org.apache.nutch.crawl
Class CrawlDatum

java.lang.Object
  org.apache.nutch.crawl.CrawlDatum

All Implemented Interfaces:

Cloneable, Comparable, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable

public class CrawlDatum
extends Object
implements org.apache.hadoop.io.WritableComparable, Cloneable

Nested Class Summary

static class

CrawlDatum.Comparator A Comparator optimized for CrawlDatum.

Field Summary

static String	FETCH_DIR_NAME
static String	GENERATE_DIR_NAME
static String	PARSE_DIR_NAME
static HashMap<Byte,String>	statNames
static byte	STATUS_DB_FETCHED Page was successfully fetched.
static byte	STATUS_DB_GONE Page no longer exists.
static byte	STATUS_DB_MAX Maximum value of DB-related status.
static byte	STATUS_DB_NOTMODIFIED Page was successfully fetched and found not modified.
static byte	STATUS_DB_REDIR_PERM Page permanently redirects to other page.
static byte	STATUS_DB_REDIR_TEMP Page temporarily redirects to other page.
static byte	STATUS_DB_UNFETCHED Page was not fetched yet.
static byte	STATUS_FETCH_GONE Fetching unsuccessful - page is gone.
static byte	STATUS_FETCH_MAX Maximum value of fetch-related status.
static byte	STATUS_FETCH_NOTMODIFIED Fetching successful - page is not modified.
static byte	STATUS_FETCH_REDIR_PERM Fetching permanently redirected to other page.
static byte	STATUS_FETCH_REDIR_TEMP Fetching temporarily redirected to other page.
static byte	STATUS_FETCH_RETRY Fetching unsuccessful, needs to be retried (transient errors).
static byte	STATUS_FETCH_SUCCESS Fetching was successful.
static byte	STATUS_INJECTED Page was newly injected.
static byte	STATUS_LINKED Page discovered through a link.
static byte	STATUS_SIGNATURE Page signature.

Constructor Summary

CrawlDatum()

CrawlDatum(int status, int fetchInterval)

CrawlDatum(int status, int fetchInterval, float score)

Method Summary

Object	clone()
int	compareTo(Object o) Sort by decreasing score.
boolean	equals(Object o)
int	getFetchInterval()
long	getFetchTime() Returns either the time of the last fetch, or the next fetch time, depending on whether Fetcher or CrawlDbReducer set the time.
MapWritable	getMetaData() returns a MapWritable if it was set or read in @see readFields(DataInput), returns empty map in case CrawlDatum was freshly created (lazily instantiated).
long	getModifiedTime()
byte	getRetriesSinceFetch()
float	getScore()
byte[]	getSignature()
byte	getStatus()
static String	getStatusName(byte value)
static boolean	hasDbStatus(CrawlDatum datum)
static boolean	hasFetchStatus(CrawlDatum datum)
int	hashCode()
static CrawlDatum	read(DataInput in)
void	readFields(DataInput in)
void	set(CrawlDatum that) Copy the contents of another instance into this instance.
void	setFetchInterval(float fetchInterval)
void	setFetchInterval(int fetchInterval)
void	setFetchTime(long fetchTime) Sets either the time of the last fetch or the next fetch time, depending on whether Fetcher or CrawlDbReducer set the time.
void	setMetaData(MapWritable mapWritable)
void	setModifiedTime(long modifiedTime)
void	setRetriesSinceFetch(int retries)
void	setScore(float score)
void	setSignature(byte[] signature)
void	setStatus(int status)
String	toString()
void	write(DataOutput out)

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

GENERATE_DIR_NAME

public static final String GENERATE_DIR_NAME

See Also:

Constant Field Values

FETCH_DIR_NAME

public static final String FETCH_DIR_NAME

See Also:

Constant Field Values

PARSE_DIR_NAME

public static final String PARSE_DIR_NAME

See Also:

Constant Field Values

STATUS_DB_UNFETCHED

public static final byte STATUS_DB_UNFETCHED

Page was not fetched yet.

See Also:

Constant Field Values

STATUS_DB_FETCHED

public static final byte STATUS_DB_FETCHED

Page was successfully fetched.

See Also:

Constant Field Values

STATUS_DB_GONE

public static final byte STATUS_DB_GONE

Page no longer exists.

See Also:

Constant Field Values

STATUS_DB_REDIR_TEMP

public static final byte STATUS_DB_REDIR_TEMP

Page temporarily redirects to other page.

See Also:

Constant Field Values

STATUS_DB_REDIR_PERM

public static final byte STATUS_DB_REDIR_PERM

Page permanently redirects to other page.

See Also:

Constant Field Values

STATUS_DB_NOTMODIFIED

public static final byte STATUS_DB_NOTMODIFIED

Page was successfully fetched and found not modified.

See Also:

Constant Field Values

STATUS_DB_MAX

public static final byte STATUS_DB_MAX

Maximum value of DB-related status.

See Also:

Constant Field Values

STATUS_FETCH_SUCCESS

public static final byte STATUS_FETCH_SUCCESS

Fetching was successful.

See Also:

Constant Field Values

STATUS_FETCH_RETRY

public static final byte STATUS_FETCH_RETRY

Fetching unsuccessful, needs to be retried (transient errors).

See Also:

Constant Field Values

STATUS_FETCH_REDIR_TEMP

public static final byte STATUS_FETCH_REDIR_TEMP

Fetching temporarily redirected to other page.

See Also:

Constant Field Values

STATUS_FETCH_REDIR_PERM

public static final byte STATUS_FETCH_REDIR_PERM

Fetching permanently redirected to other page.

See Also:

Constant Field Values

STATUS_FETCH_GONE

public static final byte STATUS_FETCH_GONE

Fetching unsuccessful - page is gone.

See Also:

Constant Field Values

STATUS_FETCH_NOTMODIFIED

public static final byte STATUS_FETCH_NOTMODIFIED

Fetching successful - page is not modified.

See Also:

Constant Field Values

STATUS_FETCH_MAX

public static final byte STATUS_FETCH_MAX

Maximum value of fetch-related status.

See Also:

Constant Field Values

STATUS_SIGNATURE

public static final byte STATUS_SIGNATURE

Page signature.

See Also:

Constant Field Values

STATUS_INJECTED

public static final byte STATUS_INJECTED

Page was newly injected.

See Also:

Constant Field Values

STATUS_LINKED

public static final byte STATUS_LINKED

Page discovered through a link.

See Also:

Constant Field Values

statNames

public static final HashMap<Byte,String> statNames

Constructor Detail

CrawlDatum

public CrawlDatum()

CrawlDatum

public CrawlDatum(int status,
                  int fetchInterval)

CrawlDatum

public CrawlDatum(int status,
                  int fetchInterval,
                  float score)

Method Detail

hasDbStatus

public static boolean hasDbStatus(CrawlDatum datum)

hasFetchStatus

public static boolean hasFetchStatus(CrawlDatum datum)

getStatus

public byte getStatus()

getStatusName

public static String getStatusName(byte value)

setStatus

public void setStatus(int status)

getFetchTime

public long getFetchTime()

Returns either the time of the last fetch, or the next fetch time, depending on whether Fetcher or CrawlDbReducer set the time.

setFetchTime

public void setFetchTime(long fetchTime)

Sets either the time of the last fetch or the next fetch time, depending on whether Fetcher or CrawlDbReducer set the time.

getModifiedTime

public long getModifiedTime()

setModifiedTime

public void setModifiedTime(long modifiedTime)

getRetriesSinceFetch

public byte getRetriesSinceFetch()

setRetriesSinceFetch

public void setRetriesSinceFetch(int retries)

getFetchInterval

public int getFetchInterval()

setFetchInterval

public void setFetchInterval(int fetchInterval)

setFetchInterval

public void setFetchInterval(float fetchInterval)

getScore

public float getScore()

setScore

public void setScore(float score)

getSignature

public byte[] getSignature()

setSignature

public void setSignature(byte[] signature)

setMetaData

public void setMetaData(MapWritable mapWritable)

getMetaData

public MapWritable getMetaData()

returns a MapWritable if it was set or read in @see readFields(DataInput), returns empty map in case CrawlDatum was freshly created (lazily instantiated).

read

public static CrawlDatum read(DataInput in)
                       throws IOException

Throws:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException

set

public void set(CrawlDatum that)

Copy the contents of another instance into this instance.

compareTo

public int compareTo(Object o)

Sort by decreasing score.

Specified by:

compareTo in interface Comparable

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

clone

public Object clone()

Overrides:

clone in class Object