| // Copyright (C) 2018 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.googlesource.gerrit.modules.cache.pg; |
| |
| import com.google.common.cache.AbstractLoadingCache; |
| import com.google.common.cache.Cache; |
| import com.google.common.cache.CacheStats; |
| import com.google.common.cache.LoadingCache; |
| import com.google.gerrit.common.TimeUtil; |
| import com.google.gerrit.server.cache.PersistentCache; |
| import com.google.inject.TypeLiteral; |
| import java.time.LocalDateTime; |
| import java.time.OffsetDateTime; |
| import java.time.temporal.ChronoUnit; |
| import java.time.temporal.TemporalAdjusters; |
| import java.util.Map; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class PgCacheImpl<K, V> extends AbstractLoadingCache<K, V> implements PersistentCache { |
| private static final Logger log = LoggerFactory.getLogger(PgCacheImpl.class); |
| |
| private final String name; |
| private final Executor executor; |
| private final PgSqlStore<K, V> store; |
| private final TypeLiteral<K> keyType; |
| private final Cache<K, ValueHolder<V>> mem; |
| |
| public PgCacheImpl( |
| String name, |
| Executor executor, |
| PgSqlStore<K, V> store, |
| TypeLiteral<K> keyType, |
| Cache<K, ValueHolder<V>> mem) { |
| this.name = name; |
| this.executor = executor; |
| this.store = store; |
| this.keyType = keyType; |
| this.mem = mem; |
| } |
| |
| @Override |
| public V get(K key) throws ExecutionException { |
| if (mem instanceof LoadingCache) { |
| return ((LoadingCache<K, ValueHolder<V>>) mem).get(key).value; |
| } |
| |
| log.error("Memory cache for persistent backend {} should be of LoadingCache type", name); |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public V getIfPresent(Object objKey) { |
| if (!keyType.getRawType().isInstance(objKey)) { |
| log.warn("Invalid object key type [{}] was provided for cache {}", objKey, name); |
| return null; |
| } |
| |
| @SuppressWarnings("unchecked") |
| K key = (K) objKey; |
| |
| ValueHolder<V> h = mem.getIfPresent(key); |
| if (h != null) { |
| return h.value; |
| } |
| |
| if (store.mightContain(key)) { |
| h = store.getIfPresent(key); |
| if (h != null) { |
| mem.put(key, h); |
| return h.value; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public V get(K key, Callable<? extends V> valueLoader) throws ExecutionException { |
| return mem.get( |
| key, |
| () -> { |
| if (store.mightContain(key)) { |
| ValueHolder<V> h = store.getIfPresent(key); |
| if (h != null) { |
| return h; |
| } |
| } |
| |
| ValueHolder<V> h = new ValueHolder<>(valueLoader.call()); |
| h.created = TimeUtil.nowMs(); |
| executor.execute(() -> store.put(key, h)); |
| return h; |
| }) |
| .value; |
| } |
| |
| @Override |
| public void put(K key, V val) { |
| final ValueHolder<V> h = new ValueHolder<>(val); |
| h.created = TimeUtil.nowMs(); |
| mem.put(key, h); |
| executor.execute(() -> store.put(key, h)); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public void invalidate(Object key) { |
| if (keyType.getRawType().isInstance(key) && store.mightContain((K) key)) { |
| executor.execute(() -> store.invalidate((K) key)); |
| } |
| mem.invalidate(key); |
| } |
| |
| @Override |
| public void invalidateAll() { |
| store.invalidateAll(); |
| mem.invalidateAll(); |
| } |
| |
| @Override |
| public long size() { |
| return mem.size(); |
| } |
| |
| @Override |
| public CacheStats stats() { |
| return mem.stats(); |
| } |
| |
| @Override |
| public DiskStats diskStats() { |
| return store.diskStats(); |
| } |
| |
| void start() { |
| store.open(); |
| } |
| |
| void stop() { |
| for (Map.Entry<K, ValueHolder<V>> e : mem.asMap().entrySet()) { |
| ValueHolder<V> h = e.getValue(); |
| if (!h.clean) { |
| store.put(e.getKey(), h); |
| } |
| } |
| store.close(); |
| } |
| |
| void prune(ScheduledExecutorService service) { |
| store.prune(mem); |
| |
| long delay = |
| LocalDateTime.now() |
| .with(TemporalAdjusters.firstDayOfMonth()) |
| .withHour(01) |
| .truncatedTo(ChronoUnit.HOURS) |
| .toInstant(OffsetDateTime.now().getOffset()) |
| .minusMillis(TimeUtil.nowMs()) |
| .toEpochMilli(); |
| @SuppressWarnings("unused") |
| Future<?> possiblyIgnoredError = |
| service.schedule(() -> prune(service), delay, TimeUnit.MILLISECONDS); |
| } |
| } |