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From "Alexey Petrenko" <alexey.a.petre...@gmail.com>
Subject Re: Suggestion (was: Re: [jira] Closed: (HARMONY-932) [classlib][nio]java.nio.?hannel.DatagramChannel.read(ByteBuffer[] , int, Integer.MAX_VALUE) throws NotYetConnectedException while RI throws IndexOutOfBoundsException)
Date Fri, 21 Jul 2006 09:29:15 GMT
2006/7/21, Alexey Petrenko <alexey.a.petrenko@gmail.com>:
> My two cents... :)
>
> Put all the array size checking code in one place is a good idea. Code
> reuse is always good idea.
>
> But do not forget that Java has 2 problems here:
> 1. It can not inline methods or include code in java file
> 2. Method call is a long operation.
>
> So huge number of additional method calls can significantly downgrade
> the performance...
>
> Probably VM JIT guys will correct me.
>
> Anyway... I think that the best plays for such tool methods is a misc
> module, not util.
"Place" not "plays" :)
Should have more time to sleep :)

>
> SY, Alexey
>
> 2006/7/21, Andrew Zhang <zhanghuangzhu@gmail.com>:
> > Hi Vladimir,
> >
> > I noticed the same problem is existing in many places of NIO module.
> >
> > How about writing a utility function for array index exception check? like:
> >
> > void assertArrayIndex(Object[] array, int offset, int length){
> >  if(offset < 0 || length < 0 || (long)offset + (long)length >  array.length
> > ){
> >     throw new IndexOutOfBoundsException();
> >  }
> > }
> >
> > How do you think about it? Any suggestions?
> >
> > Thanks!
> > Best regards,
> >
> >
> > On 7/21/06, Paulex Yang (JIRA) <jira@apache.org> wrote:
> > >
> > >     [ http://issues.apache.org/jira/browse/HARMONY-932?page=all ]
> > >
> > > Paulex Yang closed HARMONY-932.
> > > -------------------------------
> > >
> > >    Estimated Complexity: Novice
> > >
> > > Verified by Vladimir.
> > >
> > > > [classlib][nio]java.nio.?hannel.DatagramChannel.read(ByteBuffer[] , int,
> > > Integer.MAX_VALUE) throws NotYetConnectedException while RI throws
> > > IndexOutOfBoundsException
> > > >
> > > ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > > >
> > > >                 Key: HARMONY-932
> > > >                 URL: http://issues.apache.org/jira/browse/HARMONY-932
> > > >             Project: Harmony
> > > >          Issue Type: Bug
> > > >          Components: Classlib
> > > >            Reporter: Vladimir Ivanov
> > > >         Assigned To: Paulex Yang
> > > >         Attachments: DatagramChannelImpl.patch
> > > >
> > > >
> > > > The Harmony methods java.nio.?hannel.DatagramChannel.read/write(ByteBuffer[]
> > > , int, Integer.MAX_VALUE) throws NotYetConnectedException while RI throws
> > > IndexOutOfBoundsException.
> > > > ==================== test.java ======================
> > > > import java.nio.channels.*;
> > > > import java.nio.*;
> > > > public class test  {
> > > >     public static void main (String[] args) {
> > > >         try {
> > > >             DatagramChannel.open().read(new ByteBuffer[] {}, 2,
> > > Integer.MAX_VALUE);
> > > >         } catch (Exception e) {
> > > >             e.printStackTrace();
> > > >         }
> > > >         try {
> > > >             DatagramChannel.open().write(new ByteBuffer[] {}, 2,
> > > Integer.MAX_VALUE);
> > > >         } catch (Exception e) {
> > > >             e.printStackTrace();
> > > >         }
> > > >     }
> > > > }
> > > > =================================================
> > > > Output:
> > > > C:\tmp\tmp17>C:\jdk1.5.0_06\bin\java.exe -cp . -showversion test
> > > > java version "1.5.0_06"
> > > > Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
> > > > Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode)
> > > > java.lang.IndexOutOfBoundsException
> > > >         at sun.nio.ch.DatagramChannelImpl.read(DatagramChannelImpl.java
> > > :366)
> > > >         at test.main(test.java:8)
> > > > java.lang.IndexOutOfBoundsException
> > > >         at sun.nio.ch.DatagramChannelImpl.write(DatagramChannelImpl.java
> > > :429)
> > > >         at test.main(test.java:13)
> > > > C:\tmp\tmp17>C:\jrockit-jdk1.5.0-windows-ia32\bin\java.exe -cp .
> > > -showversion test
> > > > java version "1.5.0"
> > > > Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
> > > > BEA WebLogic JRockit(R) (build dra-38972-20041208-2001-win-ia32,
> > > R25.0.0-75, GC: System optimized over throughput (initial strategy
> > > singleparpar))
> > > > OutOfMemoryError
> > > > -------end of stacktrace
> > > > C:\tmp\tmp17>C:\harmony\trunk_0427\deploy\jdk\jre\bin\java.exe -cp
.
> > > -showversion test
> > > > java version 1.5 (subset)
> > > > (c) Copyright 1991, 2006 The Apache Software Foundation or its
> > > licensors, as applicable.
> > > > java.nio.channels.NotYetConnectedException
> > > >         at
> > > org.apache.harmony.nio.internal.DatagramChannelImpl.checkOpenConnected(
> > > DatagramChannelImpl.java:567)
> > > >         at org.apache.harmony.nio.internal.DatagramChannelImpl.read(
> > > DatagramChannelImpl.java:387)
> > > >         at test.main(test.java:8)
> > > > java.nio.channels.NotYetConnectedException
> > > >         at
> > > org.apache.harmony.nio.internal.DatagramChannelImpl.checkOpenConnected(
> > > DatagramChannelImpl.java:567)
> > > >         at org.apache.harmony.nio.internal.DatagramChannelImpl.write(
> > > DatagramChannelImpl.java:477)
> > > >         at test.main(test.java:13)
> > > >
> > > C:\tmp\tmp17>C:\harmony\drlvm\trunk\build\win_ia32_msvc_debug\deploy\jre\bin\ij
> > > -Dvm.assert_dialog=false -cp . -showversion test
> > > > Apache Harmony DRLVM HEAD-4807 (2006-05-02), Windows/ia32/msvc 1310,
> > > debug
> > > > java.nio.channels.NotYetConnectedException
> > > >         at
> > > org.apache.harmony.nio.internal.DatagramChannelImpl.checkOpenConnected(
> > > DatagramChannelImpl.java:567)
> > > >         at org.apache.harmony.nio.internal.DatagramChannelImpl.read(
> > > DatagramChannelImpl.java:387)
> > > >         at test.main(test.java:8)
> > > > java.nio.channels.NotYetConnectedException
> > > >         at
> > > org.apache.harmony.nio.internal.DatagramChannelImpl.checkOpenConnected(
> > > DatagramChannelImpl.java:567)
> > > >         at org.apache.harmony.nio.internal.DatagramChannelImpl.write(
> > > DatagramChannelImpl.java:477)
> > > >         at test.main(test.java:13)
> > >
> > > --
> > > This message is automatically generated by JIRA.
> > > -
> > > If you think it was sent incorrectly contact one of the administrators:
> > > http://issues.apache.org/jira/secure/Administrators.jspa
> > > -
> > > For more information on JIRA, see: http://www.atlassian.com/software/jira
> > >
> > >
> > >
> >
> >
> > --
> > Andrew Zhang
> > China Software Development Lab, IBM
> >
> >
>
>
> --
> Alexey A. Petrenko
> Intel Middleware Products Division
>


-- 
Alexey A. Petrenko
Intel Middleware Products Division

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