mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-05-26 05:10:56 +02:00
130 lines
3.9 KiB
Java
130 lines
3.9 KiB
Java
/*
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* Copyright 2009 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package seaweedfs.client.btree;
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import com.google.common.cache.Cache;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.collect.ImmutableSet;
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import javax.annotation.Nullable;
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import java.util.Collection;
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import java.util.Iterator;
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import java.util.LinkedHashMap;
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import java.util.Map;
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public class CachingBlockStore implements BlockStore {
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private final BlockStore store;
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private final Map<BlockPointer, BlockPayload> dirty = new LinkedHashMap<BlockPointer, BlockPayload>();
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private final Cache<BlockPointer, BlockPayload> indexBlockCache = CacheBuilder.newBuilder().maximumSize(100).concurrencyLevel(1).build();
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private final ImmutableSet<Class<? extends BlockPayload>> cacheableBlockTypes;
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public CachingBlockStore(BlockStore store, Collection<Class<? extends BlockPayload>> cacheableBlockTypes) {
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this.store = store;
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this.cacheableBlockTypes = ImmutableSet.copyOf(cacheableBlockTypes);
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}
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@Override
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public void open(Runnable initAction, Factory factory) {
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store.open(initAction, factory);
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}
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@Override
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public void close() {
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flush();
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indexBlockCache.invalidateAll();
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store.close();
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}
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@Override
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public void clear() {
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dirty.clear();
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indexBlockCache.invalidateAll();
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store.clear();
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}
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@Override
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public void flush() {
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Iterator<BlockPayload> iterator = dirty.values().iterator();
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while (iterator.hasNext()) {
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BlockPayload block = iterator.next();
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iterator.remove();
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store.write(block);
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}
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store.flush();
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}
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@Override
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public void attach(BlockPayload block) {
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store.attach(block);
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}
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@Override
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public void remove(BlockPayload block) {
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dirty.remove(block.getPos());
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if (isCacheable(block)) {
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indexBlockCache.invalidate(block.getPos());
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}
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store.remove(block);
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}
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@Override
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public <T extends BlockPayload> T readFirst(Class<T> payloadType) {
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T block = store.readFirst(payloadType);
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maybeCache(block);
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return block;
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}
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@Override
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public <T extends BlockPayload> T read(BlockPointer pos, Class<T> payloadType) {
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T block = payloadType.cast(dirty.get(pos));
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if (block != null) {
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return block;
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}
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block = maybeGetFromCache(pos, payloadType);
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if (block != null) {
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return block;
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}
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block = store.read(pos, payloadType);
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maybeCache(block);
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return block;
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}
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@Nullable
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private <T extends BlockPayload> T maybeGetFromCache(BlockPointer pos, Class<T> payloadType) {
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if (cacheableBlockTypes.contains(payloadType)) {
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return payloadType.cast(indexBlockCache.getIfPresent(pos));
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}
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return null;
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}
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@Override
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public void write(BlockPayload block) {
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store.attach(block);
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maybeCache(block);
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dirty.put(block.getPos(), block);
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}
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private <T extends BlockPayload> void maybeCache(T block) {
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if (isCacheable(block)) {
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indexBlockCache.put(block.getPos(), block);
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}
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}
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private <T extends BlockPayload> boolean isCacheable(T block) {
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return cacheableBlockTypes.contains(block.getClass());
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}
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}
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