Java tutorial
/** * Copyright (c) 2000-present Liferay, Inc. All rights reserved. * * This library is free software; you can redistribute it and/or modify it under * the terms of the GNU Lesser General Public License as published by the Free * Software Foundation; either version 2.1 of the License, or (at your option) * any later version. * * This library 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 Lesser General Public License for more * details. */ package com.liferay.portal.kernel.backgroundtask; import com.liferay.petra.lang.CentralizedThreadLocal; import com.liferay.petra.lang.SafeClosable; /** * @author Michael C. Han */ public class BackgroundTaskThreadLocal { public static long getBackgroundTaskId() { return _backgroundTaskId.get(); } public static boolean hasBackgroundTask() { long backgroundTaskId = getBackgroundTaskId(); if (backgroundTaskId > 0) { return true; } return false; } /** * @deprecated As of Athanasius (7.3.x), replaced by {@link * #setBackgroundTaskIdWithSafeClosable(long)} */ @Deprecated public static void setBackgroundTaskId(long backgroundTaskId) { if (backgroundTaskId > 0) { _backgroundTaskId.set(backgroundTaskId); } } public static SafeClosable setBackgroundTaskIdWithSafeClosable(long backgroundTaskId) { if (backgroundTaskId > 0) { return _backgroundTaskId.setWithSafeClosable(backgroundTaskId); } return () -> { }; } private static final CentralizedThreadLocal<Long> _backgroundTaskId = new CentralizedThreadLocal<>( BackgroundTaskThreadLocal.class + "._backgroundTaskId", () -> 0L); }