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// Copyright (C) 2022 The Android Open Source Project
//
// 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 com.google.gerrit.server.cache.mem;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.CacheLoader.UnsupportedLoadingOperationException;
import com.google.common.cache.CacheStats;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.ImmutableMap;
import com.google.gerrit.common.Nullable;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;
/** Implementation of a NOOP cache that just passes all gets to the loader */
public class PassthroughLoadingCache<K, V> implements LoadingCache<K, V> {
private final CacheLoader<? super K, V> cacheLoader;
public PassthroughLoadingCache(CacheLoader<? super K, V> cacheLoader) {
this.cacheLoader = cacheLoader;
}
@Override
public @Nullable V getIfPresent(Object key) {
return null;
}
@Override
public V get(K key, Callable<? extends V> loader) throws ExecutionException {
try {
return loader.call();
} catch (Exception e) {
throw new ExecutionException(e);
}
}
@Override
public ImmutableMap<K, V> getAllPresent(Iterable<?> keys) {
return ImmutableMap.of();
}
@Override
public void put(K key, V value) {}
@Override
public void putAll(Map<? extends K, ? extends V> m) {}
@Override
public void invalidate(Object key) {}
@Override
public void invalidateAll(Iterable<?> keys) {}
@Override
public void invalidateAll() {}
@Override
public long size() {
return 0;
}
@Override
public CacheStats stats() {
return new CacheStats(0, 0, 0, 0, 0, 0);
}
@Override
public void cleanUp() {}
@Override
public V get(K key) throws ExecutionException {
try {
return cacheLoader.load(key);
} catch (Exception e) {
throw new ExecutionException(e);
}
}
@Override
public V getUnchecked(K key) {
try {
return cacheLoader.load(key);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
@Override
public ImmutableMap<K, V> getAll(Iterable<? extends K> keys) throws ExecutionException {
try {
try {
return getAllBulk(keys);
} catch (UnsupportedLoadingOperationException e) {
return getAllIndividually(keys);
}
} catch (Exception e) {
throw new ExecutionException(e);
}
}
private ImmutableMap<K, V> getAllIndividually(Iterable<? extends K> keys) throws Exception {
ImmutableMap.Builder<K, V> builder = ImmutableMap.builder();
for (K k : keys) {
builder.put(k, cacheLoader.load(k));
}
return builder.build();
}
@SuppressWarnings("unchecked")
public ImmutableMap<K, V> getAllBulk(Iterable<? extends K> keys) throws Exception {
return (ImmutableMap<K, V>) cacheLoader.loadAll(keys);
}
@Override
public V apply(K key) {
return getUnchecked(key);
}
@Override
public void refresh(K key) {}
@Override
public ConcurrentMap<K, V> asMap() {
return new ConcurrentHashMap<>();
}
}
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