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/*
 * 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 io.trino.collect.cache;

import com.google.common.cache.Cache;
import com.google.common.cache.ForwardingCache;
import com.google.common.collect.ForwardingConcurrentMap;

import java.util.concurrent.ConcurrentMap;

import static java.util.Objects.requireNonNull;

// package-private. The interface provides deprecation and javadoc to help at call sites
@ElementTypesAreNonnullByDefault
class NonKeyEvictableCacheImpl
        extends ForwardingCache
        implements NonKeyEvictableCache
{
    private final Cache delegate;

    NonKeyEvictableCacheImpl(Cache delegate)
    {
        this.delegate = requireNonNull(delegate, "delegate is null");
    }

    @Override
    protected Cache delegate()
    {
        return delegate;
    }

    @Override
    public void invalidate(Object key)
    {
        throw new UnsupportedOperationException("invalidate(key) does not invalidate ongoing loads, so a stale value may remain in the cache for ever. " +
                "Use EvictableCache if you need invalidation");
    }

    @Override
    public void invalidateAll(Iterable keys)
    {
        throw new UnsupportedOperationException("invalidateAll(keys) does not invalidate ongoing loads, so a stale value may remain in the cache for ever. " +
                "Use EvictableCache if you need invalidation");
    }

    @Override
    public ConcurrentMap asMap()
    {
        ConcurrentMap map = delegate.asMap();
        return new ForwardingConcurrentMap()
        {
            @Override
            protected ConcurrentMap delegate()
            {
                return map;
            }

            @Override
            public V remove(Object key)
            {
                throw new UnsupportedOperationException("remove(key) does not invalidate ongoing loads, so a stale value may remain in the cache for ever. " +
                        "Use EvictableCacheBuilder if you need invalidation");
            }

            @Override
            public boolean remove(Object key, Object value)
            {
                // defensive forbid, it is not sure if this method is safe to call or not
                throw new UnsupportedOperationException("remove(key, value) does not invalidate ongoing loads, so a stale value may remain in the cache for ever. " +
                        "Use EvictableCacheBuilder if you need invalidation");
            }

            @Override
            public boolean replace(K key, V oldValue, V newValue)
            {
                // defensive forbid, it is not sure if this method is safe to call or not
                throw new UnsupportedOperationException("replace(key, oldValue, newValue) does not invalidate ongoing loads, so a stale value may remain in the cache for ever. " +
                        "Use EvictableCacheBuilder if you need invalidation");
            }

            @Override
            public V replace(K key, V value)
            {
                // defensive forbid, it is not sure if this method is safe to call or not
                throw new UnsupportedOperationException("replace(key, value) does not invalidate ongoing loads, so a stale value may remain in the cache for ever. " +
                        "Use EvictableCacheBuilder if you need invalidation");
            }
        };
    }
}