Throwing away data after BufferedReader().readline()

I'm reading very large files - over 1GB. I'm reading sequentially and then writing to another file to create smaller files. Since the input file is so big, I'd like to just remove from memory the already read lines. Is there a way to do this using BufferedReader()?
Here is my BufferedReader line:
      br = new BufferedReader(new FileReader(new File(rawBill)));Then I have the standard while loop:
               while ((line = br.readLine()) != null) {
                                   ... write to another file here once all required data is read.
                        }Thanks.

jverd: I didn't realized the line variable would be
eligible for GC. Seems like it's just getting
rewritten to with the next line from the input file.
It's always holding some data it is not nulled out.Variables are never eligible for GC. Objects are.
Every time through that loop, a String object is created, and the variable line is pointed at it. The next time through, a new object is created, and line is pointed at the new string. Since line is now no longer pointing at the previous String object, that object is now eligible for GC, unless you pointed some other reference varialbe to it, that survives across loop iterations.
As long as you don't do something to "save" that String object, at any given time, there's only one that's not eligible for GC. All the previous ones are eligible.
My issue is with the input file. I assume
BufferedReader just continuously reads/stores the
data from the file when all the readLine calls get to
the end of the designated buffer size? No. BufferedReader just does physical reads in relatively large chunks, the size of which is independent of how many bytes you're actually trying to read. For example, when you call readLine, it may physically read 512 bytes from the file, but the line you're reading may only be 80 bytes long. This helps minimize the overhead of physical reads from the network or file system.
I don't think
the previously read data is purged upon the next IO
read from the file. It would be great if there was
a method on BufferedReader which would purge all
previously held data. I don't know what you mean by "purging" data. I don't think that's an issue that applies here.

Similar Messages

Bug with InputStream.read after BufferedReader.readLine in a Thread ?

I just found something strange when reading bytes on a socket after reading lines.
I'll show you an example :
In this example, when a connexion is established, I launch a thread where a single line of String then 3 bytes are read from the socket. I use BufferedReader.readLine for the String line then just InputStream.read to read the 3 bytes.
The results are quite random. Sometimes it works, sometimes not (most times it doesn't)... it seems to always work under linux (but haven't tested it as many times than on windows). Most of the time the program is stuck on the "socket.getInputStream().read(bytes);" line with 0 bytes available. I tried to do the same thing outside of a thread, I thought it worked better beaucause I was able to run it without any problem but it doesn't work anymore when I test it again.
I can't say if I'm doing something wrong or if it's a java bug (I've got JDK 1.6.0_03-b05).
Can you please have a look a this little example and maybe test it and let me know if it works or not. I tried to code my own readLine function and it seems to work with it but I'd like to know if it's a bug or what. Thank you.
Server side :
import java.io.*;
import java.net.*;
public class testServer extends Thread {
     private Socket socket;
     public testServer(Socket testSocket)
          socket = testSocket;
     public void readData() throws Exception
          BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
          String str;
          str = br.readLine();
          System.out.println(str);
          System.out.println("Bytes available : " + socket.getInputStream().available());
                //Try to read the bytes
                byte[] bytes = new byte[3];
                //STOPS THERE UNDER WINDOWS, BUT WORKS WITH LINUX
          socket.getInputStream().read(bytes);
                //Simple "ack" to say to the client that he can close the connexion
          socket.getOutputStream().write(0);
          socket.getOutputStream().flush();
                //Print the bytes values
          for(byte value : bytes)
               System.out.println(value);
     public void run()
          try {
               readData();
          } catch (Exception e) {
               e.printStackTrace();
     public static void main(String[] args) {
          try {
               ServerSocket welcomeSocket = new ServerSocket(3333);
               while(true)
                    new testServer(welcomeSocket.accept()).start();
          } catch (Exception e) {
               e.printStackTrace();
}client side :
import java.io.*;
import java.net.*;
public class testClient {
     public static void main(String[] args) {
          try {
                        //Some test values
               byte[] testValues = new byte[]{1,2,3};
               Socket socket = new Socket(InetAddress.getLocalHost(), 3333);
                        //Send the line through the socket
               BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
               bw.write("HELLO WORLD\r\n");
               bw.flush();
                        //then the bytes
               socket.getOutputStream().write(testValues);
               socket.getOutputStream().flush();
                        //Just waits for the server's ack to close the connexion
               socket.getInputStream().read();
               socket.close();
          } catch (Exception e) {
               e.printStackTrace();
}

It's your bug.
When you create a BufferedReader and ask it to read a line, the first thing it does is to read a whole buffer full of data (hence the name of the class) from its underlying input stream. That's probably about 4000 characters or something like that. It stores that internally and then starts doling it out in response to calls to readLine() and so on.
Then when you go back to reading from the underlying input stream, those 4000 or so characters are already gone from it. You have no access to the data the BufferedReader is hanging on to this way. All you can do is to start reading at the point after that whole buffer, which is not what you want.

Throws IllegalArgumentException when use BufferedReader.readLine()

hi
when i use BufferedReader.readLine() to read a html file of Internet,it throws IllegalArgumentException like blow:
java.lang.IllegalArgumentException
at java.nio.Buffer.position(Buffer.java:218)
at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:575)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:442)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:182)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at java.io.BufferedReader.fill(BufferedReader.java:136)
at java.io.BufferedReader.readLine(BufferedReader.java:299)
at java.io.BufferedReader.readLine(BufferedReader.java:362)
but it occured sometimes or occured never in a long time!
Why?

It does it because of this bit of code in java.nio.Buffer.position
if ((newPosition < 0) || (newPosition > limit))
throw new IllegalArgumentException ();So for some reason a bit of the java code has tried to set the position to either less than zero or greater than the limit of the buffer. Not a good idea in either case.
Since this is not your code you can't really do much about it. Try catching the exception and handling it.

Can not pass data after while loop

Hello.
I have created a VI for my experiment and am having problem passing data outside a while loop to save on an excel file. The VI needs to first move a probe radially, take data at 1mm increment, then move axially, take data radially at 1mm increment, then move to the next axial position and repeat. It would then export these data to an excel file. The VI is a little complicated but it's the only way I know how to make it for our experiment. I have tested it and all the motion works correctly, however I can not get it to pass the data after the last while loop on the far right of the VI where I have put the arrows (Please see the attached VI ). Is it because I'm using too many sequence, case, and while loops? If so, what other ways can I use to make it export data to the excel file?
Any help would be appreciated.
Thank you,
Max
Attachments:
B.Dot.Probe.Exp.vi ‏66 KB

Ummmm .... gee, I'm not even sure where to begin with this one. Your VI is well .... ummmm... You have straight wires! That's always nice to see. As for everything else. Well... Your fundamental problem is lack of understanding of dataflow programming. What you've created is a text program. It would look fantastic in C. In LabVIEW it makes my heart break. For a direct answer to your question: Data will not show up outside a while loop until the while loop has completed. This means your most likely problem is that the conditions to stop that specific loop are not being met. As for what the problem is, I don't even want to start debugging this code. Of course, one way to pass data outside of loops is with local variables, and hey, you seem to be having so much fun with those, what's one more?
This may sound harsh, and perhaps be somewhat insulting, but the brutal truth is that what I would personally do is to throw it out and to start using a good architecture like a state machine. This kind of framework is easy to code, easy to modify, and easy to debug. All qualities that your code seems to lack.
Message Edited by smercurio_fc on 08-17-2009 10:00 PM

Is the nano worth throwing away my old ipod mini?

I just bought a ipod mini 1 month before the nano came out. So now i'm feeling kinda ticked off as you can imagine.
The month that i did have an up to date ipod, i was enjouying it alot. In fact i currently have 200 songs on it and listen to them all frequently. So now the big question for me is if i should sell my current ipod mini so that i can buy a ipod nano.
Is the ipod nano worth it?

Yes. Throw away the Mini. Not literally; give it to a 7 year old just starting to appreciate music. Or, better yet, donate it to kids playing street hockey as it will glide better than a roll of electrical tape.
The nano is that good. It's that much of a breakthrough. It re-sets the bar for all portable electronics.
It boils down to light weight vs. capacity. If you can't listen to 4000 songs in a week, what's the point of carrying around an iBrick on the train, bus, or plane? Use iTunes, that's what it's for. It's there to be your library of all 4000 songs that you own. Once a week (or month) just dock the nano with iTunes and tweak your song choices a little bit.
It's like carrying around a carton of cigarettes when you can only smoke a pack a day. Lots of extra weight and complexity that can be eliminated when you can have a more simple device that can do a better job.
Ditch the Mini, grab a nano, and don't look back.
BJ

Customizing Calendar to disable all dates After Sysdate (Current Date)

Hi All,
I have a Requirement In OAF to Disable All Dates in the Calendar After the Sysdate
Ex: In Air Ticket Booking We can't Enter Previous Dates in the Calendar Like that I need to make the
my calendar dates after Sysdate Non Entarable
Please let me know if you have any sample code or We can fire any action before selecting a date to disable a particular set of Dates
Thanks,
Krishna

Hi ,
As per my opinion ,u shud put a check in PFR method at select event fire of date field ,capture the selected date anc check it shud be <= sysdate else throw a message using
throw new OAException ("this date should not exceed current date", OAException.ERROR);
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Pratap

How to get next date or date after n th day of a given date ?

I want to get the date after n th day of a given date.
Here a date and an integer will be the input.
suppose 15/12/2007 and 3 are the inputs and the output will be 18/12/2007
Is there any method to solve this purpose ?
Plz its urgent !!

javagalaxy.com wrote:
I didn't feel this is a home work for them. I feel the OP is trying to learn.Well, that is a part of what homework is. Now, tell me how doing it for them helps them learn? They might run it once, to make sure it does what it is suppossed to do, then simply turn it in. In the process, they haven't learned a thing. Only a very small fraction of posters will study the posted code to figure it out, as evidenced by the fact, that if the code is not 100% cut-n-paste capable for their assignment, they will come back and complain that this or that does not work, or was not done.
>
This will be good learning for the OP, why don't you point out what is done badly.
Did you mean using
now.add(Calendar.DAY_OF_MONTH, daysToAdd);
instead of
now.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH)+daysToAdd);?
That is the main crux of it, yes, but homework or not, you should actually attempt to catch and handle the exceptions, rather than simply declaring "throws Exception". Handling exceptions in the homework assignments will cause that to become a habit and you will actually do it correctly without thinking about it. Just like constantly declaring "throws Exception" in your homework will also make that a habit, and guarnatee that you will someday also do that when it counts, thereby causing all sorts of problems (usually for coworkers).
if its something else then please do let us know.
I can also learn how to do it good :)

Minimising throw away rows?

Friends,
I am trying to tune a query that is taking too long to return it's results.
One of the things I have noticed when looking at the explain plan is that during some parts of the execution it retrieves up to 70,000 records however the first line of the plan reads
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)|
| 0 | SELECT STATEMENT | | 6138 | 18M | | 8965 (0)|
Which I understand is the total number of records used by this query.
I know with SQL tunning that there are no hard and fast answers, however any pointers on how best to minimise the number of throw away rows would be appreciated.
Thanks in advance.

Ian,
As you mentioned, it is rather difficult to say anything, that too by looking at just one line of execution plan. Are you expecting the query to return 6138 rows as result ? Minimizing number of rows flowing out of each step is one way to look for tuning. If you are seeing 70,000 rows being flown out of some step in execution plan, that might be area to concentrate on. Is it some SORT step which is throwing out 70,000 rows ? It may be possible for you to defer the SORT by restructuring the query (ofcourse, without affecting end result). Pushing WHERE predicates i.e. filtering data as much as possible before joining or processing it further is also a an option to reduce large number of rows seen in execution plan.

How much code do you throw away?

Every now and then I have some slow time when I have punted everything to the testing team and I start looking at the next thing to attack. In these process I kick around ideas and implement them to see if they are any better then the current way of doing things. Some times I get 80% the way down the path and hit an unforeseen limitation. Other times when finished it is not as good or better enough to justify implementing over the current way. The worst is when I believe it is better but am unable to convince folks it is worth the effort. Occasionally time runs out and the idea withers on the vine.
I would say about 80% of these skunk work projects end up tossed out. Probably, only about 30 - 50% of the code gets tossed the bit bucket since inevitably a bunch of new stuff is learned that is useful.
How much code do y'all throw away, or am I an odd ball this way?

TexMark wrote:
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... What can I do?
Perform a Reset...
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TYPE-pools: slis.
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TYPES: BEGIN OF tp_data,
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SELECTION-SCREEN BEGIN OF BLOCK b3 WITH FRAME TITLE text-003.
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PERFORM get_data USING it_data.
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FORM get_data USING t_data TYPE tp_tbl_data.
SELECT msegmblnr msegmatnr mardwerks mardlgort mardlgpbe msegcharg msegbwart mkpfbudat
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Top of page heading
PERFORM set_top_page_heading USING t_heading t_event.
Events
PERFORM set_events USING t_event.
GUI Status
w_status = ''.
User commands
w_comm   = 'USER_COMMAND'.
Order
Example
PERFORM set_order USING '<field>' 'IT_DATA' 'X' space space t_sort.
PERFORM set_order USING 'MBLNR' 'IT_DATA' 'X' space 'X' t_sort.
PERFORM set_order USING 'EBELN' 'IT_DATA' 'X' space 'X' t_sort.
PERFORM set_order USING 'EBELP' 'IT_DATA' 'X' space space t_sort.
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CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
    i_callback_program       = sy-repid
    it_fieldcat              = t_fieldcat
    is_layout                = x_layout
    it_sort                  = t_sort
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    i_callback_user_command = w_comm
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    it_events                = t_event
    i_grid_title             = w_title
TABLES
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IF sy-subrc <> 0.
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FORM set_top_page_heading USING t_heading TYPE slis_t_listheader
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DATA: x_heading TYPE slis_listheader,
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Report title
CLEAR t_heading[].
CLEAR x_heading.
x_heading-typ = 'H'.
x_heading-info = 'Reporte Prueba'(001).
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Program name
CLEAR x_heading.
x_heading-typ = 'S'.
x_heading-KEY = 'Program: '.
x_heading-info = sy-repid.
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User who is running the report
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x_heading-typ = 'S'.
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x_heading-info = sy-uname.
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x_heading-typ = 'S'.
x_heading-KEY = 'Date: '.
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APPEND x_heading TO t_heading.
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CLEAR x_heading.
x_heading-typ = 'S'.
x_heading-KEY = 'Time: '.
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      The TOP_OF_PAGE event is alredy being registered in
      the set_top_page_heading subroutine.
FORM set_events USING t_events TYPE slis_t_event.
DATA: x_event   TYPE LINE OF slis_t_event.
Example
clear x_event.
x_event-name = .
x_event-form = .
append x_event to t_event.
ENDFORM.
*&      Form set_order
      Adds an entry to the order table.
FORM set_order USING p_fieldname p_tabname p_up p_down p_subtot
      t_sort TYPE slis_t_sortinfo_alv.
DATA: x_sort TYPE slis_sortinfo_alv.
CLEAR x_sort.
x_sort-fieldname = p_fieldname.
x_sort-tabname   = p_tabname.
x_sort-UP = p_up.
x_sort-down = p_down.
x_sort-subtot = p_subtot.
APPEND x_sort TO t_sort.
ENDFORM.                    "set_order
*&      Form set_fieldcat2
      Adds an entry to the field catalog.
FORM set_fieldcat2 USING p_colpos p_fieldname p_ref_fieldname p_ref_tabname
      p_outputlen p_noout
      p_seltext_m p_seltext_l p_seltext_s p_reptext_ddic p_ddictxt
      p_hotspot p_showasicon p_checkbox p_edit
      p_dosum
      t_fieldcat TYPE slis_t_fieldcat_alv.
DATA: wa_fieldcat TYPE slis_fieldcat_alv.
CLEAR wa_fieldcat.
General settings
wa_fieldcat-fieldname = p_fieldname.
wa_fieldcat-col_pos = p_colpos.
wa_fieldcat-no_out = p_noout.
wa_fieldcat-HOTSPOT = p_hotspot.
wa_fieldcat-CHECKBOX = p_checkbox.
wa_fieldcat-ICON = p_showasicon.
wa_fieldcat-do_sum = p_dosum.
Set reference fieldname, tablenam and rollname.
If p_ref_tabname is not given, the ref_fieldname given is a data element.
If p_ref_tabname is given, the ref_fieldname given is a field of a table. In case ref_fieldname is not given, it is copied from the fieldname.
IF p_ref_tabname IS INITIAL.
    wa_fieldcat-rollname =   p_ref_fieldname.
ELSE.
    wa_fieldcat-ref_tabname = p_ref_tabname.
    IF p_ref_fieldname EQ space.
      wa_fieldcat-ref_fieldname =   wa_fieldcat-fieldname.
    ELSE.
      wa_fieldcat-ref_fieldname =   p_ref_fieldname.
    ENDIF.
ENDIF.
Set output length.
IF NOT p_outputlen IS INITIAL.
    wa_fieldcat-outputlen = p_outputlen.
ENDIF.
Set text headers.
IF NOT p_seltext_m IS INITIAL.
    wa_fieldcat-seltext_m = p_seltext_m.
ENDIF.
IF NOT p_seltext_l IS INITIAL.
    wa_fieldcat-seltext_l = p_seltext_l.
ENDIF.
IF NOT p_seltext_s IS INITIAL.
    wa_fieldcat-seltext_s = p_seltext_s.
ENDIF.
IF NOT p_reptext_ddic IS INITIAL.
    wa_fieldcat-reptext_ddic = p_reptext_ddic.
ENDIF.
IF NOT p_ddictxt IS INITIAL.
    wa_fieldcat-ddictxt = p_ddictxt.
ENDIF.
Set as editable or not.
IF p_edit IS NOT INITIAL.
    wa_fieldcat-INPUT     = 'X'.
    wa_fieldcat-EDIT     = 'X'.
ENDIF.
APPEND wa_fieldcat TO t_fieldcat.
ENDFORM.                   "set_fieldcat2
=========================== Subroutines called by ALV ================
*&      Form top_of_page
      Called on top_of_page ALV event.
      Prints the heading.
FORM top_of_page.
CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
EXPORTING
    i_logo             = 'XXXXX'
    it_list_commentary = t_heading.
ENDFORM.                    " alv_top_of_page
*&      Form user_command
      Called on user_command ALV event.
      Executes custom commands.
FORM user_command USING r_ucomm     LIKE sy-ucomm
      rs_selfield TYPE slis_selfield.
ENDFORM.                    "user_command
this is my code, how to store data after clicking checkbox in databasetable,
how to write that cide.
plz send me code.

hi!,
use MODIFY to update data into the data base table.
regards
anjali

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