SendfileDataBase (Apache Tomcat 10.1.56 API Documentation)

java.lang.Object
- org.apache.tomcat.util.net.SendfileDataBase

Direct Known Subclasses:

Nio2Endpoint.SendfileData, NioEndpoint.SendfileData
```
public abstract class SendfileDataBase
extends java.lang.Object
```
Base class for sendfile operations. Tracks the file path, position, length, and keep-alive state for zero-copy file transfer to a socket.

Field Summary

Fields
Modifier and Type	Field	Description
`java.lang.String`	`fileName`	The full path to the file that contains the data to be written to the socket.
`SendfileKeepAliveState`	`keepAliveState`	Is the current request being processed on a keep-alive connection?
`long`	`length`	The number of bytes remaining to be written from the file (from the current `pos`).
`long`	`pos`	The position of the next byte in the file to be written to the socket.

Constructor Summary

Constructors
Constructor	Description
`SendfileDataBase(java.lang.String filename, long pos, long length)`	Initialise the sendfile data with the given file path, starting position, and byte count.

Method Summary
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - keepAliveState
```
public SendfileKeepAliveState keepAliveState
```
    Is the current request being processed on a keep-alive connection? This determines if the socket is closed once the send file completes or if processing continues with the next request on the connection or waiting for that next request to arrive.
  - fileName
```
public final java.lang.String fileName
```
    The full path to the file that contains the data to be written to the socket.
  - pos
```
public long pos
```
    The position of the next byte in the file to be written to the socket. This is initialised to the start point and then updated as the file is written.
  - length
```
public long length
```
    The number of bytes remaining to be written from the file (from the current pos). This is initialised to the end point - the start point and then updated as the file is written.
- Constructor Detail
  - SendfileDataBase
```
public SendfileDataBase(java.lang.String filename,
                        long pos,
                        long length)
```
    Initialise the sendfile data with the given file path, starting position, and byte count.
    
    Parameters:
    
    filename - the path to the file to send
    
    pos - the starting position within the file
    
    length - the number of bytes to send