com.alipay.sofa.jraft.storage.io

接口 FileReader

所有已知实现类:

LocalDirReader, SnapshotFileReader

public interface FileReader

Read data from a file, all the method should be thread-safe.

作者:

boyan (boyan@alibaba-inc.com) 2018-Mar-13 11:48:34 AM

字段概要

字段

限定符和类型	字段和说明
static int	EOF

方法概要

限定符和类型	方法和说明
String	getPath() Get the file path.
int	readFile(ByteBufferCollector buf, String fileName, long offset, long maxCount) Read file into buf starts from offset at most maxCount.

字段详细资料

EOF

static final int EOF

另请参阅:

常量字段值

方法详细资料

getPath

String getPath()

Get the file path.

返回:

path of the file

readFile

int readFile(ByteBufferCollector buf,
             String fileName,
             long offset,
             long maxCount)
      throws IOException,
             RetryAgainException

Read file into buf starts from offset at most maxCount.

参数:

buf - read bytes into this buf

fileName - file name

offset - the offset of file

maxCount - max read bytes

返回:

-1 if reaches end, else return read count.

抛出:

IOException - if some I/O error occurs

RetryAgainException - if it's not allowed to read partly or it's allowed but throughput is throttled to 0, try again.