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common/src/main/java/lee/study/down/io/LargeMappedByteBuffer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package lee.study.down.io; | ||
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|
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| import java.io.Closeable; | ||
| import java.io.IOException; | ||
| import java.lang.reflect.Method; | ||
| import java.nio.ByteBuffer; | ||
| import java.nio.MappedByteBuffer; | ||
| import java.nio.channels.FileChannel; | ||
| import java.nio.channels.FileChannel.MapMode; | ||
| import java.util.LinkedList; | ||
| import java.util.List; | ||
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|
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| public class LargeMappedByteBuffer implements Closeable { | ||
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| private List<MappedByteBuffer> bufferList; | ||
| private long rawPosition; | ||
| private long position; | ||
| private long size; | ||
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| public LargeMappedByteBuffer(FileChannel fileChannel, MapMode mapMode, long position, long size) | ||
| throws IOException { | ||
| this.rawPosition = position; | ||
| this.position = position; | ||
| this.size = size; | ||
| int count = (int) Math.ceil(size / (double) Integer.MAX_VALUE); | ||
| this.bufferList = new LinkedList<>(); | ||
| long calcPos = position; | ||
| for (int i = 0; i < count; i++) { | ||
| long calcSize = i + 1 == count ? size % Integer.MAX_VALUE : Integer.MAX_VALUE; | ||
| bufferList.add(fileChannel.map(mapMode, calcPos, calcSize)); | ||
| calcPos += calcSize; | ||
| } | ||
| } | ||
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| public final void put(ByteBuffer byteBuffer) throws IOException { | ||
| try { | ||
| int index = getIndex(); | ||
| long length = byteBuffer.limit() - byteBuffer.position(); | ||
| this.position += length; | ||
| MappedByteBuffer mappedBuffer = bufferList.get(index); | ||
| if (mappedBuffer.remaining() < length) { | ||
| byte[] temp = new byte[mappedBuffer.remaining()]; | ||
| byteBuffer.get(temp); | ||
| bufferList.get(index).put(temp); | ||
| bufferList.get(index + 1).put(byteBuffer); | ||
| } else { | ||
| bufferList.get(index).put(byteBuffer); | ||
| } | ||
| } catch (Exception e) { | ||
| throw new IOException("LargeMappedByteBuffer put rawPosition-"+rawPosition+" size-"+size, e); | ||
| } | ||
| } | ||
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| private int getIndex() { | ||
| return (int) ((this.position - this.rawPosition) / Integer.MAX_VALUE); | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| try { | ||
| Class<?> clazz = Class.forName("sun.nio.ch.FileChannelImpl"); | ||
| Method m = clazz.getDeclaredMethod("unmap", MappedByteBuffer.class); | ||
| m.setAccessible(true); | ||
| for (MappedByteBuffer mappedBuffer : bufferList) { | ||
| m.invoke(clazz, mappedBuffer); | ||
| } | ||
| } catch (Exception e) { | ||
| throw new IOException("LargeMappedByteBuffer close", e); | ||
| } | ||
| } | ||
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|
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| } |
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