 135 | |
| 136 | /** |
| 137 | * Assigns the action to this token bucket. |
| 138 | * <p> |
| 139 | * Note: mandatory setter for this builder |
| 140 | * </p> |
| 141 | * @param action an action |
| 142 | * @return this |
| 143 | */ |
| 144 | Builder withAction(Action action); |
| 145 | |
| 146 | /** |
| 147 | * Assigns the dscp value to this token bucket. |
| 148 | * |
| 149 | * @param dscp a dscp value |
| 150 | * @return this |
| 151 | */ |
| 152 | Builder withDscp(short dscp); |
| 153 | |
| 154 | /** |
| 155 | * Builds the token bucket based on the specified |
| 156 | * parameters when possible. |
| 157 | * |
| 158 | * @return a token bucket |
| 159 | */ |
| 160 | TokenBucket build(); |
| 161 | |
| 162 | } |
| 163 | } |