guava初始化缓存

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原创最新推荐文章于 2026-06-18 09:30:00 发布 2.5k 阅读 AI 写同款· GEO 优化 ›

详解 Guava Cache 一、Guava Cache 一般在项目中，本地缓存的实现为 ConcurrentHashMap，它具有线程安全、持久有效的特点。但是相较于传统缓存，它不具备缓存过期、缓存移除等特性，Google Guava 包内的 Cache 模块可能会给你一个新的选择。 Guava 目前托管于 GitHub，在项目中引入也是十分简单： <dependency> <groupId>... 阅读详情

publisherCache = CacheBuilder.newBuilder()
        .concurrencyLevel(1)
        .maximumSize(500)
        .refreshAfterWrite(CACHE_DURATION,TimeUnit.SECONDS).build(
                new CacheLoader<Long, MediaPublisher>() {

                    @Override
                    public ListenableFuture<MediaPublisher> reload(Long key, MediaPublisher oldValue) throws Exception {
                        checkNotNull(key);
                        checkNotNull(oldValue);
                        ListenableFutureTask<MediaPublisher> task = ListenableFutureTask.create(() -> load(key));
                        executor.submit(task);
                        return task;
                    }

                    @Override
                    public MediaPublisher load(Long appId) throws Exception {
                        long startTime = System.currentTimeMillis();
                        try {
                            MediaPublisher publisher = mediaPublisherDAO.getPublisher(appId);
                            PerfCounter.count(UnionServiceConstants.COUNTER_GET_MEDIA_PUBLISHER + ".db", 1, System.currentTimeMillis() - startTime);
                            if (null == publisher) {
                                PerfCounter.count(UnionServiceConstants.COUNTER_GET_MEDIA_PUBLISHER_NULL, 1);
                                return EMPTY_PUBLISHER;
                            }
                            return publisher;
                        }catch (Exception e){

                        }
                    }
                }
        );