This is because the cache eviction is executed asynchronously, and this method helps to await the completion of the eviction. It is worth mention that we call the cleanUp method before getting the cache size. We can add the second value to the cache, which leads to the removal of the first value: cache.get("B") When we add a value, the size obviously increases: cache.get("A") build(k -> DataObject.get("Data for " + k)) When the cache is initialized, its size is equal to zero: LoadingCache cache = Caffeine.newBuilder() Let’s see how we could count objects in the cache. There are two ways of getting the size - counting objects in the cache, or getting their weights. ![]() This type of eviction assumes that eviction occurs when the configured size limit of the cache is exceeded. Sometimes we need to invalidate some cached values manually: That’s why using get is preferable to getIfPresent. This means that the computation will be made only once - even if several threads ask for the value simultaneously. The get method performs the computation atomically. get(key, k -> DataObject.get("Data for A")) ĪssertEquals("Data for A", dataObject.getData()) ![]() This function will be used for providing the fallback value if the key is not present in the cache, which would be inserted in the cache after computation: dataObject = cache We can also get the value using the get method, which takes a Function along with a key as an argument. We can populate the cache manually using the put method: cache.put(key, dataObject) This method will return null if the value is not present in the cache: String key = "A" ĭataObject dataObject = cache.getIfPresent(key) And because Caffeine can be used as an energy saver, the clock widget makes it easier to see which of your many activities are keeping your computer from sleeping.Now, we can get some value from the cache using the getIfPresent method. In addition, the built-in calendar and clock widget make it easy to set recurring events for the Mac's built-in alarm system. It also helps you save battery life so that Macs do not have to be put on sleep mode for long periods of time. For those who use the computer at night and need a little bit of a pick-me-up to get them prepared for a day of productive work, the built-in sleep manager makes sure that the computer is properly set to save energy when needed. The Caffeine app serves a dual purpose for Mac owners. Some of these commands include Go to, Home, Close Help, Quit, Restore, and a host of others. It also provides support for a large number of commonly used commands that allow you to work with your Mac as if you were in a fully functional internet browser. The built-in screenshot tool allows the user to take a snapshot of whatever the screen is currently displaying. ![]() While the primary function of the Caffeine app is to allow the user to play a YouTube video or a video from a photo gallery directly from the Mac's clipboard, it also has additional features that make this experience more interesting. As such, it is available for both the Classic and the newer Leopard. The most notable benefit for this application is that it can be used with any version of Mac OS X. Instead, all the work can be done with a few simple mouse clicks. This version is particularly useful for those who want to view a video or YouTube video while they don't have to physically tap the keyboard or touch the mouse to open the screensaver. The Caffeine applications does not require users to go to the power saver area within the System Settings in the Mac desktop to change the settings on the computer.
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