JAVA-2421: Merge spring-ehcache module into spring-caching module (#10072)

* JAVA-2421: Moved 1 article from spring-ehcache to spring-caching

* JAVA-2421: Removed module spring-ehcache

* JAVA-2421: Removed module spring-ehcache from main pom

spring-caching/src/main/java/com/baeldung/cachetest/Application.java

@@ -0,0 +1,13 @@
+package com.baeldung.cachetest;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}

spring-caching/src/main/java/com/baeldung/cachetest/config/CacheConfig.java

@@ -0,0 +1,10 @@
+package com.baeldung.cachetest.config;
+
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableCaching
+public class CacheConfig {
+ 
+}

spring-caching/src/main/java/com/baeldung/cachetest/config/CacheEventLogger.java

@@ -0,0 +1,17 @@
+package com.baeldung.cachetest.config;
+
+import org.ehcache.event.CacheEvent;
+import org.ehcache.event.CacheEventListener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CacheEventLogger implements CacheEventListener<Object, Object> {
+
+    private static final Logger log = LoggerFactory.getLogger(CacheEventLogger.class);
+
+    @Override
+    public void onEvent(CacheEvent<? extends Object, ? extends Object> cacheEvent) {
+        log.info("Cache event {} for item with key {}. Old value = {}, New value = {}", cacheEvent.getType(), cacheEvent.getKey(), cacheEvent.getOldValue(), cacheEvent.getNewValue());
+    }
+
+}

spring-caching/src/main/java/com/baeldung/cachetest/rest/NumberController.java

@@ -0,0 +1,29 @@
+package com.baeldung.cachetest.rest;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.cachetest.service.NumberService;
+
+@RestController
+@RequestMapping(path = "/number", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
+public class NumberController {
+
+    private final static Logger log = LoggerFactory.getLogger(NumberController.class);
+
+    @Autowired
+    private NumberService numberService;
+
+    @GetMapping(path = "/square/{number}")
+    public String getThing(@PathVariable Long number) {
+        log.info("call numberService to square {}", number);
+        return String.format("{\"square\": %s}", numberService.square(number));
+    }
+
+}

spring-caching/src/main/java/com/baeldung/cachetest/service/NumberService.java

@@ -0,0 +1,23 @@
+package com.baeldung.cachetest.service;
+
+import java.math.BigDecimal;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.stereotype.Service;
+
+@Service
+public class NumberService {
+
+    private final static Logger log = LoggerFactory.getLogger(NumberService.class);
+
+    @Cacheable(value = "squareCache", key = "#number", condition = "#number>10")
+    public BigDecimal square(Long number) {
+        BigDecimal square = BigDecimal.valueOf(number)
+            .multiply(BigDecimal.valueOf(number));
+        log.info("square of {} is {}", number, square);
+        return square;
+    }
+
+}

spring-caching/src/main/java/com/baeldung/springdatacaching/model/Book.java

@@ -6,13 +6,15 @@ import lombok.NoArgsConstructor;
 
 import javax.persistence.Entity;
 import javax.persistence.Id;
+
+import java.io.Serializable;
 import java.util.UUID;
 
 @Data
 @Entity
 @NoArgsConstructor
 @AllArgsConstructor
-public class Book {
+public class Book implements Serializable {
 
     @Id
     private UUID id;