org.apache.cayenne.cache.invalidation.CacheGroupsHandler Maven / Gradle / Ivy
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package org.apache.cayenne.cache.invalidation;
import org.apache.cayenne.Persistent;
import java.util.ArrayList;
import java.util.Collection;
import java.util.function.Function;
/**
* @since 4.0
*/
public class CacheGroupsHandler implements InvalidationHandler {
public CacheGroupsHandler() {
}
/**
* Return invalidation function that returns values
* of {@link CacheGroups} and {@link CacheGroup} annotations for the given type.
*/
@Override
public Function> canHandle(Class type) {
CacheGroup multipleCacheGroups = type.getAnnotation(CacheGroup.class);
CacheGroups cacheGroups = type.getAnnotation(CacheGroups.class);
if (cacheGroups == null && multipleCacheGroups == null) {
return null;
}
final Collection groupsList = new ArrayList<>();
extractCacheGroups(cacheGroups, groupsList);
extractCacheGroups(multipleCacheGroups, groupsList);
return p -> groupsList;
}
private void extractCacheGroups(CacheGroup cacheGroup, Collection groupsList) {
if(cacheGroup == null) {
return;
}
groupsList.add(new CacheGroupDescriptor(cacheGroup.value(), cacheGroup.keyType(), cacheGroup.valueType()));
}
private void extractCacheGroups(CacheGroups cacheGroups, Collection groupsList) {
if(cacheGroups == null) {
return;
}
for(String name : cacheGroups.value()) {
groupsList.add(new CacheGroupDescriptor(name));
}
for(CacheGroup group : cacheGroups.groups()) {
extractCacheGroups(group, groupsList);
}
}
}