adding ehcache. closes #21

pom.xml

@@ -67,6 +67,18 @@
             <artifactId>lombok</artifactId>
             <optional>true</optional>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-cache</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>javax.cache</groupId>
+            <artifactId>cache-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.ehcache</groupId>
+            <artifactId>ehcache</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.mapstruct</groupId>
             <artifactId>mapstruct</artifactId>

src/main/java/guru/springframework/msscbeerservice/config/CacheConfig.java

@@ -0,0 +1,12 @@
+package guru.springframework.msscbeerservice.config;
+
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Created by jt on 2019-06-09.
+ */
+@EnableCaching
+@Configuration
+public class CacheConfig {
+}

src/main/java/guru/springframework/msscbeerservice/services/BeerServiceImpl.java

@@ -8,6 +8,7 @@
 import guru.springframework.msscbeerservice.web.model.BeerPagedList;
 import guru.springframework.msscbeerservice.web.model.BeerStyleEnum;
 import lombok.RequiredArgsConstructor;
+import org.springframework.cache.annotation.Cacheable;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.stereotype.Service;
@@ -25,6 +26,7 @@ public class BeerServiceImpl implements BeerService {
     private final BeerRepository beerRepository;
     private final BeerMapper beerMapper;
 
+    @Cacheable(cacheNames = "beerListCache", condition = "#showInventoryOnHand == false ")
     @Override
     public BeerPagedList listBeers(String beerName, BeerStyleEnum beerStyle, PageRequest pageRequest, Boolean showInventoryOnHand) {
 
@@ -69,6 +71,7 @@ public BeerPagedList listBeers(String beerName, BeerStyleEnum beerStyle, PageReq
         return beerPagedList;
     }
 
+    @Cacheable(cacheNames = "beerCache", key = "#beerId", condition = "#showInventoryOnHand == false ")
     @Override
     public BeerDto getById(UUID beerId, Boolean showInventoryOnHand) {
         if (showInventoryOnHand) {

src/main/java/guru/springframework/msscbeerservice/web/model/BeerDto.java

@@ -10,6 +10,7 @@
 import javax.validation.constraints.NotNull;
 import javax.validation.constraints.Null;
 import javax.validation.constraints.Positive;
+import java.io.Serializable;
 import java.math.BigDecimal;
 import java.time.OffsetDateTime;
 import java.util.UUID;
@@ -22,7 +23,9 @@
 @NoArgsConstructor
 @AllArgsConstructor
 @Builder
-public class BeerDto {
+public class BeerDto implements Serializable  {
+
+    static final long serialVersionUID = -5815566940065181210L;
 
     @Null
     private UUID id;

src/main/java/guru/springframework/msscbeerservice/web/model/BeerPagedList.java

@@ -8,12 +8,15 @@
 import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
 
+import java.io.Serializable;
 import java.util.List;
 
 /**
  * Created by jt on 2019-05-12.
  */
-public class BeerPagedList extends PageImpl<BeerDto> {
+public class BeerPagedList extends PageImpl<BeerDto> implements Serializable {
+
+    static final long serialVersionUID = 1114715135625836949L;
 
     @JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
     public BeerPagedList(@JsonProperty("content") List<BeerDto> content,

src/main/resources/application.properties

@@ -1,2 +1,3 @@
 sfg.brewery.beer-inventory-service-host=http://localhost:8082
 spring.datasource.initialization-mode=EMBEDDED
+spring.cache.jcache.config=classpath:ehcache.xml

src/main/resources/ehcache.xml

@@ -0,0 +1,20 @@
+<config
+        xmlns:jsr107='http://www.ehcache.org/v3/jsr107'
+        xmlns='http://www.ehcache.org/v3'>
+    <service>
+        <jsr107:defaults enable-management="true" enable-statistics="true"/>
+    </service>
+
+    <cache alias="beerCache" uses-template="config-cache"/>
+    <cache alias="beerListCache" uses-template="config-cache"/>
+
+    <cache-template name="config-cache">
+        <expiry>
+            <ttl unit="minutes">5</ttl>
+        </expiry>
+        <resources>
+            <heap>1</heap>
+            <offheap unit="MB">1</offheap>
+        </resources>
+    </cache-template>
+</config>