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| 1 | +package com.dtstack.chunjun.connector.doris.buffer; |
| 2 | + |
| 3 | +import io.airlift.slice.Slice; |
| 4 | +import io.airlift.slice.Slices; |
| 5 | +import org.slf4j.Logger; |
| 6 | +import org.slf4j.LoggerFactory; |
| 7 | + |
| 8 | +import java.util.concurrent.atomic.AtomicInteger; |
| 9 | +import java.util.concurrent.locks.ReentrantLock; |
| 10 | +import java.util.function.Consumer; |
| 11 | + |
| 12 | +import static java.nio.charset.StandardCharsets.UTF_8; |
| 13 | + |
| 14 | +class BufferPool implements IBufferPool { |
| 15 | + private static final Logger LOG = LoggerFactory.getLogger(BufferPool.class); |
| 16 | + private static final byte OPEN_BRACKET = 0x5B; // [ |
| 17 | + private static final byte COMMA = 0x2C; // , |
| 18 | + private static final byte CLOSE_BRACKET = 0x5D; // ] |
| 19 | + |
| 20 | + private final int capacity; |
| 21 | + private volatile int position; |
| 22 | + private volatile BufferState state; |
| 23 | + private final ReentrantLock writeLock = new ReentrantLock(); |
| 24 | + private final int bufferId; |
| 25 | + private final AtomicInteger writeCount = new AtomicInteger(0); |
| 26 | + private final BufferFlusher flusher;; |
| 27 | + private final Consumer<Long> numWriterCount; |
| 28 | + private final Consumer<Long> bytesWriterCount; |
| 29 | + |
| 30 | + private Slice slice; |
| 31 | + |
| 32 | + public enum BufferState { |
| 33 | + AVAILABLE, // 可用状态 |
| 34 | + WRITING, // 正在写入 |
| 35 | + FLUSHING, // 正在刷写 |
| 36 | + FULL // 已满待刷写 |
| 37 | + } |
| 38 | + |
| 39 | + public BufferPool( |
| 40 | + int capacity, |
| 41 | + int bufferId, |
| 42 | + BufferFlusher flusher, |
| 43 | + Consumer<Long> numWriterCount, |
| 44 | + Consumer<Long> bytesWriterCount) { |
| 45 | + this.capacity = capacity; |
| 46 | + this.slice = Slices.allocate(capacity); |
| 47 | + this.position = 0; |
| 48 | + this.bufferId = bufferId; |
| 49 | + this.flusher = flusher; |
| 50 | + this.numWriterCount = numWriterCount; |
| 51 | + this.bytesWriterCount = bytesWriterCount; |
| 52 | + this.reset(); |
| 53 | + } |
| 54 | + |
| 55 | + /** |
| 56 | + * 写入数据到缓冲区 |
| 57 | + * |
| 58 | + * @param data 要写入的数据 |
| 59 | + * @return 实际写入的字节数，-1表示缓冲区已满 |
| 60 | + */ |
| 61 | + public int write(byte[] data) { |
| 62 | + writeLock.lock(); |
| 63 | + try { |
| 64 | + return write(Slices.wrappedBuffer(data)); |
| 65 | + } finally { |
| 66 | + writeLock.unlock(); |
| 67 | + } |
| 68 | + } |
| 69 | + |
| 70 | + /** |
| 71 | + * 写入数据到缓冲区 |
| 72 | + * |
| 73 | + * @param data 要写入的数据 |
| 74 | + * @return 实际写入的字节数，-1表示缓冲区已满 |
| 75 | + */ |
| 76 | + public int write(String data) { |
| 77 | + writeLock.lock(); |
| 78 | + try { |
| 79 | + return write(Slices.copiedBuffer(data, UTF_8)); |
| 80 | + } finally { |
| 81 | + writeLock.unlock(); |
| 82 | + } |
| 83 | + } |
| 84 | + |
| 85 | + @Override |
| 86 | + public void flush() throws Exception { |
| 87 | + writeLock.lock(); |
| 88 | + try { |
| 89 | + if (position > 1) { |
| 90 | + state = BufferState.FLUSHING; |
| 91 | + replaceLastCommonToClosingBracket(); |
| 92 | + LOG.info( |
| 93 | + "小缓冲区 {} 刷写数据，数据总量 {} MB，条数：{}", |
| 94 | + bufferId, |
| 95 | + (int) Math.ceil((double) position / (1024 * 1024)), |
| 96 | + writeCount.get()); |
| 97 | + numWriterCount.accept((long) writeCount.get()); |
| 98 | + bytesWriterCount.accept((long) position); |
| 99 | + Slice output = slice.slice(0, position); |
| 100 | + LOG.info("开始异步刷写缓冲区 {}，数据大小：{} 字节", this.bufferId, position); |
| 101 | + // 执行实际的刷写操作 |
| 102 | + flusher.write(output::getInput, position); |
| 103 | + LOG.info("缓冲区 {} 刷写完成，数据大小：{} 字节", this.bufferId, position); |
| 104 | + // 刷写完成后重置缓冲区并放回可用队列 |
| 105 | + this.reset(); |
| 106 | + } |
| 107 | + } finally { |
| 108 | + writeLock.unlock(); |
| 109 | + } |
| 110 | + } |
| 111 | + |
| 112 | + @Override |
| 113 | + public void shutdown() throws Exception { |
| 114 | + this.flush(); |
| 115 | + this.slice.clear(); |
| 116 | + this.slice = null; |
| 117 | + } |
| 118 | + |
| 119 | + /** |
| 120 | + * 写入数据到缓冲区 |
| 121 | + * |
| 122 | + * @param data 要写入的数据 |
| 123 | + * @return 实际写入的字节数，-1表示缓冲区已满 |
| 124 | + */ |
| 125 | + public int write(Slice data) { |
| 126 | + writeLock.lock(); |
| 127 | + try { |
| 128 | + if (state != BufferState.WRITING && state != BufferState.AVAILABLE) { |
| 129 | + return -1; // 缓冲区不可写 |
| 130 | + } |
| 131 | + |
| 132 | + int availableSpace = capacity - position; |
| 133 | + if (availableSpace <= 0) { |
| 134 | + state = BufferState.FULL; |
| 135 | + return -1; // 缓冲区已满 |
| 136 | + } |
| 137 | + |
| 138 | + if (data.length() + 1 + position > capacity) { |
| 139 | + state = BufferState.FULL; |
| 140 | + return -1; // 数据无法存入缓冲区 |
| 141 | + } |
| 142 | + |
| 143 | + state = BufferState.WRITING; |
| 144 | + int bytesToWrite = data.length(); |
| 145 | + slice.setBytes(position, data); |
| 146 | + position += bytesToWrite; |
| 147 | + slice.setByte(position, COMMA); |
| 148 | + position += 1; |
| 149 | + writeCount.incrementAndGet(); |
| 150 | + |
| 151 | + if (position >= capacity) { |
| 152 | + state = BufferState.FULL; |
| 153 | + } |
| 154 | + |
| 155 | + return bytesToWrite; |
| 156 | + } finally { |
| 157 | + writeLock.unlock(); |
| 158 | + } |
| 159 | + } |
| 160 | + |
| 161 | + // [{},{}, => [{},{}] |
| 162 | + private void replaceLastCommonToClosingBracket() { |
| 163 | + if (state == BufferState.FLUSHING) { |
| 164 | + slice.setByte(position - 1, CLOSE_BRACKET); |
| 165 | + } |
| 166 | + } |
| 167 | + |
| 168 | + /** 刷写完成后重置缓冲区 */ |
| 169 | + public void reset() { |
| 170 | + writeLock.lock(); |
| 171 | + try { |
| 172 | + slice.setByte(0, OPEN_BRACKET); |
| 173 | + position = 1; |
| 174 | + writeCount.set(0); |
| 175 | + state = BufferState.AVAILABLE; |
| 176 | + LOG.info("SmallBuffer " + bufferId + " 已重置为可用状态"); |
| 177 | + } finally { |
| 178 | + writeLock.unlock(); |
| 179 | + } |
| 180 | + } |
| 181 | + |
| 182 | + public BufferState getState() { |
| 183 | + return state; |
| 184 | + } |
| 185 | + |
| 186 | + public int getBufferId() { |
| 187 | + return bufferId; |
| 188 | + } |
| 189 | + |
| 190 | + public int getPosition() { |
| 191 | + return position; |
| 192 | + } |
| 193 | + |
| 194 | + public int getCapacity() { |
| 195 | + return capacity; |
| 196 | + } |
| 197 | +} |
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