/*
* Copyright 2002-2017 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.springframework.cache.annotation;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import org.springframework.cache.interceptor.CacheEvictOperation;
import org.springframework.cache.interceptor.CacheOperation;
import org.springframework.cache.interceptor.CachePutOperation;
import org.springframework.cache.interceptor.CacheableOperation;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
/**
* Strategy implementation for parsing Spring's {@link Caching}, {@link Cacheable},
* {@link CacheEvict}, and {@link CachePut} annotations.
*
* @author Costin Leau
* @author Juergen Hoeller
* @author Chris Beams
* @author Phillip Webb
* @author Stephane Nicoll
* @author Sam Brannen
* @since 3.1
*/
@SuppressWarnings("serial")
public class SpringCacheAnnotationParser implements CacheAnnotationParser, Serializable {
@Override
public Collection<CacheOperation> parseCacheAnnotations(Class<?> type) {
DefaultCacheConfig defaultConfig = getDefaultCacheConfig(type);
return parseCacheAnnotations(defaultConfig, type);
}
@Override
public Collection<CacheOperation> parseCacheAnnotations(Method method) {
DefaultCacheConfig defaultConfig = getDefaultCacheConfig(method.getDeclaringClass());
return parseCacheAnnotations(defaultConfig, method);
}
protected Collection<CacheOperation> parseCacheAnnotations(DefaultCacheConfig cachingConfig, AnnotatedElement ae) {
Collection<CacheOperation> ops = parseCacheAnnotations(cachingConfig, ae, false);
if (ops != null && ops.size() > 1 && ae.getAnnotations().length > 0) {
// More than one operation found -> local declarations override interface-declared ones...
Collection<CacheOperation> localOps = parseCacheAnnotations(cachingConfig, ae, true);
if (localOps != null) {
return localOps;
}
}
return ops;
}
private Collection<CacheOperation> parseCacheAnnotations(
DefaultCacheConfig cachingConfig, AnnotatedElement ae, boolean localOnly) {
Collection<CacheOperation> ops = null;
Collection<Cacheable> cacheables = (localOnly ? AnnotatedElementUtils.getAllMergedAnnotations(ae, Cacheable.class) :
AnnotatedElementUtils.findAllMergedAnnotations(ae, Cacheable.class));
if (!cacheables.isEmpty()) {
ops = lazyInit(ops);
for (Cacheable cacheable : cacheables) {
ops.add(parseCacheableAnnotation(ae, cachingConfig, cacheable));
}
}
Collection<CacheEvict> evicts = (localOnly ? AnnotatedElementUtils.getAllMergedAnnotations(ae, CacheEvict.class) :
AnnotatedElementUtils.findAllMergedAnnotations(ae, CacheEvict.class));
if (!evicts.isEmpty()) {
ops = lazyInit(ops);
for (CacheEvict evict : evicts) {
ops.add(parseEvictAnnotation(ae, cachingConfig, evict));
}
}
Collection<CachePut> puts = (localOnly ? AnnotatedElementUtils.getAllMergedAnnotations(ae, CachePut.class) :
AnnotatedElementUtils.findAllMergedAnnotations(ae, CachePut.class));
if (!puts.isEmpty()) {
ops = lazyInit(ops);
for (CachePut put : puts) {
ops.add(parsePutAnnotation(ae, cachingConfig, put));
}
}
Collection<Caching> cachings = (localOnly ? AnnotatedElementUtils.getAllMergedAnnotations(ae, Caching.class) :
AnnotatedElementUtils.findAllMergedAnnotations(ae, Caching.class));
if (!cachings.isEmpty()) {
ops = lazyInit(ops);
for (Caching caching : cachings) {
Collection<CacheOperation> cachingOps = parseCachingAnnotation(ae, cachingConfig, caching);
if (cachingOps != null) {
ops.addAll(cachingOps);
}
}
}
return ops;
}
private <T extends Annotation> Collection<CacheOperation> lazyInit(Collection<CacheOperation> ops) {
return (ops != null ? ops : new ArrayList<>(1));
}
CacheableOperation parseCacheableAnnotation(AnnotatedElement ae, DefaultCacheConfig defaultConfig, Cacheable cacheable) {
CacheableOperation.Builder builder = new CacheableOperation.Builder();
builder.setName(ae.toString());
builder.setCacheNames(cacheable.cacheNames());
builder.setCondition(cacheable.condition());
builder.setUnless(cacheable.unless());
builder.setKey(cacheable.key());
builder.setKeyGenerator(cacheable.keyGenerator());
builder.setCacheManager(cacheable.cacheManager());
builder.setCacheResolver(cacheable.cacheResolver());
builder.setSync(cacheable.sync());
defaultConfig.applyDefault(builder);
CacheableOperation op = builder.build();
validateCacheOperation(ae, op);
return op;
}
CacheEvictOperation parseEvictAnnotation(AnnotatedElement ae, DefaultCacheConfig defaultConfig, CacheEvict cacheEvict) {
CacheEvictOperation.Builder builder = new CacheEvictOperation.Builder();
builder.setName(ae.toString());
builder.setCacheNames(cacheEvict.cacheNames());
builder.setCondition(cacheEvict.condition());
builder.setKey(cacheEvict.key());
builder.setKeyGenerator(cacheEvict.keyGenerator());
builder.setCacheManager(cacheEvict.cacheManager());
builder.setCacheResolver(cacheEvict.cacheResolver());
builder.setCacheWide(cacheEvict.allEntries());
builder.setBeforeInvocation(cacheEvict.beforeInvocation());
defaultConfig.applyDefault(builder);
CacheEvictOperation op = builder.build();
validateCacheOperation(ae, op);
return op;
}
CacheOperation parsePutAnnotation(AnnotatedElement ae, DefaultCacheConfig defaultConfig, CachePut cachePut) {
CachePutOperation.Builder builder = new CachePutOperation.Builder();
builder.setName(ae.toString());
builder.setCacheNames(cachePut.cacheNames());
builder.setCondition(cachePut.condition());
builder.setUnless(cachePut.unless());
builder.setKey(cachePut.key());
builder.setKeyGenerator(cachePut.keyGenerator());
builder.setCacheManager(cachePut.cacheManager());
builder.setCacheResolver(cachePut.cacheResolver());
defaultConfig.applyDefault(builder);
CachePutOperation op = builder.build();
validateCacheOperation(ae, op);
return op;
}
Collection<CacheOperation> parseCachingAnnotation(AnnotatedElement ae, DefaultCacheConfig defaultConfig, Caching caching) {
Collection<CacheOperation> ops = null;
Cacheable[] cacheables = caching.cacheable();
if (!ObjectUtils.isEmpty(cacheables)) {
ops = lazyInit(ops);
for (Cacheable cacheable : cacheables) {
ops.add(parseCacheableAnnotation(ae, defaultConfig, cacheable));
}
}
CacheEvict[] cacheEvicts = caching.evict();
if (!ObjectUtils.isEmpty(cacheEvicts)) {
ops = lazyInit(ops);
for (CacheEvict cacheEvict : cacheEvicts) {
ops.add(parseEvictAnnotation(ae, defaultConfig, cacheEvict));
}
}
CachePut[] cachePuts = caching.put();
if (!ObjectUtils.isEmpty(cachePuts)) {
ops = lazyInit(ops);
for (CachePut cachePut : cachePuts) {
ops.add(parsePutAnnotation(ae, defaultConfig, cachePut));
}
}
return ops;
}
/**
* Provides the {@link DefaultCacheConfig} instance for the specified {@link Class}.
* @param target the class-level to handle
* @return the default config (never {@code null})
*/
DefaultCacheConfig getDefaultCacheConfig(Class<?> target) {
CacheConfig annotation = AnnotatedElementUtils.findMergedAnnotation(target, CacheConfig.class);
if (annotation != null) {
return new DefaultCacheConfig(annotation.cacheNames(), annotation.keyGenerator(),
annotation.cacheManager(), annotation.cacheResolver());
}
return new DefaultCacheConfig();
}
/**
* Validates the specified {@link CacheOperation}.
* <p>Throws an {@link IllegalStateException} if the state of the operation is
* invalid. As there might be multiple sources for default values, this ensure
* that the operation is in a proper state before being returned.
* @param ae the annotated element of the cache operation
* @param operation the {@link CacheOperation} to validate
*/
private void validateCacheOperation(AnnotatedElement ae, CacheOperation operation) {
if (StringUtils.hasText(operation.getKey()) && StringUtils.hasText(operation.getKeyGenerator())) {
throw new IllegalStateException("Invalid cache annotation configuration on '" +
ae.toString() + "'. Both 'key' and 'keyGenerator' attributes have been set. " +
"These attributes are mutually exclusive: either set the SpEL expression used to" +
"compute the key at runtime or set the name of the KeyGenerator bean to use.");
}
if (StringUtils.hasText(operation.getCacheManager()) && StringUtils.hasText(operation.getCacheResolver())) {
throw new IllegalStateException("Invalid cache annotation configuration on '" +
ae.toString() + "'. Both 'cacheManager' and 'cacheResolver' attributes have been set. " +
"These attributes are mutually exclusive: the cache manager is used to configure a" +
"default cache resolver if none is set. If a cache resolver is set, the cache manager" +
"won't be used.");
}
}
@Override
public boolean equals(Object other) {
return (this == other || other instanceof SpringCacheAnnotationParser);
}
@Override
public int hashCode() {
return SpringCacheAnnotationParser.class.hashCode();
}
/**
* Provides default settings for a given set of cache operations.
*/
static class DefaultCacheConfig {
private final String[] cacheNames;
private final String keyGenerator;
private final String cacheManager;
private final String cacheResolver;
public DefaultCacheConfig() {
this(null, null, null, null);
}
private DefaultCacheConfig(String[] cacheNames, String keyGenerator, String cacheManager, String cacheResolver) {
this.cacheNames = cacheNames;
this.keyGenerator = keyGenerator;
this.cacheManager = cacheManager;
this.cacheResolver = cacheResolver;
}
/**
* Apply the defaults to the specified {@link CacheOperation.Builder}.
* @param builder the operation builder to update
*/
public void applyDefault(CacheOperation.Builder builder) {
if (builder.getCacheNames().isEmpty() && this.cacheNames != null) {
builder.setCacheNames(this.cacheNames);
}
if (!StringUtils.hasText(builder.getKey()) && !StringUtils.hasText(builder.getKeyGenerator()) &&
StringUtils.hasText(this.keyGenerator)) {
builder.setKeyGenerator(this.keyGenerator);
}
if (StringUtils.hasText(builder.getCacheManager()) || StringUtils.hasText(builder.getCacheResolver())) {
// One of these is set so we should not inherit anything
}
else if (StringUtils.hasText(this.cacheResolver)) {
builder.setCacheResolver(this.cacheResolver);
}
else if (StringUtils.hasText(this.cacheManager)) {
builder.setCacheManager(this.cacheManager);
}
}
}
}