spider.crawl
Class Frontier

java.lang.Object
  |
  +--spider.crawl.Frontier

public class Frontier

extends java.lang.Object

Author:

Gautam Pant The frontier (priority queue) implementation. The methods are synchronized in order to allow multi-threaded acces

Constructor Summary

Frontier(Cache c)
if no size is specified, then set up a flag for unlimited frontier

Frontier(int max_size, Cache c)

Method Summary

boolean	addElements(java.util.Vector fes) Adds a set of elements to the frontier given a sorted list of urls (sorted by score) The function allows optimization of code when many URLs need to be added returns true unless Exception is caught - omitted for now
FrontierElement	getElement() get the top frontier element (according to priority) and delete it
int	getMaxSize() get max size
int	size() get current frontier size
java.lang.String	toString() a string version of the frontier's current state

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Frontier

public Frontier(int max_size,
                Cache c)

Frontier

public Frontier(Cache c)

if no size is specified, then set up a flag for unlimited frontier

Method Detail

addElements

public boolean addElements(java.util.Vector fes)

Adds a set of elements to the frontier given a sorted list of urls (sorted by score) The function allows optimization of code when many URLs need to be added returns true unless Exception is caught - omitted for now

getElement

public FrontierElement getElement()

get the top frontier element (according to priority) and delete it

size

public int size()

get current frontier size

getMaxSize

public int getMaxSize()

get max size

toString

public java.lang.String toString()

a string version of the frontier's current state

Overrides:

toString in class java.lang.Object