net.java.ao.schema.info.CachingEntityInfoResolver Maven / Gradle / Ivy

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This is the core library for Active Objects. It is generic and can be embedded in any environment. As such it is generic and won't contain all connection pooling, etc.

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package net.java.ao.schema.info;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import net.java.ao.RawEntity;

/**
 * A {@code EntityInfoResolver} which caches the computed {@link EntityInfo} for any type it is given
 */
public class CachingEntityInfoResolver extends EntityInfoResolverWrapper implements EntityInfoResolver {

    private final LoadingCache>, EntityInfo> cache;

    public CachingEntityInfoResolver(EntityInfoResolver delegate) {
        super(delegate);
        cache = CacheBuilder.newBuilder().build(new CacheLoader>, EntityInfo>() {
            @SuppressWarnings("unchecked")
            @Override
            public EntityInfo load(Class type) throws Exception {
                return CachingEntityInfoResolver.super.resolve(type);
            }
        });
    }

    @SuppressWarnings("unchecked")
    @Override
    public , K> EntityInfo resolve(Class type) {
        return cache.getUnchecked(type);
    }

}