| Methods Summary |
|---|
| public void | close()Finalize access to the underlying persistence layer.
save();
|
| public org.apache.struts.webapp.example.User | createUser(java.lang.String username)Create and return a new {@link User} defined in this user database.
synchronized (users) {
if (users.get(username) != null) {
throw new IllegalArgumentException("Duplicate user '" +
username + "'");
}
if (log.isTraceEnabled()) {
log.trace("Creating user '" + username + "'");
}
MemoryUser user = new MemoryUser(this, username);
synchronized (users) {
users.put(username, user);
}
return (user);
}
|
| public org.apache.struts.webapp.example.User | findUser(java.lang.String username)Return the existing {@link User} with the specified username,
if any; otherwise return null.
synchronized (users) {
return ((User) users.get(username));
}
|
| public org.apache.struts.webapp.example.User[] | findUsers()Return the set of {@link User}s defined in this user database.
synchronized (users) {
User results[] = new User[users.size()];
return ((User[]) users.values().toArray(results));
}
|
| public java.lang.String | getPathname()
return (this.pathname);
|
| public void | open()Initiate access to the underlying persistence layer.
FileInputStream fis = null;
BufferedInputStream bis = null;
try {
// Acquire an input stream to our database file
if (log.isDebugEnabled()) {
log.debug("Loading database from '" + pathname + "'");
}
fis = new FileInputStream(pathname);
bis = new BufferedInputStream(fis);
// Construct a digester to use for parsing
Digester digester = new Digester();
digester.push(this);
digester.setValidating(false);
digester.addFactoryCreate
("database/user",
new MemoryUserCreationFactory(this));
digester.addFactoryCreate
("database/user/subscription",
new MemorySubscriptionCreationFactory(this));
// Parse the input stream to initialize our database
digester.parse(bis);
bis.close();
bis = null;
fis = null;
} catch (Exception e) {
log.error("Loading database from '" + pathname + "':", e);
throw e;
} finally {
if (bis != null) {
try {
bis.close();
} catch (Throwable t) {
;
}
bis = null;
fis = null;
}
}
|
| public void | removeUser(org.apache.struts.webapp.example.User user)Remove the specified {@link User} from this database.
if (!(this == user.getDatabase())) {
throw new IllegalArgumentException
("User not associated with this database");
}
if (log.isTraceEnabled()) {
log.trace("Removing user '" + user.getUsername() + "'");
}
synchronized (users) {
users.remove(user.getUsername());
}
|
| public void | save()Save any pending changes to the underlying persistence layer.
if (log.isDebugEnabled()) {
log.debug("Saving database to '" + pathname + "'");
}
File fileNew = new File(pathnameNew);
PrintWriter writer = null;
try {
// Configure our PrintWriter
FileOutputStream fos = new FileOutputStream(fileNew);
OutputStreamWriter osw = new OutputStreamWriter(fos);
writer = new PrintWriter(osw);
// Print the file prolog
writer.println("<?xml version='1.0'?>");
writer.println("<database>");
// Print entries for each defined user and associated subscriptions
User users[] = findUsers();
for (int i = 0; i < users.length; i++) {
writer.print(" ");
writer.println(users[i]);
Subscription subscriptions[] =
users[i].getSubscriptions();
for (int j = 0; j < subscriptions.length; j++) {
writer.print(" ");
writer.println(subscriptions[j]);
writer.print(" ");
writer.println("</subscription>");
}
writer.print(" ");
writer.println("</user>");
}
// Print the file epilog
writer.println("</database>");
// Check for errors that occurred while printing
if (writer.checkError()) {
writer.close();
fileNew.delete();
throw new IOException
("Saving database to '" + pathname + "'");
}
writer.close();
writer = null;
} catch (IOException e) {
if (writer != null) {
writer.close();
}
fileNew.delete();
throw e;
}
// Perform the required renames to permanently save this file
File fileOrig = new File(pathname);
File fileOld = new File(pathnameOld);
if (fileOrig.exists()) {
fileOld.delete();
if (!fileOrig.renameTo(fileOld)) {
throw new IOException
("Renaming '" + pathname + "' to '" + pathnameOld + "'");
}
}
if (!fileNew.renameTo(fileOrig)) {
if (fileOld.exists()) {
fileOld.renameTo(fileOrig);
}
throw new IOException
("Renaming '" + pathnameNew + "' to '" + pathname + "'");
}
fileOld.delete();
|
| public void | setPathname(java.lang.String pathname)
this.pathname = pathname;
pathnameOld = pathname + ".old";
pathnameNew = pathname + ".new";
|
