Technical principle of caffeine cache framework based on the Java library

Technical principle of caffeine cache framework based on the Java library introduction: During the development process, cache is a common optimization technology that can significantly improve the performance and response time of the application.The caching cache framework in the Java library is a powerful tool that provides a series of functions to manage cache data.This article will introduce the technical principles of the cache cache framework and use the Java code example to demonstrate its usage method. 1. Overview of the cache cache framework: The cache cache framework is a high -performance, lock -free, and thread safety cache library developed by Google.It is based on the Java library and provides a very convenient way to create and manage cache data.The cache cache frame uses memory as a storage medium, which can significantly improve the performance of the application and reduce the frequency of access to the back -end data source. 2. Technical principles of the cache cache framework: 1. Create a cache object: Using the cache framework, you first need to create a cache object as a container for cache data.You can create a cache object by using the static method of the Cachebuilder class, such as: LoadingCache<String, String> cache = CacheBuilder.newBuilder() .maximumSize(1000) .expireAfterWrite(10, TimeUnit.MINUTES) .build( new CacheLoader<String, String>() { public String load(String key) { // Logic the logic of data from the data source return loadDataFromDataSource(key); } }); The above code creates a cache object, which can store up to 1,000 key value pairs in the cache, and the expiration time of the data object is 10 minutes.If there is no corresponding value in the cache, the data will be loaded from the data source through the custom cacheLoader. 2. Storage and cache data: Use cache objects can easily store and obtain cache data.For example, you can use the PUT method to store the cache data and use the get method to obtain the cache data.The example is as follows: cache.put ("key1", "value1"); // Put the key value into the cache String value = cache.get ("key1"); // Get the value of the corresponding key from the cache The above code stores the key value to the ("key1", "value1") into the cache, and use the get method to obtain the key "key1". 3. Caches loading and refreshing strategies: The caching cache framework provides flexible cache loading and refreshing strategies.By customized Cacheloader objects, the logic of loading data from the data source can be realized, and the data is automatically refreshed when the cache data expires.For example: new CacheLoader<String, String>() { public String load(String key) { // Logic the logic of data from the data source return loadDataFromDataSource(key); } }; The above code defines a custom Cacheloader object. When there is no key corresponding to the key in the cache, the load method loads the data from the data source. 4. Expiration strategy of cache data: Caffeine cache framework allows developers to define expiration strategies for cache data.The expiration of the cache data can be set according to time, size and other conditions to ensure the effectiveness and consistency of the cache data.For example, you can use the ExpireAFTERWRITE method to set the expiration time of the cache data: CacheBuilder.newBuilder() .expireAfterWrite(10, TimeUnit.MINUTES) // Other configuration items ... .build(); The above code indicates that the cache data will expire after 10 minutes, and the data will be automatically refreshed through cacheLoader after expire. Third, precautions for cache cache framework: 1. Cache size settings: When using cache cache frames, you need to pay attention to the setting of the cache size.If the cache size exceeds the maximum value of the setting, the removal of the altosimer will be triggered. 2. Caches Equipment: The caffeine caching framework is safe and can support the access and operation of the cache data at the same time.It uses lock-free algorithm and CAS (Compare-AD-SWAP) operation to ensure the consistency and concurrency processing performance of the data. 3. Elimination strategy: When the cache space is full, the caffeine caching framework uses the LRU (Least Recently Use) strategy to eliminate the recent cache items that have been used at least to release new cache data. in conclusion: Caffeine cache framework is a powerful cache tool. It is based on the Java class library and provides rich functions to manage cache data.It can significantly improve the performance and response time of the application and reduce access to the back -end data source.Through the introduction of this article, you can understand the technical principles of cache cache framework and master its usage in Java development. I hope this article will help you understand the technical principles of cache cache framework!