us.codecraft.webmagic.downloader

Interface Downloader

All Known Implementing Classes:

AbstractDownloader, HttpClientDownloader

public interface Downloader

Downloader is the part that downloads web pages and store in Page object.
Downloader has setThread(int) method because downloader is always the bottleneck of a crawler, there are always some mechanisms such as pooling in downloader, and pool size is related to thread numbers.

Since:

0.1.0

Author:

code4crafter@gmail.com

Method Summary

Modifier and Type	Method and Description
Page	download(Request request, Task task) Downloads web pages and store in Page object.
void	setThread(int threadNum) Tell the downloader how many threads the spider used.

Method Detail

download

Page download(Request request,
              Task task)

Downloads web pages and store in Page object.

Parameters:

request - request

task - task

Returns:

page

setThread

void setThread(int threadNum)

Tell the downloader how many threads the spider used.

Parameters:

threadNum - number of threads