Quick question, where to put global variables

Very quick question:
where is the best place to put global variables,
(e.g. a flag that turns on debug mode)
if they are needed by the entire application?
I'm guessing they should be placed in their own class.
But should I make them public static final constants,
and just do Globals.MYCONSTANT
OR should i do "implements Globals" in all my other classes?
The first way seems simpler and more logical,
but in the examples for JSDT, they use the second technique.
Any thoughts?
thanks! =)

I would suggest either creating a properties file for your globals, or adding them to the system properties at startup. Placing items like debugging tags in your code means that you have to change the code, recompile, and rejar before your change is implemented. Using system properties means that you simply have to change your command-line options (i.e., from -Dmyapp.debug=true to -Dmyapp.debug=false).
Shaun

Similar Messages

Where to store "global variable" for a web application

There are some "global" variables in my portal web application. e.g. email server
name, admin email address etc. Will web.xml context-param a good place to store these
kind of information?
If so, how do I retrieve it back from a java class? It is easy in a jsp file: appalication.getAttribute(),
but how about a pipeline component or input processor which are all java file.
Please help!
Thank you very much
Ellen

I still believe that the information like connectivity parameters to remote
servers in the distributed environments would be best stored in the JNDI
tree. I agree, that it is not a "general storage area", but I am not talking
about storing application run-time data either.
In the clustered environments it would provide additional benefits of
centralizing this kind information across the cluster.
Regards,
Mike
"Subrahmanyam Allamaraju" <[email protected]> wrote in message
news:[email protected]..
>
JNDI is not a general-purpose storage area, although you could bind data
in a JNDI tree. A better (and simpler) way is to store them as context
parameters. You could read the initial values for these variables from a
servlet init parameters.
Subbu
Michael Goldverg wrote:
Ellen,
I would advise to put you global variable in JNDI tree.
You can use jndi.properties file to store name-value pairs, which will
get
loaded into jndi tree at the server startup. Just put this file in your
application class path.
The other method would be to code a startup class to store the global
variable in the jndi tree.
Regards,
Mike
"ellen" <[email protected]> wrote in message
news:[email protected]..
There are some "global" variables in my portal web application. e.g.
email
>>
server
name, admin email address etc. Will web.xml context-param a good place
to
>>
store these
kind of information?
If so, how do I retrieve it back from a java class? It is easy in a jspfile: appalication.getAttribute(),
but how about a pipeline component or input processor which are all javafile.
Please help!
Thank you very much
Ellen

Where to put xsl:variable definition

I apologize in advance if this is a really obvious question/answer for most of you.
I want to use this definition code to create a variable called color:
*<xsl:variable name="color" select="'red'"/>*
I want to include this code in my RTF template to display the contents of that variable:
*<?$color?>*
My question is this: where do I put the definition code? I've tried it in several different places, none of which have worked: at the top of my RTF template, on the top row of the table where I'm referring to it, and so forth.
When I run the preview, I get the typical error screen with this key line: Variable not defined: 'color'.

The subtemplate idea works quite well (mostly).
In my subtemplate, I defined this:
<?template:Format1?>
<?if:number(Sales) gt 1000000?><?attribute@incontext:color;'red'?> <?attribute@incontext:font-weight; 'bold'?><?end if?>
<?end Format1?>
In my template field, I call Format1 like this:
<?call@inlines:Format1?><?end call?>
Sure enough, my values are shown in bold red. Yay!!!
But now I've got extra vertical space in the affected cells. I've used table functions to align the values at the bottom of the cell. If I don't apply this conditional formatting, the row is what I'll call a "normal" height. When I apply the conditional formatting, the bold red numbers are displayed at the bottom of the cell as expected, but the row is twice as tall as its "normal" height.
The difference is found in the page source for the browser page. The <tr> tag shows a height of 13.216pt for the "normal" rows, but 25.933pt for the rows affected by the formatting. For some reason, BIP wants to generate a much taller row when it contains these formatted results.
I've experimented with attribute tags such as <?attribute@incontext:linefeed-treatment;'ignore'?> and <?attribute@incontext:height;14?>. I've used Word table formatting to fix the height of the row at exactly .3 inches. I removed the bold tag, and just kept the font color. None of those ideas was successful in removing the extra height.
Thoughts?

MYSQL questions, where to put them?

Hi all,
I've searched the board a few times, but can't find the place to put mySQL questions
Who can help me?
Thanks Hein

Hi,
http://forums.mysql.com/
Looks like a good place.
Regards,
Mark

Simple Question -- How to use global variables in an another function??!

Function named globalLeftMargin that has:
Global NumberVar LeftMargin := 5;
HOW DO I USE THIS IN ANOTHER FUNCTION? B/C IT DOES NOT RECOGNIZE IT AND GIVES THIS ERROR:
The ) is missing.
The other function is:
Space(LeftMargin)

Hi Ajay,
Add WhilePrintingRecords at the beginning of each formula like:
WhilePrintingRecords;
Global NumberVar LeftMargin := 5;
WhilePrintingRecords;
Global NumberVar LeftMargin;
Space(LeftMargin)
Good luck,
Brian

Declare global variable and retrive?

Hi,
we are working in live project in webtool, we wants to create global variable,
calling that variable in a required pages, our questions is that where to declare global variable and how to declare in which page we have to declare? pls guide us its very urgent and send the code.
Regards
Kannan.D
Edited by: kannan desikan on Jan 14, 2008 8:07 AM

Hi Kannan,
I would suggest using a comma delimied list or putting it in the database.
ArrayList myList = new ArrayList();
myList.Add("one");
myList.Add("two");
myList.Add("three");
string comma = "";
// store the array in the session state
foreach (string s in myList){
Session["persistedArray"] += comma + s;
comma = ",";
To get the array back
if (Session["persistedArray"] != null){
ArrayList myList = Session["persistedArray"].ToString().Split(new char[1] {','});
If your array is storing objects, you should use the database.

Where to put .txt file with SimpleInput

Hello everyone,
I'm rather new to Java and have a slight problem. The thing is that I need to write an app that can read a text file in this format:
2
Orc
name = Gnorck
experience = 20
maxHealthPoints = 50
healthPoints = 30
maxBerserk = 9
berserk = 7
Human
name = Aragorn
experience = 45
maxHealthPoints = 40
healthPoints = 30
maxGreed = 20
greed = 10
The first number is de number of characters in the file and after that every character is described in 7 lines.
Now the application has to be able to read the file. I've choosen to first just make a list of characters. A friend helped me with this code but I'm not completely sure if I know how it works. The code:
package RPGApplicatie;
import java.util.*;
public class Karakters {
     //Constructor
     public Karakters(int size){
          karakters = new ArrayList(size);
     //Methode voor het toevoegen van een karakter
     public void voegToe(Karakter k){
          karakters.add(k);
     public static Karakters readFile(String filename) throws ClassNotFoundException, RuntimeException, InstantiationException, IllegalAccessException{
          SimpleInput file = new SimpleInput(filename);
          int size = file.nextInt();
          Karakters result = new Karakters(size);
          for(int i = 0; i < size ; i++) {
               Class c = Class.forName(file.nextLine());
               result.voegToe((Karakter)c.newInstance());
          return result;
     //Variabelen aanmaken
     private ArrayList<Karakter> karakters;
}First question: I have the classes Karakter (which is the superclass for class Human and Orc), Human and Orc. So does the method forName scan for strings that are also classes? Like so it scans the file and when it comes across a line that says either 'Orc' or 'Human' it adds it to the list?
Second question: Where to put the text file that holds the data? I now have it in the same folder called test.txt. I use this code to run it:
package RPGApplicatie;
public class RPGApplicatie {
     public static void main(String[] args) throws ClassNotFoundException, RuntimeException, InstantiationException, IllegalAccessException {
          Karakters.readFile("test.txt");
}Thanks in advance! If more info is needed I can post that.
Regards,
Sander

I assume you have defined your Human and Orc classes to include fields name, experience, etc and a constructor that takes these values as parameters?
You can remove the Class.forName() method altogether. Example:
int count = file.readInt();
// define variables for Karakter values (name, experience etc.)
for (int i = 0; i < count; i++)
String characterClass = file.readLine();
// read common character components
if (characterClass.equals("Human")
    // read human specific components
    karakters.add(new Human(...));
if (characterClass.equals("Orc")
    // create Orc
//...Cheers

Global Variable in Oracle Forms 6i

Hi,
How & where to define global variable in Oracle form 6i and also let me know how to access it.
Thanks in advance
Regards,
Sanket

hi
Global variable are forms specifice variable.
it can store character value upto 255 for all usages.
We can initialize it when we declare otherwise give error if we did not assign it any value.
Oracle 10g it can take upto 4000 bytes
GLOBAL.ur_globalvar := TO_CHAR(15);
or
:GLOBAL.ur_globalvar:= '15';
or
Remmber numeric values are implicitly converted by oracle 2 character
:GLOBAL.ur_globalvar:= 15;
-- which can then subsequently be accessed using...
:GLOBAL.ur_globalvar;
-- To destroy a global variable and release its memory, use the ERASE built-in procedure:
Erase('GLOBAL.my_var'); Regards,
Abdetu...

OSB - global variable substitute?

I have a simple-looking requirement - I need to keep a single String value between OSB service calls. The value is retrieved from a message and is inserted into each upcoming message of the service, acting much like a simple cache. My question is, OSB lacking global variables, what are the options for keeping this String value in?
(cluster-wide deployment is no concern here, we can think of it as a single-node problem)

Re: Are there global variables in OSB??
Re: OSB: What is best practice for reading configuration information
OSB is lacking concept of global variable. But the use case can be accomplished with little or no effort using OSB constructs (Java callout, implementing this logic in separate service etc )
Manoj

Where to put datafiles

Hello everyone,
im writing a tool atm which needs some xsltemplates and for gui some jpg files.
my question: where to put datafiles?
atm i have the files in a seperate directory. my programm folder looks like this:
startscript.bat
startscript.sh
data <- directory
jar <- directory
is this an usual solution? is there the possibility to put the datafiles together with my class files into one jar? i think it would be much more clean to get all files (except of the startscript of course) to one jar file.
whats your opinion?
mfg
dominik

I normally put the images in an 'images' directory and the files in a 'dat' directory. It is then just a matter of getting the URL of the resource as
java.net.URL url = OneOfYourClasses.class.getClassLoader().getResource(path to your resourse);
For images, the 'path to your resource' for file fred.gif in the imaages directory would then be 'images/fred.gif' . Similarly for your data files.
An image can then be loaded using
ImageIcon imageIcon = new ImageIcon(url);
and a file opened with
url.openStream() .

Apex Global Variable like D2K

HI,
Previously my application was develop in d2k6i where i use global variable to keep user_id available in every forms...
is it posbile to declare global variable in Apex ?
Thanks
Engr.M.K Chowdhury

Just to extend Andy's point a little further, you may want to look at some of the built in Substitution Strings that APEX offers you right out of the tin:
http://download.oracle.com/docs/cd/E14373_01/appdev.32/e11838/concept.htm#BEIFGFJF
You may find that Oracle provide you with the global value you need but follow Andy's advice for creating your own.
Duncs

Global variable in servlet & DBPooling questions

Hello guys,
I used to develop PHP/ASP, and am new to servlet. I have been searching around for a solution ...
With Php, we can get the reference of a global variable in any classes->functions...
How do I do this with servlet ?
And second..I have developed the DB class as below... I set the datasource to be static, so it initializes only once. Is it a good idea? How would you like to improve this class? any comments?
package shop.database;
import javax.sql.DataSource;
import java.sql.*;
import org.apache.commons.dbcp.BasicDataSource;
import org.apache.log4j.Logger;
import shop.admin.exception.GeneralException;
public class DdManager {
     static protected Logger logger = Logger.getLogger(DdManager.class);
     private String userName = "root";
private String password = "";
private String hostName = "jdbc:mysql://localhost:3306/shop";
private String database="shop";
     static private DataSource ds;     // set this to be static so all threads share the same job in JVM
     private Statement stmt;
     private Connection conn;
     private ResultSet rs;
     private CallableStatement cs;
public DdManager() {}
* setup the data source and return it
     public static DataSource getDataSource(
          String sDrvName,
          String sUserName,
          String sPwd,
          String connectURI) {
          BasicDataSource ds = new BasicDataSource();
          ds.setDriverClassName( sDrvName );
          ds.setUsername( sUserName );
          ds.setPassword( sPwd );
          ds.setUrl( connectURI );
          ds.setMaxActive( 15 );
          ds.setMaxIdle( 10 );
          ds.setMaxWait( 10000 ); // 10 seconds
          return ds;
     * static init of the class
     * this class is will be called only once to initialize the DataSource
     static {
          try {
               Class.forName( "com.mysql.jdbc.Driver" );
               ds = getDataSource(     "com.mysql.jdbc.Driver",
                                        "root",
                                        "jdbc:mysql://localhost:3306/shop" );
               if (ds == null) {
                    String msg = "Connection Pool error";
                    logger.error(msg);
                    throw new GeneralException(msg);
               logger.info("DataSource has been initialized");
          } catch(Exception exception) {
               logger.error(exception.toString());
               try {
                    throw new GeneralException(exception.toString());
               } catch (GeneralException e) {
                    logger.error(e.toString());
     * get the connection from the pool (DataSource)
public void openConnection() throws GeneralException {
try {
     BasicDataSource bds = (BasicDataSource) ds;
     logger.info("NumActive: " + bds.getNumActive() + ", " + "NumIdle: " + bds.getNumIdle());
conn = ds.getConnection();
logger.info("Connection of " + database + " has been established");
} catch(Exception exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* close the connection will actually return the connection to the pool (Must)
public void closeConnection() throws GeneralException {
     initResource();
try {
     if (conn != null){
               conn.close();
               logger.info("Connection of " + database + " has been closed");
} catch(SQLException exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* prepare the calling stmt
public void prepareProcedure(String callStatement) throws GeneralException {
     initResource();
try {
     cs = conn.prepareCall(callStatement);
} catch(SQLException exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* set the pass-in parameter for "String"
public void setParameter(int position, String parameter) throws GeneralException {
try {
     cs.setString(position, parameter);
} catch(Exception exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* set the pass-in parameter for "Integer"
public void setParameter(int position, int parameter) throws GeneralException {
try {
     cs.setInt(position, parameter);
} catch(Exception exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
* execute the procedure and return the resultset
public ResultSet execProcedure() throws GeneralException {
try {
     rs = cs.executeQuery();
} catch(SQLException exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
return rs;
* close the statment and resultset
     private void initResource() throws GeneralException {
     try {
          if(rs != null) {
               rs.close();
          if(stmt!= null) {
               stmt.close();
          logger.info("Statement & Resultset have been free");
     } catch(Exception exception) {
     logger.error(exception.toString());
     throw new GeneralException(exception.toString());
Thanks mates!
myy

Thanks Saish,
Your response is really appreciated. Sorry about that
as i didnt know there is 'code' formatting button,
and I will look into the Singleton pattern.
As I'm still in the learning stage. Therefore, i
still have a lot of thing do not understand.
... use it in a method signature ...What is "a method signature" ?
A method signature is basically the method's parameters, return value, name and any access or other modifiers. The following is a method signature:
static final public void main(final String[] args)Between the braces of the method body is the implementation (or as I already alluded to, the method body).
Consider using an already-developed connection poolimplementation, such as Jakarta Commons DBCP ...
I'm trying to implement the Jakarta DBCP. Did I go
into the wrong way?
Sorry, did not read the imports. Yes, you are. However, I am confused about what you are trying to implement. You have a static method getDataSource(). You also have a static variable 'ds'. Use one or the other. I would be that there are seemingly random errors cropping up based on whether you remember to call getDataSource() or not.
You do not, generally, want the data source to be static. Multiple threads might use the class. And if there is only a static data source, you will either need to synchronize the methods that use the data source (resulting in a scaling bottleneck) or not synchronize them (which will totally destroy any concept of a logical unit of work or database transaction).
.. A static datasource, as in your class, can onlysafely be used by one thread at a time, potentially
introducing scaling bottlenecks (or race conditions)
in your system ...
So, you mean there is no need for the DataSource to
be static ?
No, in fact, IMO, it should not be. That is why you are pooling. Use instances. The pool will manage the connections and their availabilty for you.
Why are you throwing GeneralException everywhere?Here's a question: can someone using your class (a
caller) realistically be expected to handle a
database exception?
When there is a database error, I just want to stop
the process and redirect the user to an error page. I
will look into the unchecked exceptions. Thanks.
Unchecked exceptions do not need to be declared in a method signature or caught within the method body. Checked exceptions do. As such, an added benefit is that unchecked exceptions de-clutter your code.
In your initResources() method, what happens if theclose() on ResultSet throws an exception
Oh, yes. I'm so stupid.
Now I only have ...
     private static DataSource ds;     // set this to
be static so all threads share the same obj in JVM
     private Connection conn;
     private CallableStatement cs;
private void initResource() throws GeneralException
n {
     try {
          if(cs != null) {
               cs.close();
logger.info("CallableStatement has been
as been free");
     } catch(Exception exception) {
     logger.error(exception.toString());
throw new
throw new GeneralException(exception.toString());
You still have issues.
public void initResources() {
   if (rs != null) {
     try { rs.close(); } catch (SQLException ignore) { ignore.printStackTrace(); }
   if (stmt != null) {
     try { stmt.close(); } catch (SQLException ignore) { ignore.printStackTrace(); }
}Normally, this type of method would not be called initResources() but rather closeResources() or freeResources(). It would be called from within the 'finally' block of another method using the CallableStatement or ResultSet.
This is really is problem, would you mind to tell me
how to handle this(close the connection) if the
close() on either CallableStatement or Resultset
throws an exception ?
See above. Simply log the exception (there is usually nothing meaningful you can do if a close() fails, and it is up to you as a developer if this is an error or just a warning). Another option is to 'chain' exceptions. In your own exception, add a method 'addException(Throwable)'. This would add another exception to a List of exceptions. When you print the stack trace, iterate through the chained exceptions to print them all out. One place where I find this useful is rollback() code. If the original SQL statement fails AND the rollback fails, I definitely want to see that rollback() exception as well in my logs.
The DB thing makes me headache. What I actually
wanted is a solution for:
Let say I have a class "HelloAction.class" contains
the code:
public ActionForward XXX() {
     DbManager DB = new DBManager();
     ... do some DB thing here...
     SecondClass SC = new SecondClass();
     SC.doSomeOtherDbThing();
     ... do something else...
     ThirdClass TC = new ThirdClass();
     SC.doMoreOtherDbThing();
}There are some functions in SecondClass.class and
ThirdClass.class that will need database connection.
I consider 'global variable' is because I want these
two classes are able to use the same
connection(DbManager) from the function -
ActionForward XXX().
What is the best way to implement the above situation
(sharing the same connection in different classes &
sub-classes?
I also just realize that the problem of multi-threads
with these two class variables..
     private Connection conn;
     private CallableStatement cs;Really headache. I really appreciate any comments.
Thanks.
- myyPass the Connection or DataSource to each method or constructor. Call commit() or rollback() from the method that created the transaction.
- Saish

HT5312 I DO remember them but Apple chose to put them in Japanese and I can not change the language on Manage my Apple ID so I do not know if I made an error ,it threw me off , it was the wrong question Where did you fly to on your first Aiplane trip ? th

I DO remember them but Apple chose to put them in Japanese and I can not change the language on Manage my Apple ID so I do not know if I made an error ,it threw me off , it was the wrong question Where did you fly to on your first Aiplane trip ? then I was unable to enter until 8 hours then called Apple Japan 4 times each time threy asked me would you like to speak with an English speaker,I said yes then they told me sorry today is Sunday no English speakers ,but they refused to speak Japanese, then I called 5th time and a kind guy could speak English we were on 1and 1/2 hours he got me to log in but the reset key chain could not be completed still pending.
He said do not mess with that ! then I got a text from somewhere to reset 4 pins suddenly it was very strange I said to him that I got this pin this morning but it said you can use maximum 3 hours it had a UK number and I told him I do not like this and will not enter the code he said do not do it if it is from the UK and then I said to him ok you did a lot to help but we can not go any further ! and we cut of I went back to my computer to re do the ID but I found everything a mess so I call and a stupid sounding Japanese women with a squeaky voice came on I was calm at first and they want your phone number your IMEI number your iPhone serial number date of birth Address email address it takes 10 munutes to check then they ask what are you caling about so I try to explain my keychain is broken or problems with language security questions and can not change my pasword because the security question have failed me so it is ONE BIG HEADACHE AND I START I GET STRESSED she says Do want an ENGLISH speaker ,I say yes ,that guy i talked to earlier but I never got his name and first time I ever talked to him but they said he is not here so I said ok and then she said today is sunday so call back in the morning ,I said ,well ok in Japanese but they make you feel stupid because they do not want to speak Jap@anese with none natives and they are to busy,And they feel that I should not bother them ,then I say that Apple Japan is trying to refuse Apple foreign customers and then she wants to hang up and ask me to visit the shop ,but they are the same I have a very bad time with Apple Japan since they do not discuss software problems or security with customer meaning if you have a problem they ask you to come on a time 20 minutes max so they do hardware test and say you phone is fine then I say no I can not reset my ID they say you must call call centre so I am going around in circles ,When I call English it is usually Australia so if my problem is in Japan surely if do not want me to talk to them in Japanese and they ask me to call Australia but every time my call charge is expensive after asking them is this free because I have Apple care they say yes but when the call goes to Australia 0120 277 535 it might change to paid call so I call then I have to ask is this charging they say we can not give you that information ! so what can I do I have have been at the computer and phone all day on my day off work and in tre week I am so busy and can not use my phone I can not work without it ,this new technology for you ,they can not cope with the fact that the customer have problems yet they do not want to deal with us because they can not solve it and so it shows them to be useless they like to walk around in their cool tee shirts and retro shop but when it comes to functionality we are unwelcome they got the money so do not return because apple is perfect that nothing should go wrong .
But it does somehow my English security answers do not work on a Japanese Question especialy if I did not choose that question I set up the multiple choice In English and wrote the answers in English or Roman and set them langauge preferences in English, do you really think you can correctly write english name or word in Japanese they write a police patrol car pato caa パトカア　they do not have r and l .So it is my choice to make my security easy for me and as difficult for others to hack.But they also have patororoo choo meaning ' now patrolling ' so why they have pato caa patrol car and patoro patrol and have thousands of Chinese words kanji they can find patrol.
I am getting off the topic but I am at a loss to fix this problem when they hold the keys and i have all the info to verify my ID.

You have to enter the Apple ID and password. You are running into the Activation Lock
iCloud: Find My iPhone Activation Lock in iOS 7
Is there a way to find my Apple ID Name if I can't remember it?
Yes. Visit My Apple ID and click Find your Apple ID. See Finding your Apple ID if you'd like more information.
How do I change or recover a forgotten Apple ID Password?
If you've forgotten your Apple ID Password or want to change it, go to My Apple ID and follow the instructions. SeeChanging your Apple ID password if you'd like more information.

Null global variable in block's WHERE clause - no records?

I'm setting a :GLOBAL.emp_id in certain spots in my form. The EMPLOYEE block's WHERE clause says emp_id = :GLOBAL.emp_id. In the POST-QUERY, it sets that variable back to NULL so the next time they want to run a blind query, it will show all records.
Well when the :GLOBAL.emp_id is NULL, nothing comes up in a blind query. I even changed the WHERE clause to say emp_id = NVL(:GLOBAL.emp_id,'') but that didn't do anything either.
How can I get the WHERE clause to (basically) do nothing when that global variable is null? Or should I be messing with DEFAULT_WHERE instead of these global variables
I'm in 6i

I'm sorry - I stumbled on something soon after I posted and changed it to:
emp_id = NVL(:GLOBAL.emp_id,emp_id)
and it worked - duh

Hi, I have quick question about use of USEBEAN tag in SP2. When I specify a scope of SESSION for the java bean, it does not keep the values that I set for variable in the bean persistent.Thanks,Sonny

Make sure that your bean is implementing the serializable interface and that
you are accessing the bean from the session with the same name.
Bryan
"Sandeep Suri" <[email protected]> wrote in message
news:[email protected]..
Hi, I have quick question about use of USEBEAN tag in SP2. When I
specify a scope of SESSION for the java bean, it does not keep the
values that I set for variable in the bean persistent.Thanks,Sonny
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Quick question, where to put global variables

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