The expansion and customization method of the Kurgan framework in the Java library

The Kurgan framework is a tool that is used in the Java library to quickly build a key value storage in memory.It provides many expansion and customization methods, enabling developers to customize the storage system according to specific needs.This article will introduce the expansion and customization method of the Kurgan framework and provide the corresponding Java code example. 1. The basic concept of the Kurgan framework The Kurgan framework is based on the key value storage model, similar to the traditional MAP interface.In Kurgan, the data is stored as Key-Value pair. The key is a unique identifier, and Value can be any object.Kurgan provides efficient inquiries and storage operations, and supports transaction management and persistent storage. Second, use the Kurgan framework To use the Kurgan framework, you need to add Kurgan's dependency to the project construction file.You can add the following content to the pom.xml file of the project: <dependency> <groupId>com.kurgan</groupId> <artifactId>kurgan-core</artifactId> <version>1.0.0</version> </dependency> Then, the Kurgan package is introduced in the code: import com.kurgan.core.Kurgan; Next, you can create a Kurgan instance and start using it.The following example shows how to use Kurgan for storage and query operations: // Create a Kurgan instance Kurgan kurgan = new Kurgan(); // Storing data kurgan.put("key1", "value1"); kurgan.put("key2", "value2"); // Query data String value1 = kurgan.get("key1"); System.out.println (Value1); // Output: Value1 String value2 = kurgan.get("key2"); System.out.println (value2); // Output: Value2 3. Extension of the Kurgan framework The Kurgan framework provides expansion methods that can customize different behaviors when storing and querying data.The following example shows how to use the Kurgan's extension method to customize the storage system: 1. Add data expiration time // Storage data with expired time kurgan.putwitwithexpiration ("Key3", "Value3", 60); // Data 60 seconds expires later // Query data String value3 = kurgan.get ("key3"); // When the return value is "Value3" within 60 seconds System.out.println(value3); Thread.sleep (6000); // Waiting for 60 seconds String expiredvalue = kurgan.get ("key3"); // The data has expired, the return value is null System.out.println(expiredValue); 2. Custom storage strategy // Create a custom storage strategy class MyStorageStrategy implements Kurgan.StorageStrategy { @Override public boolean shouldStore(String key, Object value) { // Custom storage rules return key.startsWith("prefix"); } } // Set customized storage strategy kurgan.setStorageStrategy(new MyStorageStrategy()); // Storing data kurgan.put ("Prefix1_Key", "Value1"); // In line with the storage rules, the data is stored kurgan.put ("key2", "value2"); // does not meet the storage rules, data is not stored // Query data String value1 = kurgan.get("prefix1_key"); System.out.println (Value1); // Output: Value1 String value2 = kurgan.get("key2"); System.out.println (value2); // Output: null Fourth, customized method of Kurgan framework In addition to the expansion method, the Kurgan framework also provides customized methods to allow developers to control the storage system more fine -grained.The following example shows how to use the custom method of Kurgan to configure the storage system: 1. Configure the storage capacity limit // Set the storage capacity upper limit to 100 kurgan.setCapacity(100); // Storing data for (int i = 0; i < 200; i++) { kurgan.put("key" + i, "value" + i); } // Query data String value50 = kurgan.get ("key50"); // data can still be query, because the storage capacity will not limit the query System.out.println (value50); // Output: Value50 String value150 = kurgan.get ("key150"); // data has been removed because the storage capacity has exceeded the upper limit System.out.println (Value150); // Output: null 2. Configuration storage // Configure persistence storage kurgan.enablepersistence ("data.dat"); // store the data into the file "data.dat" // Storing data kurgan.put("key1", "value1"); // Create a Kurgan instance and load durable data Kurgan newKurgan = new Kurgan(); newKurgan.loadFromPersistence("data.dat"); // Query data String value1 = newKurgan.get("key1"); System.out.println (Value1); // Output: Value1 In summary, the Kurgan framework provides a wealth of expansion and customization methods, enabling developers to customize the key value storage system in memory according to specific needs.Through the expansion method, developers can add expired time and custom storage strategies; through customized methods, developers can configure storage capacity and persistent storage.The use of these methods can greatly improve the performance and flexibility of the application. The above is the introduction of the knowledge of the Kurgan framework in the Java library's expansion and customization method. I hope it can help you.