Explore the cache mechanism of Google Collection framework in the Java class library

Explore the cache mechanism of Google Collection framework in the Java class library Summary: In modern software development, cache is a common technical means to improve the performance and response speed of the application.Google Collection is a powerful Java class library that provides various data structures and algorithms, which contains a complete cache mechanism.This article will explore the cache mechanism of the Google Collect framework in the Java class library and provide some Java code example as a description. 1. What is cache? In computer science, cache is a storage technology that is used to temporarily save data to reduce the number of reads of original data.When the application needs to access a certain data, first check whether the data exists in the cache. If it exists, it will be obtained directly from the cache to avoid access to the underlying data source and improve the access speed and performance. 2. Overview of Google Collect framework Google Collect (now renamed Guava) is a popular Java class library, developed and maintained by Google.This type of library provides a variety of commonly used data structure and algorithm implementation, as well as some practical tool classes.One of the most important functions is the cache mechanism, which provides a strong cache implementation to manage data cache in the application. 3. Use Google Collection cache mechanism 3.1 Add Google Collection dependencies To use the Google Collect caching mechanism in the Java project, you need to build a corresponding dependencies through building tools such as Maven or Gradle. Maven dependencies: <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>30.1-jre</version> </dependency> Gradle dependencies: groovy implementation 'com.google.guava:guava:30.1-jre' 3.2 Create a cache object Before using the cache mechanism of Google Collect, we first need to create a cache object.You can use the Cachebuilder class to create a new cache object. Cache<String, Object> cache = CacheBuilder.newBuilder() .maximumSize(100) .expireAfterWrite(10, TimeUnit.MINUTES) .build(); The above code creates a maximum capacity of 100 purpose cache objects, and sets the expiration time after each entry is written for 10 minutes. 3.3 Add data to the cache You can use the PUT method to add data to the cache. cache.put("key1", "value1"); cache.put("key2", "value2"); 3.4 Get data from the cache Use the get method to get data from the cache. Object value1 = cache.get("key1"); Object value2 = cache.getIfPresent("key2"); 3.5 Cleaning the cache You can use the InvalIdate method to remove the data in the cache. cache.invalidate("key1"); cache.invalidateAll(); 4. Advantages of the cache mechanism The cache mechanism using Google Collect can bring the following advantages: -In improve the performance and response speed of the application -Re reduce the pressure of the underlying data source and improve the scaling of the system -Profile data expiration and automatic elimination strategies to avoid data expiration problems -Su strong configuration options and monitoring mechanisms to facilitate custom cache strategies -In support concurrent access and thread security, suitable for multi -threaded environment in conclusion: The Google Collect framework provides a powerful cache mechanism in the Java library that can effectively improve the performance and response speed of the application.By using the cache mechanism of Google Collect, we can simplify the work of cache management and give full play to the advantages of other data structures and algorithms in the Java class library. references: -Gava official website: https://github.com/google/guava