Programming Languages Suite/ProgLangD.iso/VCAFE.3.0A/Sample.bin/Transaction.java

Java Source | 1998-10-17 | 6.7 KB | 246 lines

package symantec.sourcebook.servlet;

import java.io.*;
import java.util.*;
import javax.servlet.*;


class Transaction extends Object implements Serializable
{

    // static transaction table shared with other
    // threads

    static Hashtable transactions;


    String orderID;         // ID of the order
    long   recordCreated;   // time this record was created
    boolean verified;       // order ID has been verified with Web Order
    boolean accepted;       // if verified is true, accepted = true if order OK, false if order Declined
    long   downloadCount;   // number of times this order has attempted download


    // pricing information

    int price;
    int tax;
    int total;
    boolean chargeTax;

    // license information:

    String name;
    String company;
    String email;
    String address;
    String city;
    String state;
    String zip;
    String country;
    String phone;

    // authorization information

    String AuthCode;
    String ccOID;

    public Transaction(String name,
                       String email,
                       String address,
                       String city,
                       String company,
                       String state,
                       String country,
                       String zip,
                       String phone)
    {
        orderID = null;
        recordCreated = System.currentTimeMillis();
        verified = false;
        accepted = false;
        downloadCount = 0;

        // pricing information (in cents)

         price = 9900;
         tax = 817;
         total = 10717;
         chargeTax = false;

        // license information:

         this.name = name;
         this.email = email;
         this.address = address;
         this.city = city;
         this.state = state;
         this.country = country;
         this.zip = zip;
         this.phone = phone;
         this.company = company;

        // authroization information

        AuthCode = "";
        ccOID = "";
    }


  public static synchronized Transaction findTransaction(String orderId)
  {
    Transaction t = (Transaction) transactions.get(orderId);
    return t;

  }


  public synchronized void record() throws IOException
  {

    transactions.put(orderID,this);
    WriteTransactions();
  }






    /**
     *  Choose a unique, unguessable transaction id
     *
     *  This sample uses a simple unique ID that is non-secure.
     *
     *  ENHANCE: Add your own algorithm for owner IDs.  ID numbers
     *  need to be unique.  It should also be impossible for someone
     *  who has not received an order page to guess a valid order id.
     *
     */

    public synchronized void selectId() throws IOException
    {


        File fOrderId = new File("order.id");


        RandomAccessFile inOrderId = new RandomAccessFile(fOrderId,"rw");

        // Order IDs are assured uniqueness using a
        // counter on disk. Read and update the counter
        // creating it if needed.

        int id = 1;
        if(inOrderId.length() > 0)
        {
            id = inOrderId.readInt();
            inOrderId.seek(0);
        }

        inOrderId.writeInt(id+1);
        inOrderId.close();

        // Now add some data to the order ID to make it more
        // difficult to guess..

        long now = System.currentTimeMillis();

        long orderid = ((((now & 0x0000000000000FFF) ^ 0x0000000000000b2E) )  ) |
                        ( ((long)id) << 12) ;

        // ENCHNCE: to make the order ID unguessable you can enctrpt it
        // with a fixed key at this stage.

        orderID =  Long.toString(orderid,46);



    }



    // Read the transaction hash table
    // If servlet was shut down with out proper termination,
    // attempt to do recovery if possible

    public synchronized static void InitializeTransactions() throws ServletException, IOException, OptionalDataException, ClassNotFoundException
    {
        File currentTransactions = new File("transactions.current");
        File newTransactions = new File("transactions.new");

        // If transactions.new exists, we've got a problem.
        // The servlet probably terminated abnormally while updating the
        // transaction file.

        if(newTransactions.exists())
        {
            System.out.println("Transaction files in an inconsistant state");
            throw new ServletException("Transaction files in an inconsistant state");
        }

        // if the current transaction file exists, read it in

        if(currentTransactions.exists() )
        {
            FileInputStream fIn = new FileInputStream(currentTransactions);
            ObjectInputStream in = new ObjectInputStream(fIn);
            transactions = (Hashtable) in.readObject();
            in.close();
            fIn.close();

        }
        else
        {   // if there is no transaction file, start a new one
            transactions = new Hashtable();
        }

    }

    public synchronized static void WriteTransactions() throws IOException
    {

        // Remove transactions more than 48 hours old

        Enumeration key = transactions.keys();
        while(key.hasMoreElements())
        {
            String keyName = (String) key.nextElement();

            Transaction t = (Transaction)transactions.get(keyName);
            if(t.recordCreated + (48 * 3600 * 1000) < System.currentTimeMillis())
            {
                transactions.remove(keyName);
            }

        }

        // write updated transactions to file

        File newTrans = new File("transactions.new");
        FileOutputStream fOut = new FileOutputStream(newTrans);
        ObjectOutputStream out = new ObjectOutputStream(fOut);
        out.writeObject(transactions);
        out.close();
        fOut.close();


        File currentTrans = new File("transactions.current");
        File oldTrans = new File("transactions.old");

        // rename files, and delete old ones
        // Note: failure during the execution of this section of code
        //       may leave files in an inconsistant state

        if(oldTrans.exists()) oldTrans.delete();
        if(currentTrans.exists()) currentTrans.renameTo(oldTrans);
        newTrans.renameTo(currentTrans);




   }



}