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spring-boot ehcache example added (eugenp#6136)
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‎spring-ehcache/src/main/java/com/baeldung/cachetest/config/CacheConfig.java

+1-48
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@@ -1,57 +1,10 @@
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package com.baeldung.cachetest.config;
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import java.math.BigDecimal;
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import java.time.Duration;
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import javax.cache.CacheManager;
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import org.ehcache.config.CacheConfiguration;
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import org.ehcache.config.ResourcePools;
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import org.ehcache.config.builders.CacheConfigurationBuilder;
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import org.ehcache.config.builders.CacheEventListenerConfigurationBuilder;
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import org.ehcache.config.builders.ExpiryPolicyBuilder;
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import org.ehcache.config.builders.ResourcePoolsBuilder;
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import org.ehcache.config.units.EntryUnit;
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import org.ehcache.config.units.MemoryUnit;
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import org.ehcache.event.EventType;
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import org.ehcache.jsr107.Eh107Configuration;
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import org.springframework.boot.autoconfigure.cache.JCacheManagerCustomizer;
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import org.springframework.cache.annotation.EnableCaching;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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@Configuration
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@EnableCaching
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public class CacheConfig {
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private static final int ON_HEAP_CACHE_SIZE_ENTRIES = 2;
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private static final int OFF_HEAP_CACHE_SIZE_MB = 10;
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private static final int CACHE_EXPIRY_SECONDS = 30;
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@Bean
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public JCacheManagerCustomizer jcacheManagerCustomizer() {
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return new JCacheManagerCustomizer() {
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@Override
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public void customize(CacheManager cacheManager) {
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ResourcePools resourcePools = ResourcePoolsBuilder.newResourcePoolsBuilder()
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.heap(ON_HEAP_CACHE_SIZE_ENTRIES, EntryUnit.ENTRIES)
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.offheap(OFF_HEAP_CACHE_SIZE_MB, MemoryUnit.MB).build();
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CacheEventListenerConfigurationBuilder eventLoggerConfig = CacheEventListenerConfigurationBuilder
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.newEventListenerConfiguration(new CacheEventLogger(), EventType.CREATED, EventType.EXPIRED)
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.unordered().asynchronous();
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CacheConfiguration<?, ?> cacheConfiguration = CacheConfigurationBuilder
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.newCacheConfigurationBuilder(Long.class, BigDecimal.class, resourcePools)
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.withExpiry(ExpiryPolicyBuilder.timeToLiveExpiration(Duration.ofSeconds(CACHE_EXPIRY_SECONDS)))
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.add(eventLoggerConfig).build();
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cacheManager.createCache("squareCache",
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Eh107Configuration.fromEhcacheCacheConfiguration(cacheConfiguration));
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}
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};
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}
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}

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

+5-6
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@@ -7,12 +7,11 @@
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public class CacheEventLogger implements CacheEventListener<Object, Object> {
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private static final Logger log = LoggerFactory.getLogger(CacheEventLogger.class);
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private static final Logger log = LoggerFactory.getLogger(CacheEventLogger.class);
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@Override
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public void onEvent(CacheEvent<? extends Object, ? extends Object> cacheEvent) {
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log.info("Cache event {} for item with key {}. Old value = {}, New value = {}", cacheEvent.getType(),
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cacheEvent.getKey(), cacheEvent.getOldValue(), cacheEvent.getNewValue());
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}
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@Override
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public void onEvent(CacheEvent<? extends Object, ? extends Object> cacheEvent) {
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log.info("Cache event {} for item with key {}. Old value = {}, New value = {}", cacheEvent.getType(), cacheEvent.getKey(), cacheEvent.getOldValue(), cacheEvent.getNewValue());
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}
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}

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

+8-8
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@@ -15,15 +15,15 @@
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@RequestMapping(path = "/number", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
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public class NumberController {
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private final static Logger log = LoggerFactory.getLogger(NumberController.class);
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private final static Logger log = LoggerFactory.getLogger(NumberController.class);
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@Autowired
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private NumberService numberService;
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@Autowired
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private NumberService numberService;
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@GetMapping(path = "/square/{number}")
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public String getThing(@PathVariable Long number) {
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log.info("call numberService to square {}", number);
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return String.format("{\"square\": %s}", numberService.square(number));
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}
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@GetMapping(path = "/square/{number}")
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public String getThing(@PathVariable Long number) {
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log.info("call numberService to square {}", number);
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return String.format("{\"square\": %s}", numberService.square(number));
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}
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}

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

+8-7
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@@ -10,13 +10,14 @@
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@Service
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public class NumberService {
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private final static Logger log = LoggerFactory.getLogger(NumberService.class);
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private final static Logger log = LoggerFactory.getLogger(NumberService.class);
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@Cacheable(value = "squareCache", key = "#number", condition = "#number>10")
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public BigDecimal square(Long number) {
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BigDecimal square = BigDecimal.valueOf(number).multiply(BigDecimal.valueOf(number));
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log.info("square of {} is {}", number, square);
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return square;
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}
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@Cacheable(value = "squareCache", key = "#number", condition = "#number>10")
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public BigDecimal square(Long number) {
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BigDecimal square = BigDecimal.valueOf(number)
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.multiply(BigDecimal.valueOf(number));
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log.info("square of {} is {}", number, square);
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return square;
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}
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}

‎spring-ehcache/src/main/resources/application.properties

+1
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spring.cache.jcache.config=classpath:ehcache.xml

‎spring-ehcache/src/main/resources/ehcache.xml

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<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://www.ehcache.org/v3"
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xmlns:jsr107="http://www.ehcache.org/v3/jsr107"
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xsi:schemaLocation="
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http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd
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http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">
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<cache alias="squareCache">
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<key-type>java.lang.Long</key-type>
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<value-type>java.math.BigDecimal</value-type>
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<expiry>
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<ttl unit="seconds">30</ttl>
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</expiry>
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<listeners>
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<listener>
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<class>com.baeldung.cachetest.config.CacheEventLogger</class>
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<event-firing-mode>ASYNCHRONOUS</event-firing-mode>
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<event-ordering-mode>UNORDERED</event-ordering-mode>
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<events-to-fire-on>CREATED</events-to-fire-on>
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<events-to-fire-on>EXPIRED</events-to-fire-on>
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</listener>
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</listeners>
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<resources>
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<heap unit="entries">2</heap>
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<offheap unit="MB">10</offheap>
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</resources>
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</cache>
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</config>

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