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/*
* Copyright 2014 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();
}
}
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