VectoredReadable (Paimon : Common 0.9.0 API)

所有已知实现类:

LocalFileIO.LocalSeekableInputStream
```
public interface VectoredReadable
```
Stream that permits vectored reading.

方法概要

所有方法实例方法抽象方法默认方法
限定符和类型	方法和说明
`default int`	`batchSizeForVectorReads()` The batch size of data read by a single parallelism.
`default int`	`minSeekForVectorReads()` The smallest reasonable seek.
`default int`	`parallelismForVectorReads()` The read parallelism for vector reads.
`int`	`pread(long position, byte[] buffer, int offset, int length)` Read up to the specified number of bytes, from a given position within a file, and return the number of bytes read.
`default void`	`preadFully(long position, byte[] buffer, int offset, int length)` Read the specified number of bytes fully, from a given position within a file.
`default void`	`readVectored(List<? extends FileRange> ranges)` Read fully a list of file ranges asynchronously from this file.

- 方法详细资料
  - pread
```
int pread(long position,
          byte[] buffer,
          int offset,
          int length)
   throws IOException
```
    Read up to the specified number of bytes, from a given position within a file, and return the number of bytes read. This does not change the current offset of a file, and is thread-safe.
    
    抛出:
    
    IOException
  - preadFully
```
default void preadFully(long position,
                        byte[] buffer,
                        int offset,
                        int length)
                 throws IOException
```
    Read the specified number of bytes fully, from a given position within a file. This does not change the current offset of a file, and is thread-safe.
    
    抛出:
    
    IOException
  - minSeekForVectorReads
```
default int minSeekForVectorReads()
```
    The smallest reasonable seek.
  - batchSizeForVectorReads
```
default int batchSizeForVectorReads()
```
    The batch size of data read by a single parallelism.
  - parallelismForVectorReads
```
default int parallelismForVectorReads()
```
    The read parallelism for vector reads.
  - readVectored
```
default void readVectored(List<? extends FileRange> ranges)
                   throws IOException
```
    Read fully a list of file ranges asynchronously from this file.
    As a result of the call, each range will have FileRange.setData(CompletableFuture) called with a future that when complete will have a ByteBuffer with the data from the file's range.
    
    抛出:
    
    IOException

接口 VectoredReadable

方法概要

方法详细资料

pread

preadFully

minSeekForVectorReads

batchSizeForVectorReads

parallelismForVectorReads

readVectored