com.liulishuo.filedownloader.connection

Class DefaultConnectionCountAdapter

java.lang.Object

com.liulishuo.filedownloader.connection.DefaultConnectionCountAdapter

All Implemented Interfaces:

FileDownloadHelper.ConnectionCountAdapter

public class DefaultConnectionCountAdapter
extends Object
implements FileDownloadHelper.ConnectionCountAdapter

The default connection count adapter.

Constructor Summary

Constructors

Constructor and Description
DefaultConnectionCountAdapter()

Method Summary

Modifier and Type	Method and Description
int	determineConnectionCount(int downloadId, String url, String path, long totalLength) Before invoke this method to determine how many connection will be used to downloading this task, there are several conditions must be confirmed:

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultConnectionCountAdapter

public DefaultConnectionCountAdapter()

Method Detail

determineConnectionCount

public int determineConnectionCount(int downloadId,
                                    String url,
                                    String path,
                                    long totalLength)

Description copied from interface: FileDownloadHelper.ConnectionCountAdapter

Before invoke this method to determine how many connection will be used to downloading this task, there are several conditions must be confirmed:

1. the connection is support multiple connection(SUPPORT"Partial Content(206)" AND NOT Chunked) 2. the current FileDownloadOutputStream support seek(The default one(FileDownloadRandomAccessFile is support) 3. this is a new task NOT resume from breakpoint( If the task resume from breakpoint the connection count would be using the one you determined when the task first created ).

The best strategy is refer to how much speed of each connection for the ip:port not file size.

Specified by:

determineConnectionCount in interface FileDownloadHelper.ConnectionCountAdapter

Parameters:

downloadId - the download id.

url - the task url.

path - the task path.

totalLength - the total length of the file.

Returns:

the count of connection you want for the task. the value must be large than 0.