com.fluxtion.agrona.concurrent.CachedEpochClock Maven / Gradle / Ivy
/*
* Copyright 2014-2024 Real Logic Limited.
*
* 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
*
* https://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.fluxtion.agrona.concurrent;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
/**
* Pad out a cacheline to the left of a value to prevent false sharing.
*/
@SuppressWarnings("unused")
abstract class CachedEpochClockPadding
{
boolean p000, p001, p002, p003, p004, p005, p006, p007, p008, p009, p010, p011, p012, p013, p014, p015;
boolean p016, p017, p018, p019, p020, p021, p022, p023, p024, p025, p026, p027, p028, p029, p030, p031;
boolean p032, p033, p034, p035, p036, p037, p038, p039, p040, p041, p042, p043, p044, p045, p046, p047;
boolean p048, p049, p050, p051, p052, p053, p054, p055, p056, p057, p058, p059, p060, p061, p062, p063;
}
/**
* Value for the sequence that is expected to be padded.
*/
abstract class CachedEpochClockValue extends CachedEpochClockPadding
{
/**
* Time in milliseconds.
*/
protected volatile long timeMs;
}
/**
* An {@link EpochClock} that caches a timestamp which can be updated with {@link #update(long)}.
*
* Instances are threadsafe with the read being volatile.
*/
public class CachedEpochClock extends CachedEpochClockValue implements EpochClock
{
private static final AtomicLongFieldUpdater FIELD_UPDATER =
AtomicLongFieldUpdater.newUpdater(CachedEpochClockValue.class, "timeMs");
boolean p064, p065, p066, p067, p068, p069, p070, p071, p072, p073, p074, p075, p076, p077, p078, p079;
boolean p080, p081, p082, p083, p084, p085, p086, p087, p088, p089, p090, p091, p092, p093, p094, p095;
boolean p096, p097, p098, p099, p100, p101, p102, p103, p104, p105, p106, p107, p108, p109, p110, p111;
boolean p112, p113, p114, p115, p116, p117, p118, p119, p120, p121, p122, p123, p124, p125, p126, p127;
/**
* {@inheritDoc}
*/
public long time()
{
return timeMs;
}
/**
* Update the value of the timestamp in with release ordered semantics.
*
* @param timeMs value to update the timestamp.
*/
public void update(final long timeMs)
{
FIELD_UPDATER.lazySet(this, timeMs);
}
/**
* Advance the value of the timestamp in with release ordered semantics.
*
* @param millis to advance the timestamp.
*/
public void advance(final long millis)
{
FIELD_UPDATER.lazySet(this, timeMs + millis);
}
}