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| 1 | +/** |
| 2 | + * Licensed to the Apache Software Foundation (ASF) under one |
| 3 | + * or more contributor license agreements. See the NOTICE file |
| 4 | + * distributed with this work for additional information |
| 5 | + * regarding copyright ownership. The ASF licenses this file |
| 6 | + * to you under the Apache License, Version 2.0 (the |
| 7 | + * "License"); you may not use this file except in compliance |
| 8 | + * with the License. You may obtain a copy of the License at |
| 9 | + * |
| 10 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | + * |
| 12 | + * Unless required by applicable law or agreed to in writing, |
| 13 | + * software distributed under the License is distributed on an |
| 14 | + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | + * KIND, either express or implied. See the License for the |
| 16 | + * specific language governing permissions and limitations |
| 17 | + * under the License. |
| 18 | + */ |
| 19 | +package org.apache.bookkeeper.mledger.impl.cache; |
| 20 | + |
| 21 | +import io.netty.buffer.ByteBuf; |
| 22 | +import java.util.concurrent.atomic.AtomicInteger; |
| 23 | +import org.apache.pulsar.common.allocator.PulsarByteBufAllocator; |
| 24 | +import org.apache.pulsar.common.util.collections.ConcurrentLongLongPairHashMap; |
| 25 | + |
| 26 | +class SharedCacheSegmentBufferCopy implements AutoCloseable, SharedCacheSegment { |
| 27 | + |
| 28 | + private final ByteBuf cacheBuffer; |
| 29 | + private final AtomicInteger currentOffset = new AtomicInteger(); |
| 30 | + private final ConcurrentLongLongPairHashMap index; |
| 31 | + private final int segmentSize; |
| 32 | + |
| 33 | + private static final int ALIGN_64_MASK = ~(64 - 1); |
| 34 | + |
| 35 | + SharedCacheSegmentBufferCopy(int segmentSize) { |
| 36 | + this.segmentSize = segmentSize; |
| 37 | + this.cacheBuffer = PulsarByteBufAllocator.DEFAULT.buffer(segmentSize, segmentSize); |
| 38 | + this.cacheBuffer.writerIndex(segmentSize - 1); |
| 39 | + this.index = ConcurrentLongLongPairHashMap.newBuilder() |
| 40 | + // We are going to often clear() the map, with the expectation that it's going to get filled again |
| 41 | + // immediately after. In these conditions it does not make sense to shrink it each time. |
| 42 | + .autoShrink(false) |
| 43 | + .concurrencyLevel(Runtime.getRuntime().availableProcessors() * 8) |
| 44 | + .build(); |
| 45 | + } |
| 46 | + |
| 47 | + @Override |
| 48 | + public boolean insert(long ledgerId, long entryId, ByteBuf entry) { |
| 49 | + int entrySize = entry.readableBytes(); |
| 50 | + int alignedSize = align64(entrySize); |
| 51 | + int offset = currentOffset.getAndAdd(alignedSize); |
| 52 | + |
| 53 | + if (offset + entrySize > segmentSize) { |
| 54 | + // The segment is full |
| 55 | + return false; |
| 56 | + } else { |
| 57 | + // Copy entry into read cache segment |
| 58 | + cacheBuffer.setBytes(offset, entry, entry.readerIndex(), entry.readableBytes()); |
| 59 | + long value = offset << 32 | entrySize; |
| 60 | + index.put(ledgerId, entryId, value, 0); |
| 61 | + return true; |
| 62 | + } |
| 63 | + } |
| 64 | + |
| 65 | + @Override |
| 66 | + public ByteBuf get(long ledgerId, long entryId) { |
| 67 | + long value = index.getFirstValue(ledgerId, entryId); |
| 68 | + if (value >= 0) { |
| 69 | + int offset = (int) (value >> 32); |
| 70 | + int entryLen = (int) value; |
| 71 | + |
| 72 | + ByteBuf entry = PulsarByteBufAllocator.DEFAULT.buffer(entryLen, entryLen); |
| 73 | + entry.writeBytes(cacheBuffer, offset, entryLen); |
| 74 | + return entry; |
| 75 | + } else { |
| 76 | + return null; |
| 77 | + } |
| 78 | + } |
| 79 | + |
| 80 | + @Override |
| 81 | + public int getSize() { |
| 82 | + return currentOffset.get(); |
| 83 | + } |
| 84 | + |
| 85 | + @Override |
| 86 | + public void close() { |
| 87 | + cacheBuffer.release(); |
| 88 | + } |
| 89 | + |
| 90 | + private static int align64(int size) { |
| 91 | + return (size + 64 - 1) & ALIGN_64_MASK; |
| 92 | + } |
| 93 | + |
| 94 | + @Override |
| 95 | + public void clear() { |
| 96 | + index.clear(); |
| 97 | + currentOffset.set(0); |
| 98 | + } |
| 99 | +} |
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