feat: add caching

pom.xml

@@ -42,6 +42,19 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-cache</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.ehcache</groupId>
+			<artifactId>ehcache</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>javax.cache</groupId>
+			<artifactId>cache-api</artifactId>
+			<version>1.1.1</version>
+		</dependency>
 		<dependency>
 			<groupId>org.hibernate.validator</groupId>
 			<artifactId>hibernate-validator</artifactId>

src/main/java/de/caritas/cob/mailservice/api/cache/CacheEventLogger.java

@@ -0,0 +1,15 @@
+package de.caritas.cob.mailservice.api.cache;
+
+import lombok.extern.slf4j.Slf4j;
+import org.ehcache.event.CacheEvent;
+import org.ehcache.event.CacheEventListener;
+
+@Slf4j
+public class CacheEventLogger implements CacheEventListener<Object, Object> {
+
+  @Override
+  public void onEvent(CacheEvent<? extends Object, ? extends Object> cacheEvent) {
+    log.info(
+        "caching event: ", cacheEvent.getKey(), cacheEvent.getOldValue(), cacheEvent.getNewValue());
+  }
+}

src/main/java/de/caritas/cob/mailservice/api/service/TranslationService.java

@@ -13,10 +13,10 @@
 import org.apache.commons.io.IOUtils;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.cache.annotation.CacheEvict;
+import org.springframework.cache.annotation.Cacheable;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
 import org.springframework.web.client.HttpClientErrorException;
-import springfox.documentation.annotations.Cacheable;
 
 @Service
 @Slf4j
@@ -43,6 +43,7 @@ public TranslationService(TranlationMangementServiceApiClient tranlationMangemen
   @Cacheable(value = "translations")
   public Map<String, String> fetchTranslations(String languageCode) {
     try {
+
       return fetchTranslationAsMap(languageCode);
     } catch (JsonProcessingException ex) {
       throw new TranslationServiceException(String.format(

src/main/java/de/caritas/cob/mailservice/config/AppConfig.java

@@ -1,6 +1,7 @@
 package de.caritas.cob.mailservice.config;
 
 import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.context.MessageSource;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
@@ -13,6 +14,7 @@
  */
 @Configuration
 @ComponentScan(basePackages = {"de.caritas.cob.mailservice"})
+@EnableCaching
 public class AppConfig {
 
   /**

src/main/resources/application.properties

@@ -72,4 +72,6 @@ management.endpoint.health.enabled=true
 management.endpoint.health.show-details=never
 management.endpoints.web.exposure.include=health
 management.health.probes.enabled=true
+spring.cache.jcache.config=classpath:ehcache.xml
 
+logging.level.net.sf.ehcache=info

src/main/resources/ehcache.xml

@@ -0,0 +1,38 @@
+<config
+  xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
+  xmlns='http://www.ehcache.org/v3'
+  xsi:schemaLocation="
+            http://www.ehcache.org/v3
+            http://www.ehcache.org/schema/ehcache-core-3.7.xsd">
+
+  <cache alias="translations">
+    <expiry>
+      <ttl unit="seconds">60</ttl>
+    </expiry>
+
+    <resources>
+      <offheap unit="MB">10</offheap>
+    </resources>
+  </cache>
+
+  <cache-template name="default">
+    <expiry>
+      <ttl unit="seconds">60</ttl>
+    </expiry>
+    <listeners>
+      <listener>
+        <class>de.caritas.cob.mailservice.api.cache.CacheEventLogger</class>
+        <event-firing-mode>ASYNCHRONOUS</event-firing-mode>
+        <event-ordering-mode>UNORDERED</event-ordering-mode>
+        <events-to-fire-on>CREATED</events-to-fire-on>
+        <events-to-fire-on>EXPIRED</events-to-fire-on>
+        <events-to-fire-on>EVICTED</events-to-fire-on>
+      </listener>
+    </listeners>
+    <resources>
+      <heap>1000</heap>
+      <offheap unit="MB">10</offheap>
+      <disk persistent="true" unit="MB">20</disk>
+    </resources>
+  </cache-template>
+</config>