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/*
* This file is part of spark.
*
* Copyright (c) lucko (Luck) <luck@lucko.me>
* Copyright (c) contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package me.lucko.spark.common.sampler.window;
import me.lucko.spark.common.sampler.aggregator.DataAggregator;
import java.util.function.IntPredicate;
public enum ProfilingWindowUtils {
;
/**
* The size/duration of a profiling window in seconds.
* (1 window = 1 minute)
*/
public static final int WINDOW_SIZE_SECONDS = 60;
/**
* The number of windows to record in continuous profiling before data is dropped.
* (60 windows * 1 minute = 1 hour of profiling data)
*/
public static final int HISTORY_SIZE = Integer.getInteger("spark.continuousProfilingHistorySize", 60);
/**
* Gets the profiling window for the given time in unix-millis.
*
* @param time the time in milliseconds
* @return the window
*/
public static int unixMillisToWindow(long time) {
return (int) (time / (WINDOW_SIZE_SECONDS * 1000L));
}
/**
* Gets the window at the current time.
*
* @return the window
*/
public static int windowNow() {
return unixMillisToWindow(System.currentTimeMillis());
}
/**
* Gets a prune predicate that can be passed to {@link DataAggregator#pruneData(IntPredicate)}.
*
* @return the prune predicate
*/
public static IntPredicate keepHistoryBefore(int currentWindow) {
// windows that were earlier than (currentWindow minus history size) should be pruned
return window -> window < (currentWindow - HISTORY_SIZE);
}
}
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