org.apache.nutch.protocol
Interface Protocol

All Superinterfaces:

Configurable, Pluggable

public interface Protocol
extends Pluggable, Configurable

A retriever of url content. Implemented by protocol extensions.

Field Summary

static String	CHECK_BLOCKING Property name.
static String	CHECK_ROBOTS Property name.
static String	X_POINT_ID The name of the extension point.

Method Summary

ProtocolOutput	getProtocolOutput(Text url, CrawlDatum datum) Returns the Content for a fetchlist entry.
RobotRules	getRobotRules(Text url, CrawlDatum datum) Retrieve robot rules applicable for this url.

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Field Detail

X_POINT_ID

static final String X_POINT_ID

The name of the extension point.

CHECK_BLOCKING

static final String CHECK_BLOCKING

Property name. If in the current configuration this property is set to true, protocol implementations should handle "politeness" limits internally. If this is set to false, it is assumed that these limits are enforced elsewhere, and protocol implementations should not enforce them internally.

See Also:

Constant Field Values

CHECK_ROBOTS

static final String CHECK_ROBOTS

Property name. If in the current configuration this property is set to true, protocol implementations should handle robot exclusion rules internally. If this is set to false, it is assumed that these limits are enforced elsewhere, and protocol implementations should not enforce them internally.

See Also:

Constant Field Values

Method Detail

getProtocolOutput

ProtocolOutput getProtocolOutput(Text url,
                                 CrawlDatum datum)

Returns the Content for a fetchlist entry.

getRobotRules

RobotRules getRobotRules(Text url,
                         CrawlDatum datum)

Retrieve robot rules applicable for this url.

Parameters:

url - url to check

datum - page datum

Returns:

robot rules (specific for this url or default), never null