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1 package org.prevayler.demos.demo2.business;
2
3 import java.util.*;
4
5 public class Bank implements java.io.Serializable  {
6
7 private long nextAccountNumber = 1;
8 private Map accountsByNumber = new HashMap();
9 private transient BankListener bankListener;
10
11 public Account createAccount(String holder) throws Account.InvalidHolder {
12 Account account = new Account(nextAccountNumber, holder);
13 accountsByNumber.put(new Long (nextAccountNumber++), account);
14
15 if (bankListener != null) bankListener.accountCreated(account);
16 return account;
17 }
18
19 public void deleteAccount(long number) throws AccountNotFound {
20 Account account = findAccount(number);
21 accountsByNumber.remove(new Long (number));
22 if (bankListener != null) bankListener.accountDeleted(account);
23 }
24
25 public List accounts() {
26 List accounts = new ArrayList(accountsByNumber.values());
27
28 Collections.sort(accounts, new Comparator() {
29 public int compare(Object acc1, Object acc2) {
30 return ((Account)acc1).number() < ((Account)acc2).number() ? -1 : 1;
31 }
32 });
33
34 return accounts;
35 }
36
37 public void setBankListener(BankListener bankListener) {
38 this.bankListener = bankListener;
39 }
40
41 public Account findAccount(long number) throws AccountNotFound {
42 Account account = searchAccount(number);
43 if (account == null) throw new AccountNotFound(number);
44 return account;
45 }
46
47 public void transfer(long sourceNumber, long destinationNumber, long amount, Date timestamp) throws AccountNotFound, Account.InvalidAmount {
48 Account source = findAccount(sourceNumber);
49 Account destination = findAccount(destinationNumber);
50
51 source.withdraw(amount, timestamp);
52 if (amount == 666) throw new RuntimeException ("Runtime Exception simulated for rollback demonstration purposes.");
53 destination.deposit(amount, timestamp);
54 }
55
56 private Account searchAccount(long number) {
57 return (Account)accountsByNumber.get(new Long (number));
58 }
59
60 public class AccountNotFound extends Exception {
61 AccountNotFound(long number) {
62 super("Account not found: " + Account.numberString(number) + ".\nMight have been deleted.");
63 }
64 }
65
66 } |
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