spring NoOpCache 源码
spring NoOpCache 代码
文件路径：/spring-context/src/main/java/org/springframework/cache/support/NoOpCache.java
/*
* Copyright 2002-2020 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
*
* https://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.springframework.cache.support;
import java.util.concurrent.Callable;
import org.springframework.cache.Cache;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* A no operation {@link Cache} implementation suitable for disabling caching.
*
* <p>Will simply accept any items into the cache not actually storing them.
*
* @author Costin Leau
* @author Stephane Nicoll
* @since 4.3.4
* @see NoOpCacheManager
*/
public class NoOpCache implements Cache {
private final String name;
/**
* Create a {@link NoOpCache} instance with the specified name.
* @param name the name of the cache
*/
public NoOpCache(String name) {
Assert.notNull(name, "Cache name must not be null");
this.name = name;
}
@Override
public String getName() {
return this.name;
}
@Override
public Object getNativeCache() {
return this;
}
@Override
@Nullable
public ValueWrapper get(Object key) {
return null;
}
@Override
@Nullable
public <T> T get(Object key, @Nullable Class<T> type) {
return null;
}
@Override
@Nullable
public <T> T get(Object key, Callable<T> valueLoader) {
try {
return valueLoader.call();
}
catch (Exception ex) {
throw new ValueRetrievalException(key, valueLoader, ex);
}
}
@Override
public void put(Object key, @Nullable Object value) {
}
@Override
@Nullable
public ValueWrapper putIfAbsent(Object key, @Nullable Object value) {
return null;
}
@Override
public void evict(Object key) {
}
@Override
public boolean evictIfPresent(Object key) {
return false;
}
@Override
public void clear() {
}
@Override
public boolean invalidate() {
return false;
}
}
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