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| | | /*
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| | | * Copyright 2011 gitblit.com.
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| | | *
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| | | * Licensed under the Apache License, Version 2.0 (the "License");
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| | | * you may not use this file except in compliance with the License.
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| | | * You may obtain a copy of the License at
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| | | *
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| | | * http://www.apache.org/licenses/LICENSE-2.0
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| | | *
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| | | * Unless required by applicable law or agreed to in writing, software
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| | | * distributed under the License is distributed on an "AS IS" BASIS,
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| | | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| | | * See the License for the specific language governing permissions and
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| | | * limitations under the License.
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| | | */
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| | | package com.gitblit.utils;
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| | |
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| | | import java.io.Serializable;
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| | | import java.util.Date;
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| | | import java.util.Map;
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| | | import java.util.concurrent.ConcurrentHashMap;
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| | |
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| | | /**
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| | | * Reusable coarse date-based object cache. The date precision is in
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| | | * milliseconds and in fast, concurrent systems this cache is too simplistic.
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| | | * However, for the cases where its being used in Gitblit this cache technique
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| | | * is just fine.
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| | | * |
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| | | * @author James Moger
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| | | * |
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| | | */
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| | | public class ObjectCache<X> implements Serializable {
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| | |
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| | | private static final long serialVersionUID = 1L;
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| | |
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| | | private final Map<String, CachedObject<X>> cache = new ConcurrentHashMap<String, CachedObject<X>>();
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| | |
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| | | private class CachedObject<Y> {
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| | |
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| | | public final String name;
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| | |
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| | | private volatile Date date;
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| | |
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| | | private volatile Y object;
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| | | CachedObject(String name) {
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| | | this.name = name;
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| | | date = new Date(0);
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| | | }
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| | |
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| | | @Override
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| | | public String toString() {
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| | | return getClass().getSimpleName() + ": " + name;
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| | | }
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| | | }
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| | |
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| | | public boolean hasCurrent(String name, Date date) {
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| | | return cache.containsKey(name) && cache.get(name).date.compareTo(date) == 0;
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| | | }
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| | |
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| | | public Date getDate(String name) {
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| | | return cache.get(name).date;
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| | | }
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| | |
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| | | public X getObject(String name) {
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| | | if (cache.containsKey(name)) {
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| | | return cache.get(name).object;
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| | | }
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| | | return null;
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| | | }
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| | |
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| | | public void updateObject(String name, X object) {
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| | | this.updateObject(name, new Date(), object);
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| | | }
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| | |
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| | | public void updateObject(String name, Date date, X object) {
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| | | CachedObject<X> obj;
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| | | if (cache.containsKey(name)) {
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| | | obj = cache.get(name);
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| | | } else {
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| | | obj = new CachedObject<X>(name);
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| | | cache.put(name, obj);
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| | | }
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| | | obj.date = date;
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| | | obj.object = object;
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| | | }
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| | |
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| | | public X remove(String name) {
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| | | if (cache.containsKey(name)) {
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| | | return cache.remove(name).object;
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| | | }
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| | | return null;
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| | | }
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| | | |
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| | | public int size() {
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| | | return cache.size();
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| | | }
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| | | }
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