| /* |
| * Copyright 2014-present Open Networking Laboratory |
| * |
| * Licensed 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.onosproject.net.statistic; |
| |
| import com.google.common.base.MoreObjects; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| /** |
| * Implementation of a load. |
| */ |
| public class DefaultLoad implements Load { |
| |
| private final boolean isValid; |
| private final long current; |
| private final long previous; |
| private final long time; |
| private final long interval; |
| |
| /** |
| * Indicates the flow statistics poll interval in seconds. |
| */ |
| private static long pollInterval = 10; |
| |
| /** |
| * Creates an invalid load. |
| */ |
| public DefaultLoad() { |
| this.isValid = false; |
| this.time = System.currentTimeMillis(); |
| this.current = -1; |
| this.previous = -1; |
| this.interval = pollInterval; |
| } |
| |
| /** |
| * Creates a load value from the parameters. |
| * |
| * @param current the current value |
| * @param previous the previous value |
| */ |
| public DefaultLoad(long current, long previous) { |
| this(current, previous, pollInterval); |
| } |
| |
| /** |
| * Creates a load value from the parameters. |
| * |
| * @param current the current value |
| * @param previous the previous value |
| * @param interval poll interval for this load |
| */ |
| public DefaultLoad(long current, long previous, long interval) { |
| checkArgument(interval > 0, "Interval must be greater than 0"); |
| this.current = current; |
| this.previous = previous; |
| this.time = System.currentTimeMillis(); |
| this.isValid = true; |
| this.interval = interval; |
| } |
| |
| /** |
| * Sets the poll interval in seconds. Used solely for the purpose of |
| * computing the load. |
| * |
| * @param newPollInterval poll interval duration in seconds |
| */ |
| public static void setPollInterval(long newPollInterval) { |
| pollInterval = newPollInterval; |
| } |
| |
| @Override |
| public long rate() { |
| return (current - previous) / interval; |
| } |
| |
| @Override |
| public long latest() { |
| return current; |
| } |
| |
| @Override |
| public boolean isValid() { |
| return isValid; |
| } |
| |
| @Override |
| public long time() { |
| return time; |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper("Load").add("rate", rate()) |
| .add("latest", latest()).toString(); |
| |
| } |
| } |