com.hazelcast.internal.util.TimeStripUtil Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2024, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.internal.util;
import com.hazelcast.map.impl.record.Record;
import static com.hazelcast.internal.util.TimeUtil.zeroOutMs;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
/**
* Contains millis to seconds, second to millis
* conversions based on a fixed epoch time.
*/
public final class TimeStripUtil {
/**
* Base time to be used for storing time values as diffs
* (int) rather than full-blown epoch based values (long)
* This allows for a space in seconds, of roughly 68 years.
*
* Reference value (1514764800000) -
* Monday, January 1, 2018 12:00:00 AM
*
* The fixed time in the past (instead of {@link
* System#currentTimeMillis()} prevents any time
* discrepancies among nodes, mis-translated as
* diffs of -1 i.e. {@link Record#UNSET} values.
*
* (see:
* https://github.com/hazelcast/hazelcast-enterprise/issues/2527)
*/
public static final long EPOCH_TIME_MILLIS = zeroOutMs(1514764800000L);
private static final int UNSET = -1;
private TimeStripUtil() {
}
public static int stripBaseTime(long millis) {
if (millis == Long.MAX_VALUE) {
return Integer.MAX_VALUE;
}
if (millis > 0) {
long toSeconds = MILLISECONDS.toSeconds(millis - EPOCH_TIME_MILLIS);
return toSeconds >= Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) toSeconds;
}
return UNSET;
}
public static long recomputeWithBaseTime(int seconds) {
if (seconds == UNSET) {
return 0L;
}
if (seconds == Integer.MAX_VALUE) {
return Long.MAX_VALUE;
}
return EPOCH_TIME_MILLIS + SECONDS.toMillis(seconds);
}
}