| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.jackrabbit.oak.plugins.document.persistentCache; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.ByteBuffer; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCache.GenerationCache; |
| import org.apache.jackrabbit.oak.spi.blob.BlobOptions; |
| import org.apache.jackrabbit.oak.spi.blob.GarbageCollectableBlobStore; |
| import org.h2.mvstore.MVMap; |
| import org.h2.mvstore.StreamStore; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A persistent blob cache. Only blobs that are smaller than 10% of the maximum |
| * cache size are stored. |
| */ |
| public class BlobCache implements GarbageCollectableBlobStore, GenerationCache, Closeable { |
| |
| static final Logger LOG = LoggerFactory.getLogger(BlobCache.class); |
| |
| private final GarbageCollectableBlobStore base; |
| private final PersistentCache cache; |
| private final MultiGenerationMap<String, byte[]> meta; |
| private MultiGenerationMap<Long, byte[]> data; |
| private StreamStore streamStore; |
| private long maxEntrySize; |
| |
| public BlobCache( |
| PersistentCache cache, |
| GarbageCollectableBlobStore base) { |
| this.cache = cache; |
| this.base = base; |
| data = new MultiGenerationMap<Long, byte[]>(); |
| meta = new MultiGenerationMap<String, byte[]>(); |
| maxEntrySize = cache.getMaxBinaryEntrySize(); |
| } |
| |
| @Override |
| public CacheType getType() { |
| return CacheType.BLOB; |
| } |
| |
| @Override |
| public void addGeneration(int generation, boolean readOnly) { |
| CacheMap<Long, byte[]> d = cache.openMap(generation, "data", |
| new MVMap.Builder<Long, byte[]>()); |
| data.addReadMap(generation, d); |
| CacheMap<String, byte[]> m = cache.openMap(generation, "meta", |
| new MVMap.Builder<String, byte[]>()); |
| meta.addReadMap(generation, m); |
| if (!readOnly) { |
| // the order is important: |
| // if we switch the data first, |
| // we could end up with the data in store 1 |
| // but the metadata in store 2 - which could |
| // result in a data block not found if store 1 |
| // is removed later on |
| meta.setWriteMap(m); |
| data.setWriteMap(d); |
| } |
| if (streamStore == null) { |
| streamStore = new StreamStore(data); |
| } |
| } |
| |
| @Override |
| public void removeGeneration(int generation) { |
| data.removeReadMap(generation); |
| meta.removeReadMap(generation); |
| } |
| |
| @Override |
| public InputStream getInputStream(String blobId) throws IOException { |
| if (streamStore == null) { |
| return base.getInputStream(blobId); |
| } |
| cache.switchGenerationIfNeeded(); |
| byte[] id = meta.get(blobId); |
| if (id == null) { |
| long length = base.getBlobLength(blobId); |
| InputStream in = base.getInputStream(blobId); |
| if (length < base.getBlockSizeMin()) { |
| // in-place |
| return in; |
| } |
| if (length > maxEntrySize) { |
| // too large, don't cache |
| return in; |
| } |
| id = streamStore.put(in); |
| in.close(); |
| meta.put(blobId, id); |
| } |
| return streamStore.get(id); |
| } |
| |
| @Override |
| public String writeBlob(InputStream in) throws IOException { |
| // TODO maybe copy the binary to the cache in a background thread |
| return base.writeBlob(in); |
| } |
| |
| /** |
| * Ignores the options provided and delegates to {@link #writeBlob(InputStream)}. |
| * |
| * @param in the input stream to write |
| * @param options the options to use |
| * @return |
| * @throws IOException |
| */ |
| @Override |
| public String writeBlob(InputStream in, BlobOptions options) throws IOException { |
| return writeBlob(in); |
| } |
| |
| @Override |
| public int readBlob(String blobId, long pos, byte[] buff, int off, |
| int length) throws IOException { |
| InputStream in = getInputStream(blobId); |
| long remainingSkip = pos; |
| while (remainingSkip > 0) { |
| remainingSkip -= in.skip(remainingSkip); |
| } |
| return in.read(buff, off, length); |
| } |
| |
| @Override |
| public long getBlobLength(String blobId) throws IOException { |
| return base.getBlobLength(blobId); |
| } |
| |
| @Override |
| @Nullable |
| public String getBlobId(@NotNull String reference) { |
| return base.getBlobId(reference); |
| } |
| |
| @Override |
| @Nullable |
| public String getReference(@NotNull String blobId) { |
| return base.getReference(blobId); |
| } |
| |
| @Override |
| public void clearCache() { |
| base.clearCache(); |
| } |
| |
| @Override |
| public void clearInUse() { |
| base.clearInUse(); |
| } |
| |
| @Override |
| @Deprecated |
| public boolean deleteChunks(List<String> chunkIds, long maxLastModifiedTime) throws Exception { |
| return base.deleteChunks(chunkIds, maxLastModifiedTime); |
| } |
| |
| @Override |
| public long countDeleteChunks(List<String> chunkIds, long maxLastModifiedTime) throws Exception { |
| return base.countDeleteChunks(chunkIds, maxLastModifiedTime); |
| } |
| |
| @Override |
| public Iterator<String> getAllChunkIds(long maxLastModifiedTime) throws Exception { |
| return base.getAllChunkIds(maxLastModifiedTime); |
| } |
| |
| @Override |
| public long getBlockSizeMin() { |
| return base.getBlockSizeMin(); |
| } |
| |
| @Override |
| public Iterator<String> resolveChunks(String blobId) throws IOException { |
| return base.resolveChunks(blobId); |
| } |
| |
| @Override |
| public void setBlockSize(int x) { |
| base.setBlockSize(x); |
| } |
| |
| @Override |
| public void startMark() throws IOException { |
| base.startMark(); |
| } |
| |
| @Override |
| public int sweep() throws IOException { |
| return base.sweep(); |
| } |
| |
| @Override |
| public String writeBlob(String tempFileName) throws IOException { |
| return base.writeBlob(tempFileName); |
| } |
| |
| @Override |
| public void receive(ByteBuffer buff) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (base instanceof Closeable) { |
| ((Closeable)base).close(); |
| } |
| } |
| |
| } |