?? keygenerator.java
字號:
package com.javapatterns.keygen.ver2;
public class KeyGenerator
{
/**
* @label creates
*/
private static KeyGenerator keygen =
new KeyGenerator();
private int key ;
private static final int POOL_SIZE = 20;
private KeyGenerator() {}
public static KeyGenerator getInstance()
{
return keygen;
}
public synchronized int getNextKey()
{
return getNextKeyFromDB();
}
private int getNextKeyFromDB()
{
String sql1 = "UPDATE KeyTable SET keyValue = keyValue + 1 ";
String sql2 = "SELECT keyValue FROM KeyTable";
//execute the update SQL
//run the SELECT query
//mockup
return 1000;
}
}
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