Spring cache: custom key generator (#4166)

spring-mvc-java/src/main/java/com/baeldung/cache/BookService.java

@@ -0,0 +1,21 @@
+package com.baeldung.cache;
+
+import com.baeldung.model.Book;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.stereotype.Component;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Component
+public class BookService {
+
+    @Cacheable(value="books", keyGenerator="customKeyGenerator")
+    public List<Book> getBooks() {
+        List<Book> books = new ArrayList<Book>();
+        books.add(new Book(1, "The Counterfeiters", "André Gide"));
+        books.add(new Book(2, "Peer Gynt and Hedda Gabler", "Henrik Ibsen"));
+        return books;
+    }
+
+}

spring-mvc-java/src/main/java/com/baeldung/cache/CustomKeyGenerator.java

@@ -0,0 +1,14 @@
+package com.baeldung.cache;
+
+import org.springframework.cache.interceptor.KeyGenerator;
+import org.springframework.util.StringUtils;
+
+import java.lang.reflect.Method;
+
+public class CustomKeyGenerator implements KeyGenerator {
+
+    public Object generate(Object target, Method method, Object... params) {
+        return target.getClass().getSimpleName() + "_" + method.getName() + "_"
+                + StringUtils.arrayToDelimitedString(params, "_");
+    }
+}

spring-mvc-java/src/main/java/com/baeldung/model/Book.java

@@ -6,6 +6,15 @@ public class Book {
     private String author;
     private String title;
 
+    public Book() {
+    }
+
+    public Book(int id, String author, String title) {
+        this.id = id;
+        this.author = author;
+        this.title = title;
+    }
+
     public int getId() {
         return id;
     }

spring-mvc-java/src/main/java/com/baeldung/spring/web/config/ApplicationCacheConfig.java

@@ -0,0 +1,32 @@
+package com.baeldung.spring.web.config;
+
+import com.baeldung.cache.CustomKeyGenerator;
+import org.springframework.cache.Cache;
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.CachingConfigurerSupport;
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.cache.concurrent.ConcurrentMapCache;
+import org.springframework.cache.interceptor.KeyGenerator;
+import org.springframework.cache.support.SimpleCacheManager;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.Arrays;
+
+@EnableCaching
+@Configuration
+public class ApplicationCacheConfig extends CachingConfigurerSupport {
+
+    @Bean
+    public CacheManager cacheManager() {
+        SimpleCacheManager cacheManager = new SimpleCacheManager();
+        Cache booksCache = new ConcurrentMapCache("books");
+        cacheManager.setCaches(Arrays.asList(booksCache));
+        return cacheManager;
+    }
+
+    @Bean("customKeyGenerator")
+    public KeyGenerator keyGenerator() {
+        return new CustomKeyGenerator();
+    }
+}