Mercurial > hg > release > thermostat-1.2
view web/client/src/main/java/com/redhat/thermostat/web/client/internal/ExpirableWebPreparedStatementCache.java @ 1660:c6ae78b6f3ac
[Thermostat 1.2] Update copyright year to 2015
Reviewed-by: omajid
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2015-March/013127.html
PR2273
author | Severin Gehwolf <sgehwolf@redhat.com> |
---|---|
date | Wed, 11 Mar 2015 15:07:27 +0100 |
parents | 605f0c269f1c |
children |
line wrap: on
line source
/* * Copyright 2012-2015 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat 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 2, or (at your * option) any later version. * * Thermostat 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 Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.web.client.internal; import com.redhat.thermostat.storage.core.StatementDescriptor; import com.redhat.thermostat.storage.model.Pojo; import com.redhat.thermostat.web.common.SharedStateId; /** * A {@link WebPreparedStatementCache} with an expiration time. When that time * has passed it will return null for all cache entries. Used as a read-only * transition cache in {@link WebStorage} in order to recover from server * component reloads. * */ class ExpirableWebPreparedStatementCache extends WebPreparedStatementCache { private final long timeExpires; private final WebPreparedStatementCache cache; ExpirableWebPreparedStatementCache(WebPreparedStatementCache cache, long timeExpires) { this.timeExpires = timeExpires; this.cache = cache; } @Override synchronized <T extends Pojo> WebPreparedStatementHolder get(StatementDescriptor<T> desc) { WebPreparedStatementHolder holder = cache.get(desc); if (holder == null) { return null; } // check if corresponding cache entry has expired long now = System.nanoTime(); if (now > timeExpires) { // remove cache entry and return null SharedStateId id = holder.getStatementId(); cache.remove(id); return null; } return holder; } @Override synchronized <T extends Pojo> StatementDescriptor<T> get(SharedStateId id) { StatementDescriptor<T> desc = cache.get(id); if (desc == null) { return null; } long now = System.nanoTime(); if (now > timeExpires) { // remove cache entry and return null cache.remove(id); return null; } return desc; } boolean isExpired() { return System.nanoTime() > timeExpires; } }