Apache DirectMemory :: Cache performance optimization skills

Apache DirectMemory is an open source Java cache library that provides some techniques to optimize the cache performance.This article will introduce some efficient usage methods of Apache DirectMemory and some skills that can improve cache performance. 1. Use the correct cache strategy: The cache strategy is one of the key factors that determine how the cache object is stored and access.Apache DirectMemory provides a variety of cache strategies, including LRU (recently used), LFU (at the least often), and FIFO (advanced first).Choose the correct cache strategy to optimize memory usage and performance based on your business needs and access mode.The following is a sample code to show how to use the LRU cache strategy: // Create a cavity container CacheConfiguration cacheConfiguration = new CacheConfiguration(); cacheConfiguration.setEvictionConfiguration( new EvictionConfiguration(EvictionStrategy.LRU, new LRUConfiguration(1000))); // Initialize cache Cache<String, Object> cache = new Cache<String, Object>(cacheConfiguration); // Put the object in the cache cache.put("key", object); // Get the object from the cache Object cachedObject = cache.get("key"); 2. Reasonably set the cache capacity: Reasonable setting cache capacity is the key to optimizing cache performance.If the cache capacity is too small, it may cause frequent cache export operations and cache to affect performance.If the cache capacity is too large, it may occupy too much memory resources.Therefore, the cache capacity needs to be set according to the actual situation of the application and available memory resources.The following example code shows how to set the cache capacity: // Initialize cache CacheConfiguration cacheConfiguration = new CacheConfiguration(); cacheConfiguration.setEvictionConfiguration( new EvictionConfiguration(EvictionStrategy.LRU, new LRUConfiguration(1000))); // Set the cache capacity cacheConfiguration.setCapacity(10000); // Create a cache Cache<String, Object> cache = new Cache<String, Object>(cacheConfiguration); 3. Use the appropriate serialization method: By default, Apache DirectMemory uses Java serialization provided by JDK to store and restore cache objects.However, the efficiency of Java serialization is relatively low.If the performance requirements are high, you can consider using other efficient serialization methods, such as Kryo or Protobuf.The following example code shows how to use the Kryo serialization method: // Introduce Kryo dependencies <dependency> <groupId>com.esotericsoftware.kryo</groupId> <artifactId>kryo</artifactId> <version>4.0.2</version> </dependency> // Initialize Kryo serializer Kryo kryo = new Kryo(); kryo.register(MyClass.class); // Use kryo serialization Serializer serializer = new KryoSerializer(kryo); CacheConfiguration cacheConfiguration = new CacheConfiguration(); cacheConfiguration.setSerializer(serializer); 4. Avoid frequent cache operations: Frequent cache operations may lead to decline in performance.To avoid this situation, batch operations or delay operations can be used.Batch operations can reduce network overhead and lock competition, and delayed operations can reduce the frequency of cache operation.The following is a sample code using batch operation and delay operation: // Batch writing cache Map<String, Object> objects = new HashMap<>(); objects.put("key1", object1); objects.put("key2", object2); cache.putAll(objects); // Delete the cache cache.remove("key", 500, TimeUnit.MILLISECONDS); Summarize: By selecting the correct cache strategy, reasonable setting cache capacity, using efficient serialization methods, and avoiding frequent cache operations, the cache performance of Apache DirectMemory can be effectively improved.I hope the skills and sample code described in this article can help you optimize cache performance in actual projects.