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org.roller.business.castor
Class DatabasePool  

java.lang.Object
  org.roller.business.castor.DatabasePool

All Implemented Interfaces:

java.lang.Runnable

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public class DatabasePool

extends java.lang.Object

implements java.lang.Runnable

A class for preallocating, recycling, and managing connections. Adapted for handling JDO Database objects rather than connections. Taken from Core Servlets and JavaServer Pages from Prentice Hall and Sun Microsystems Press, http://www.coreservlets.com/. © 2000 Marty Hall; may be freely used or adapted.

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Field Summary
private  java.util.Vector	availableConnections
private  java.util.Vector	busyConnections
private  boolean	connectionPending
private  int	maxConnections
protected  JDO	mJDO
private  boolean	waitIfBusy

 

Constructor Summary

DatabasePool(JDO jdo, int initialConnections, int maxConnections, boolean waitIfBusy)

 

Method Summary
void	closeAllConnections()           Close all the connections.
private  void	closeConnections(java.util.Vector connections)
void	free(Database connection)
Database	getConnection()
private  void	makeBackgroundConnection()
private  Database	makeNewConnection()
void	run()           This method will be called by whoever wishes to run your class implementing Runnable.
java.lang.String	toString()           Convert this Object to a human-readable String.
int	totalConnections()

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Field Detail

mJDO

protected transient JDO mJDO

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maxConnections

private int maxConnections

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waitIfBusy

private boolean waitIfBusy

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availableConnections

private java.util.Vector availableConnections

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busyConnections

private java.util.Vector busyConnections

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connectionPending

private boolean connectionPending

Constructor Detail

DatabasePool

public DatabasePool(JDO jdo,
                    int initialConnections,
                    int maxConnections,
                    boolean waitIfBusy)
             throws java.lang.Exception

Method Detail

getConnection

public Database getConnection()
                       throws java.lang.Exception

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makeBackgroundConnection

private void makeBackgroundConnection()

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run

public void run()

Description copied from interface: java.lang.Runnable

This method will be called by whoever wishes to run your class implementing Runnable. Note that there are no restrictions on what you are allowed to do in the run method, except that you cannot throw a checked exception.

Specified by:

run in interface java.lang.Runnable

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makeNewConnection

private Database makeNewConnection()
                            throws java.lang.Exception

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free

public void free(Database connection)

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totalConnections

public int totalConnections()

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closeAllConnections

public void closeAllConnections()

Close all the connections. Use with caution: be sure no connections are in use before calling. Note that you are not required to call this when done with a DatabasePool, since connections are guaranteed to be closed when garbage collected. But this method gives more control regarding when the connections are closed.

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closeConnections

private void closeConnections(java.util.Vector connections)

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toString

public java.lang.String toString()

Description copied from class: java.lang.Object

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> roller >> business >> [ castor overview ]	PREV CLASS  NEXT CLASS
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