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Java Source Code / Java Documentation » Web Crawler » JoBo » net.matuschek.spider 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   net.matuschek.spider.HashedMemoryTaskList

HashedMemoryTaskList
public class HashedMemoryTaskList implements TaskList(Code)
Memory based implementation of the TaskList interface. Uses a LinkedList for sequential access and a HashSet for fast retrieval To be thread safe, all methods are synchronized.


author:
   Daniel Matuschek, Jo Christen, Oliver Schmidt
version:
   $Id: HashedMemoryTaskList.java,v 1.7 2004/08/09 13:07:22 matuschd Exp $*



Field Summary
public static  intDEFAULT_CAPACITY
    

Constructor Summary
public  HashedMemoryTaskList()
     Standard constructor.
public  HashedMemoryTaskList(boolean sequentialAccess)
     Constructor with sequentialAccess-flag
Parameters:
  sequentialAccess - can be set to false if the removeFirstand elementAt methods are not used.
public  HashedMemoryTaskList(boolean sequentialAccess, int initialCapacity)
     Constructor with sequentialAccess-flag and initialCapacity.
Parameters:
  sequentialAccess - can be set to false if the removeFirst
Parameters:
  initial - capacity (expected document count)and elementAt methods are not used.

Method Summary
public synchronized  voidadd(RobotTask task)
    
public synchronized  voidaddAtStart(RobotTask task)
    
public synchronized  voidclear()
    
public synchronized  booleancontains(RobotTask task)
    
public synchronized  RobotTaskelementAt(int position)
     Get the n-th element in the list.
public synchronized  booleanremove(RobotTask task)
    
public synchronized  RobotTaskremoveFirst()
     Get and remove the first element. the first task in the list.
public synchronized  intsize()
    

Field Detail
DEFAULT_CAPACITY
public static int DEFAULT_CAPACITY(Code)




Constructor Detail
HashedMemoryTaskList
public HashedMemoryTaskList()(Code)
Standard constructor. (sequentialAccess=true, initialCapacity=DEFAULT_CAPACITY)



HashedMemoryTaskList
public HashedMemoryTaskList(boolean sequentialAccess)(Code)
Constructor with sequentialAccess-flag
Parameters:
  sequentialAccess - can be set to false if the removeFirstand elementAt methods are not used. In this case, storageof a task will need less memory. This can be interesting if youhave to store lots of objects in this list.



HashedMemoryTaskList
public HashedMemoryTaskList(boolean sequentialAccess, int initialCapacity)(Code)
Constructor with sequentialAccess-flag and initialCapacity.
Parameters:
  sequentialAccess - can be set to false if the removeFirst
Parameters:
  initial - capacity (expected document count)and elementAt methods are not used. In this case, storageof a task will need less memory. This can be interesting if youhave to store lots of objects in this list.




Method Detail
add
public synchronized void add(RobotTask task)(Code)
Add a task to the end of the list
Parameters:
  task - a RobotTask object to store in the queue



addAtStart
public synchronized void addAtStart(RobotTask task)(Code)
Add a task at the beginning of list
Parameters:
  task - a RobotTask object to store in the queue



clear
public synchronized void clear()(Code)
Clean up the list, remove all objects



contains
public synchronized boolean contains(RobotTask task)(Code)
Is this robot task stored in the list ?



elementAt
public synchronized RobotTask elementAt(int position) throws ArrayIndexOutOfBoundsException(Code)
Get the n-th element in the list. Elements are numbered form 0 to size-1.
Parameters:
  position -
exception:
  ArrayIndexOutOfBoundsException - if the given position doesn'texist



remove
public synchronized boolean remove(RobotTask task)(Code)
Remove this object from the list



removeFirst
public synchronized RobotTask removeFirst() throws ArrayIndexOutOfBoundsException(Code)
Get and remove the first element. the first task in the list. This object will also be removedfrom the list.
exception:
  ArrayIndexOutOfBoundsException - if the list is empty or sequential access is not allowed



size
public synchronized int size()(Code)
Returns the number of elements in this list



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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