Using Accessor Method from Within Considered Best Practice?

I was wondering what is considered best practice in the AS3 world regarding this topic.
In C++ and .NET world, as well as PHP I would consider using accessor methods, instead of directly accessing the class property, bad practice due to unnecessary overhead.
What are your thoughts in this?

Getters and setters and bindable vars can be public, protected or private. Which one you choose follows standard object-oriented practices.
is just like a macro that defines a particular get/set pair. I would only use it on vars. Using it on a getter simply wraps the getter in another get/set pair which is wasteful. The Flex Framework rarely uses . Instead, we typically define get/set pairs with metadata so we can control what event fires and when. It also saves SWF size because the compiler doesn't have to generate a long and ugly name to avoid name collisions.
Alex Harui
Flex SDK Developer
Adobe Systems Inc.
Blog: http://blogs.adobe.com/aharui

Similar Messages

Access AM method from backing bean - best practice

Hello,
I need to call an appModule method from a backing bean. What is better?
1. Resolve bindings.AMDataControl.dataProvider, get AM and invoke the method directly
or
2. Create method action in page definition, resolve OperationBinding from it's binding expression and execute the operationBinding
I don't need to have a button on the page for this method.
Rado

Good question Rado.
With a "flexible" framework like Oracle ADF, I also ask myself sometimes what would be the preferred approach to do things.
See also these forum threads:
- about "ADF Faces: Passing values from a managed bean to ADF BC module"
http://forums.oracle.com/forums/thread.jspa?threadID=486742
- about : "ADF Faces: getting selected row data in multi select table ..."
http://forums.oracle.com/forums/thread.jspa?threadID=503248
regards
Jan Vervecken

How to call a set method from within a constructor

Hello,
I want to be able to call a set method from within a Scanner, to be used as the argument to pass to the Scanner (from a source file). Here's what i tried:
private void openFiles()
        input = new Scanner( setSource );
    and here is the set method:
public String setSource( String in )
        source = in;
        return source;
    }obviously there will be more code in this method but i'm trying to tackle one problem at a time. Thanks in advance..

The "String in" declaration says: "Nobody may ever invoke setSource() without specifying a certain String. The content of the String is known at run-time only."
In no place in your code you say the compiler: "I want the 'in' variable (actually, parameter) of method setSource() to contain the first arg which is passed to the application".
This is exactly the same mechanism allowing you to write "new Scanner" with something inside the two parentheses.

How to call methods from within run()

Seems like this must be a common question, but I cannot for the life of me, find the appropriate topic. So apologies ahead of time if this is a repeat.
I have code like the following:
public class MainClass implements Runnable {
public static void main(String args[]) {
Thread t = new Thread(new MainClass());
t.start();
public void run() {
if (condition)
doSomethingIntensive();
else
doSomethingElseIntensive();
System.out.println("I want this to print ONLY AFTER the method call finishes, but I'm printed before either 'Intensive' method call completes.");
private void doSomethingIntensive() {
System.out.println("I'm never printed because run() ends before execution gets here.");
return;
private void doSomethingElseIntensive() {
System.out.println("I'm never printed because run() ends before execution gets here.");
return;
}Question: how do you call methods from within run() and still have it be sequential execution? It seems that a method call within run() creates a new thread just for the method. BUT, this isn't true, because the Thread.currentThread().getName() names are the same instead run() and the "intensive" methods. So, it's not like I can pause one until the method completes because they're the same thread! (I've tried this.)
So, moral of the story, is there no breaking down a thread's execution into methods? Does all your thread code have to be within the run() method, even if it's 1000 lines? Seems like this wouldn't be the case, but can't get it to work otherwise.
Thanks all!!!

I (think I) understand the basics.. what I'm confused
about is whether the methods are synced on the class
type or a class instance?The short answer is; the instance for non-static methods, and the class for static methods, although it would be more accurate to say against the instance of the Class for static methods.
The locking associated with the "sychronized" keyword is all based around an entity called a "monitor". Whenever a thread wants to enter a synchronized method or block, if it doesn't already "own" the monitor, it will try to take it. If the monitor is owned by another thread, then the current thread will block until the other thread releases the monitor. Once the synchronized block is complete, the monitor is released by the thread that owns it.
So your question boils down to; where does this monitor come from? Every instance of every Object has a monitor associated with it, and any synchronized method or synchonized block is going to take the monitor associated with the instance. The following:
synchronized void myMethod() {...is equivalent to:
void myMethod() {
    synchronized(this) {
...Keep in mind, though, that every Class has an instance too. You can call "this.getClass()" to get that instance, or you can get the instance for a specific class, say String, with "String.class". Whenever you declare a static method as synchronized, or put a synchronized block inside a static method, the monitor taken will be the one associated with the instance of the class in which the method was declared. In other words this:
public class Foo {
    synchronized static void myMethod() {...is equivalent to:
public class Foo{
    static void myMethod() {
      synchronized(Foo.class) {...The problem here is that the instance of the Foo class is being locked. If we declare a subclass of Foo, and then declare a synchronized static method in the subclass, it will lock on the subclass and not on Foo. This is OK, but you have to be aware of it. If you try to declare a static resource of some sort inside Foo, it's best to make it private instead of protected, because subclasses can't really lock on the parent class (well, at least, not without doing something ugly like "synchronized(Foo.class)", which isn't terribly maintainable).
Doing something like "synchronized(this.getClass())" is a really bad idea. Each subclass is going to take a different monitor, so you can have as many threads in your synchronized block as you have subclasses, and I can't think of a time I'd want that.
There's also another, equivalent aproach you can take, if this makes more sense to you:
static final Object lock = new Object();
void myMethod() {
    synchronized(lock) {
      // Stuff in here is synchronized against the lock's monitor
}This will take the monitor of the instance referenced by "lock". Since lock is a static variable, only one thread at a time will be able to get into myMethod(), even if the threads are calling into different instances.

No access to method from within the same class

Hey there.
First I have to excuse my English for I'm german and just learning...
Ok, my problem is as follows. I have a class called JDBC_Wrapper it includes the method sendQuery(String query). When I call this method from within another class (where 'wrapper' is my instance of JDBC_Wrapper) it works fine. For example:
wrapper.sendQuery("SELECT * FROM myDataBase");
But then I have written a method called getNumRows() into my JDBC_Wrapper class.
This method should send a query through sendQuery(Strin query) but when calling getNumRows() it says: "java.sql.SQLException: [FileMaker][ODBC FileMaker Pro driver][FileMaker Pro]Unbekannter Fehler." (Unbekannter Fehler -> Unknown Exception). What could that be?
I'm using jdk2 sdk 1.4.2 with BlueJ. My database is Filemaker Pro 6. The ODBC/JDBC connector works fine.
BerndZack

This is within my JDBC_Wrapper class:
public ResultSet sendQuery(String query)
        if(connected)
            try
                Statement s = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
                ResultSet rs = s.executeQuery(query);
                return rs;
            catch(Exception e)
                System.out.println(e);
        else
            //System.out.println("There is no connection to the datasource!");
        return null;
public int getNumRows()
        try
            ResultSet r;
            r = this.sendQuery("SELECT COUNT(*) FROM " + table_name); // At this line the error occurs
            r.next();
            return (int)r.getInt(1);
        catch(Exception e)
            System.out.println(e.getMessage());
            return -1;
}When I call sendQuery() from within another class it works, but calling getNumRows()
throws an exception.

Use a method from another class in another package?

How can I use a method from another class in another package?

WhiteJ wrote:
What do you mean by "new keyword?" You posted this previously:
I tried that, it seems to not be working. I want to use the constructor from the other class. I imported it, using this piece of code:
import components.FileChooser;
components.FileChoser();
Typically if I am going to call a constructor on a class called Fubar, I'd use new to create a new object:
Fubar myFubar = new Fubar();Incidently, is it a simple typo in your post or are you trying to use a FileChoser object when it should be FileChooser?

When to use unattend.xml in task sequence - best practice?

Hi, I've tried researching this but not found an answer to my specific query.
We have ConfigMgr 2012 R2 with MDT 2013 although I don't think this is an MDT specific question.
I'm trying to create a Build and Capture task sequence for our Windows Server 2008 R2 and Server 2012 /2012R2 server builds utilising an UNATTEND.XML file to make some customisations that can be deployed for every build afterwards in a Deployment Task Sequence.
Specifically the addition of some Windows Features like SNMP and it's configuration and the addition of the Telnet Client. There are other bits like language settings and configuration items but I'm specifically interested in the Features part for my question.
In CM 2012R2 you now have the option under the "Apply Operating System" to use a captured image or an original installation source. However they work differently if you specify the use of the same unattended answer file.
The "image" deployment ignores all of the "add features" sections of the XML file and the "installation source" loses the configuration options from SNMP from the XML file. When you then deploy the captured image using
the same unattend.xml again the one from the "installer" now has all the SNMP features required and the one from the "image" is still missing everything.
So my question is as follows.
What is best practice for specifying an unattend.xml file in a task sequence. Is it in the build and capture TS or in the Deployment TS ?
or
Do I need multiple XML files, one for build and capture with some bits in and another for deployment with the rest in?
or
Should I be doing something else?
Although this is specifically asking about Server O/S we will be using the same methodology for Windows 7 deployment.

In this case DISM is only used to add the actual features... for configuration you could use a simple script that runs afterwards. Sample registry file:
SAMPLE REG FILE - HKLM-SNMP.reg
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SNMP\Parameters]
"NameResolutionRetries"=dword:00000010
"EnableAuthenticationTraps"=dword:00000001
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SNMP\Parameters\PermittedManagers]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SNMP\Parameters\RFC1156Agent]
"sysServices"=dword:0000004f
"sysLocation"=""
"sysContact"=""
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SNMP\Parameters\TrapConfiguration]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SNMP\Parameters\TrapConfiguration\public]
"1"="127.0.0.1"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SNMP\Parameters\ValidCommunities]
"public"=dword:00000004
Sample batch file:
SAMPLE SCRIPT FILE - ConfigureSNMPService.bat
@ECHO OFF
net stop "SNMP Service"
regedit /s HKLM-SNMP.reg
net start "SNMP Service"
Also some settings for SNMP can be controlled through group policy:
http://serverfault.com/questions/285762/group-policy-for-multiple-snmp-permitted-managers

What is Considered Best Practice for Error Handling in Components?

What would be the best approach to handling errors in custom (possibly composite) components?
I see three different possibilities:
Having the error handling funciton within the component. The problem is that this is not adaptable to the consumers error handling setup (i.e. logging to database, redirecting to a pretty error screen, etc.).
Passing in an error function as a parameter. The problem here is how to have the externally defined error function interact with external elements that are not defined within the component, i.e. passing the error or fault object to a logging class, or something similar, of which the component knows nothing about.
Referencing the external error handling methods directly from within the component. (Of course that's shabby programming, just listing as a technical option.)
How do you solve this?
My goal is to have a versatile custom component that can utilize any given consumer's error handler.
Thanks,
Mike

or define a customized event and dispatch it when error occur, then you can just listen to it outside

Re-use message mapping from within java mapping?

Hi there,
I have a question regarding java mapping. What I would like to do is to re-use an existing message mapping from within java mapping.
Technicaly, message mapping is perfomed by com.sap.aii.mappingtool.tf3.AMappingProgram.execute, right? I would like to call that mapping program for a specifc message mapping from within my java mapping.
Pseudo java code would look like this:
public void execute(InputStream in, OutputStream out)
throws StreamTransformationException {
com.sap.aii.mappingtool.tf3.AMappingProgram.execute(in,out,'SomeMessageMapping');
SomeMessageMapping is a message mapping that is defined in the integration repository.
Is it possible? If so, could you provide me with some details?
Thank you and best regards,
Wolfgang

Hi Wolfgang,
very interesting idea?
I would activa a dummy message mapping. than I would have a look in the file directory of the java-stack and try to find out the name of the *.class or *.jar file.
On the other hand you could generate a tpz-transport-file an unpack this file, to explore the name of the *.class or *.jar
Unfortunately I do not have access to the file system. So I can't explore the name.
Regards Mario

EJB 3.1 @Asynchronous and calling other methods from within

Hey all,
I am helping a friend set up a test framework, and I've turned him on to using JEE6 for the task. I am decently familiar with entity beans, session beans, and such. One of the new features is @Asynchronous, allowing a method to be ran on a separate thread. The test framework generally needs to spawn potentially 1000's of threads to simulate multiple users at once. Originally I was doing this using the Executor classes, but I've since learned that for some reason, spawning your own threads within a JEE container is "not allowed" or bad to do. I honestly don't quite know why this is.. from what I've read the main concern is that the container maintains threads and your own threads could mess up the container somehow. I can only guess that this might be possible if your threads use the container services in some way.. but if anyone could enlighten me on the details as to why this is bad, that would be great.
None the less, EJB 3.1 adds the async capability and I am now looking to use this. From my servlet I use @EJB to access the session bean, and call an async method. My servlet returns right away as it should. From the async method I do some work and using an entity bean store results, so I don't need to return a Future object. In fact, my ejb then makes an HttpClient call to another servlet to notify it that the result is ready.
My main question though, is if it's ok to call other methods from the async method that are not declared @Asynchronous. I presume it is ok, as the @Asynchronous just enables the container to spawn a thread to execute that method in. But I can't dig up any limitations on the code within an async method.. whether or not it has restrictions on the container services, is there anything wrong with using HttpClient to make a request from the method.. and making calls to helper methods within the bean that are not async.
Thanks.

851827 wrote:
Hey all,.. from what I've read the main concern is that the container maintains threads and your own threads could mess up the container somehow. I can only guess that this might be possible if your threads use the container services in some way.. but if anyone could enlighten me on the details as to why this is bad, that would be great.
Yes since the EE spec delegated thread management to conatiners, the container might assume that some info is available in the thread context that you may not have made available to your threads.
Also threading is a technical implementation detail and the drive with the EE spec is that you should concentrate on business requirements and let the container do the plumbing part.
If you were managing your own threads spawned from EJBs, you'd have to be managing your EJBs' lifecycle as well. This would just add to more plumbing code by the developer and typically requires writting platform specific routines which the containers already do anyway.
>
None the less, EJB 3.1 adds the async capability and I am now looking to use this. From my servlet I use @EJB to access the session bean, and call an async method. My servlet returns right away as it should. From the async method I do some work and using an entity bean store results, so I don't need to return a Future object. In fact, my ejb then makes an HttpClient call to another servlet to notify it that the result is ready.
My main question though, is if it's ok to call other methods from the async method that are not declared @Asynchronous. I presume it is ok, as the @Asynchronous just enables the container to spawn a thread to execute that method in. But I can't dig up any limitations on the code within an async method.. whether or not it has restrictions on the container services, is there anything wrong with using HttpClient to make a request from the method.. and making calls to helper methods within the bean that are not async.
Thanks.If you want to be asynchronous without caring about a return value then just use MDBs.
The async methods have no restrictions on container services and there is nothing wrong with calling other non async methods. Once the async method is reached those annotations don't matter anyway (unless if you call thhose methods from a new reference of the EJB that you look up) as they only make sense in a client context.
Why do you need to make the call to the servlet from the EJB? Makes it difficult to know who is the client here. Better use the Future objects and let the initial caller delegate to the other client components as needed.

Import data from excel file - best practice in the CQ?

Hi,
I have question related to importing data from excel file and creates from those data a table in the CQ page. Is inside CQ some OOTB component which provides this kind of functionalities? Maybe somebody implement this kind of functionality or there is best practice to do this kind of functionalities?
Thanks in advance for any answer,
Regards
kasq

You can check a working example package [1] (use your Adobe ID to log in)
After installing it, go to [2] for immediate example.
Unfortunately it only supports the old OLE-2 Excel format (.xls and not .xlsx)
[1] - http://dev.day.com/content/packageshare/packages/public/day/cq540/demo/xlstable.html
[2] - http://localhost:4502/cf#/content/geometrixx/en/company/news/pressreleases/my_personal_bes ts.html

(Swing) Reading fields from other forms - Best practice

Hi All,
I have been learning Java and Swing through NetBeans (quite a cool way to do it). I would like some 'best-practice' advice please. Google and search on this forum are normally my friends, can't find anything relevant for this though. I have created an application that seems to be functional, all my navigation is through tabs.
To make my app portable I have created a ?Settings? part. To save having another tab, I have basically copied the way NetBeans deals with opening the ?About Box? in its example, and have set-up fields in here. This essentially opens a JDialog with fields through an option in the menu.
I figure the best way to store the data is in a simple text file, and have the application read the values on start-up? Then when somebody changes the fields and saves it just overwrites the text file with the new values. I am not sure how to best read these in though, I can?t find a way of reading direct from the JDialog (i.e. var.getText()) which makes sense as the JDialog will be closed.
Will my best practice simply be writing a class which reads the file, then whenever I need a value just calling the class?
Thanks a lot

You should not be using preference files unless you really know what you are doing. This is one area of the very few areas of Java programming that can have lasting nasty negative affects on a computer that runs the code if done wrong.
If you want the user to save preferences it is better to just use xml. The advantage of preference files is they can be used by multiple programs and are permanent even after the program is done running/deleted/writen-over/forgotten. The disadvantages of preference files is they can be used by multiple programs, are permanent even after the program is done running/deleted/writen-over/forgotten, can cause damage to your OS, may be seen as harmfull by add blockers and/or anti-virus software, may lead to conflicts with other software that uses similar naming schemes, and are pretty much unportable.
You are going to be much better off in the long run learning XML and just saving them there, an added benefit of XML is if you screw something up and it causes your program to no longer run you can easily edit the xml by hand.
JSG

Import files into bridge from a CMS - best practice

Hi All,
i am trying to come up with the simplest solution for the following:
we have a CMS in which our content is managed and edited.
the content editor might like to edit video files that reside in our asset management system.
our editing tool is Adobe Premiere.
My thought was to transfer the video file along with its metadata and edit instructions to an FTP server from our asset repository and then transfer these files into the video editing local environment using bridge. after editing the file - it should be transferred back into the asset repository via FTP server or such.
it seems the way to this would be to extend the bridge functionality using the java script SDK, but i would love to know if there is a best practice solution before we start detailed design and development.
your help is highly appreciated and thanks in advance,
Deena

Not sure what advice you have been given and how you have interpreted it.
You are of course referring to im6 here since you can't drag projects from im08 to iDVD.
I don't make many DVD's anymore and may well be wrong here but I'm not aware that dragging an im6 project to iDVD is any different than using share/iDVD and I'm wondering if the advice relates to exporting from im6 and then importing the exported movie into iDVD which is indeed a different workflow.

OIM Database Connector - ID PK from DB Sequence Best Practice?

Figured I'd ask around before I hacked something together for something that is a very common scenario. When provisioning my PK (ID) is not set and is set via a Oracle Sequence. I'm currently using the Database Application Tables GTC connector. A couple approaches, based on my limited OIM knowledge:
1. OnInsert DB trigger to handle. Requires nothing from OIM for this, but I really feel like this is way too invasive and doesn't support the "passive" nature of Identity Management.
2. Deviate from the GTC and get the SEQUENCE from a custom adapter task.
3. Go have a beer.
If there is some documentation or posts regarding this please let me know. I checked the best practices & connector docs and found nothing about this.

I think you have a good grasp of the problem. Option 3 is of course superior to the others :)
If you start using pre-pops on GTC generated forms you can't regenerate the GTC or you risk losing the pre pop connectors.
There has been some discussions around what Oracle supports when it comes to GTC but it seems like you now can add prepop and entity adapters and still stay in support.
Best regards
/M

Calling parent method from within child object

Hello,
A quick question! Is it possible to call a method in a parent object from within a child object.By child object I mean an object that was instantiated within the parent object.
Thanks.

A quick question! Is it possible to call a method in a
parent object from within a child object.By child
object I mean an object that was instantiated within
the parent object.Since you are using ambiguous terminology, it would be much better if you provided a small sample of your code to avoid confusion. I am guessing that you are actually talking about an inner class when you say child class.
If that is correct, then you can do something like this:
class Parent {
void foo() {}
void bar() {}
class Child {
    void foo() {}
    void test() {
      bar(); // No conflicts, just call the Parent method
      Parent.this.foo(); // Use explicit qualification to avoid conflicts.

Using Accessor Method from Within Considered Best Practice?

Similar Messages

Maybe you are looking for