緩存什麼你在Spring的緩存抽象使用供應商？ （即ehcache，Guava，Hazelcast等）
看起來您在實際的緩存提供程序中缺少明確的「緩存」定義和實例。例如，使用Pivotal GemFire在Spring's Cache Abstraction一個caching provider時，你需要（在春緩存抽象又名Cache）來定義一個Region，用你上面的例子，像這樣......
<gfe:cache ...>
<gfe:replicated-region id="categories" persistent="false"...>
...
</gfe:replicated-region>
春數據的GemFire進至lookup的「緩存」當緩存應用服務|庫方法被調用，所以實際的後盾「緩存」（即的GemFire地區）必須存在，否則春緩存抽象throws an IllegalArgumentException。
因此，通過更明確的例子，我寫了下面的測試...
/*
* Copyright 2014-present the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.spring.cache;
import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.spring.cache.CachingWithConcurrentMapUsingExplicitlyNamedCachesTest.ApplicationConfiguration;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.concurrent.ConcurrentMapCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Service;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
/**
* The CachingWithConcurrentMapUsingExplicitlyNamedCachesTest class is a test suite of test cases testing the contract
* and functionality of Spring Cache Abstraction using the ConcurrentMap-based Cache Management Strategy
* with explicitly named "Caches".
*
* NOTE: when the Cache(s) [is|are] explicitly named using the ConcurrentMapCacheManager, then "dynamic" is disabled
* and corresponding the named Cache in the @Cacheable annotation of the cached service method must exist
* (or be declared). If no explicitly named Caches are provided to the ConcurrentMapManager constructor, then dynamic
* is enabled and the Cache will be created at runtime, on the fly.
*
* @author John Blum
* @see org.junit.Test
* @see org.junit.runner.RunWith
* @see org.springframework.cache.Cache
* @see org.springframework.cache.CacheManager
* @see org.springframework.cache.annotation.Cacheable
* @see org.springframework.cache.annotation.EnableCaching
* @see org.springframework.cache.concurrent.ConcurrentMapCacheManager
* @see org.springframework.context.annotation.Bean
* @see org.springframework.context.annotation.Configuration
* @see org.springframework.test.context.ContextConfiguration
* @see org.springframework.test.context.junit4.SpringJUnit4ClassRunner
* @since 1.0.0
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = ApplicationConfiguration.class)
@SuppressWarnings("unused")
public class CachingWithConcurrentMapUsingExplicitlyNamedCachesTest {
@Autowired
private NumberCategoryService numberCategoryService;
@Test
public void numberCategoryCaching() {
assertThat(numberCategoryService.isCacheMiss(), is(false));
List<NumberCategory> twoCategories = numberCategoryService.classify(2.0);
assertThat(twoCategories, is(notNullValue()));
assertThat(twoCategories.size(), is(equalTo(3)));
assertThat(twoCategories.containsAll(Arrays.asList(
NumberCategory.EVEN, NumberCategory.POSITIVE, NumberCategory.WHOLE)), is(true));
assertThat(numberCategoryService.isCacheMiss(), is(true));
List<NumberCategory> twoCategoriesAgain = numberCategoryService.classify(2.0);
assertThat(twoCategoriesAgain, is(sameInstance(twoCategories)));
assertThat(numberCategoryService.isCacheMiss(), is(false));
List<NumberCategory> negativeThreePointFiveCategories = numberCategoryService.classify(-3.5);
assertThat(negativeThreePointFiveCategories, is(notNullValue()));
assertThat(negativeThreePointFiveCategories.size(), is(equalTo(3)));
assertThat(negativeThreePointFiveCategories.containsAll(Arrays.asList(
NumberCategory.ODD, NumberCategory.NEGATIVE, NumberCategory.FLOATING)), is(true));
assertThat(numberCategoryService.isCacheMiss(), is(true));
}
@Configuration
@EnableCaching
public static class ApplicationConfiguration {
@Bean
public CacheManager cacheManager() {
//return new ConcurrentMapCacheManager("Categories");
return new ConcurrentMapCacheManager("Temporary");
}
@Bean
public NumberCategoryService numberCategoryService() {
return new NumberCategoryService();
}
}
@Service
public static class NumberCategoryService {
private volatile boolean cacheMiss;
public boolean isCacheMiss() {
boolean localCacheMiss = this.cacheMiss;
this.cacheMiss = false;
return localCacheMiss;
}
protected void setCacheMiss() {
this.cacheMiss = true;
}
@Cacheable("Categories")
public List<NumberCategory> classify(double number) {
setCacheMiss();
List<NumberCategory> categories = new ArrayList<>(3);
categories.add(isEven(number) ? NumberCategory.EVEN : NumberCategory.ODD);
categories.add(isPositive(number) ? NumberCategory.POSITIVE : NumberCategory.NEGATIVE);
categories.add(isWhole(number) ? NumberCategory.WHOLE : NumberCategory.FLOATING);
return categories;
}
protected boolean isEven(double number) {
return (isWhole(number) && Math.abs(number) % 2 == 0);
}
protected boolean isFloating(double number) {
return !isWhole(number);
}
protected boolean isNegative(double number) {
return (number < 0);
}
protected boolean isOdd(double number) {
return !isEven(number);
}
protected boolean isPositive(double number) {
return (number > 0);
}
protected boolean isWhole(double number) {
return (number == Math.floor(number));
}
}
public enum NumberCategory {
EVEN,
FLOATING,
NEGATIVE,
ODD,
POSITIVE,
WHOLE
}
}
這個測試的例子是目前設定爲扔拋出：IllegalArgumentException。如果你改變了...
return new ConcurrentMapCacheManager("Temporary");
要這個......
return new ConcurrentMapCacheManager("Categories");
然後一切都很好。
希望這可以充分說明您遇到的問題以及如何解決問題。
乾杯， 約翰