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From "Tim Ellison (JIRA)" <j...@apache.org>
Subject [jira] Closed: (HARMONY-2417) [classlib][nio] java.nio.MappedByteBuffer.isLoaded() returns true while RI returns false
Date Thu, 22 Nov 2007 16:21:43 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-2417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tim Ellison closed HARMONY-2417.
--------------------------------

    Resolution: Cannot Reproduce
      Assignee: Tim Ellison

Artem,

Feel free to re-open if you can reproduce it.


> [classlib][nio] java.nio.MappedByteBuffer.isLoaded() returns true while RI returns false
> ----------------------------------------------------------------------------------------
>
>                 Key: HARMONY-2417
>                 URL: https://issues.apache.org/jira/browse/HARMONY-2417
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>            Reporter: Artem Aliev
>            Assignee: Tim Ellison
>            Priority: Minor
>
> According to J2SE API specifications of java.nio.MappedByteBuffer class
> public final boolean isLoaded()
>     Tells whether or not this buffer's content is resident in physical memory. 
>     A return value of true implies that it is highly likely that all of the 
>     data in this buffer is resident in physical memory and may therefore be 
>     accessed without incurring any virtual-memory page faults or I/O 
>     operations. A return value of false does not necessarily imply that the 
>     buffer's content is not resident in physical memory. 
>     The returned value is a hint, rather than a guarantee, because the 
>     underlying operating system may have paged out some of the buffer's data by 
>     the time that an invocation of this method returns. 
> Returns: 
>     true if it is likely that this buffer's content is resident in physical 
>     memory
> When some MappedByteBuffer was created by FaileChannel.map(...) method then 
> all bytes from the file are put to the buffer but
> MappedByteBuffer.isloaded() returns on Harmony different results on Windows
> and Linux.
> This method returns:
>     - On Harmony: false on Windows and true - on Linux
>     - On RI: always returns false (on Windows and Linux)
> Code for reproducing:
> ---------------------HT.java--------------
> import java.nio.*;
> import java.nio.channels.*;
> import java.io.*;
> import junit.framework.TestCase;
> public class HT extends TestCase {
>     public void testMap() {
>         File tempFile = new File("./", "tempFile.txt");
>         tempFile.deleteOnExit();
>         String testString = "1234567890 - Proba pera";
>         try {
>             FileOutputStream fos = new FileOutputStream(tempFile);
>             for (int i = 0; i < testString.length(); i++) {
>                 fos.write(testString.charAt(i));
>             }
>             fos.close();
>         } catch (IOException e) {
>             e.printStackTrace();
>             fail("Unexpected error on file initialization");
>         }
>         FileInputStream fis = null;
>         MappedByteBuffer mappedBuf = null;
>         int fileLength = 0;
>         try {
>             fis = new FileInputStream(tempFile);
>         } catch (FileNotFoundException e) {
>             e.printStackTrace();
>             fail("Unexpected exception: Can't open file");
>         }
>         FileChannel channel = fis.getChannel();
>         try {
>             fileLength = (int) channel.size();
>             mappedBuf = channel.map(FileChannel.MapMode.READ_ONLY, 0,
> fileLength);
>         } catch (IOException e) {
>            e.printStackTrace();
>            fail("Unexpected exception: "+e );
>         }
>         System.out.println("File length: "+fileLength+"  Buf capacity:
> "+mappedBuf.capacity());
>         if (fileLength != mappedBuf.capacity()) {
>             fail("Incorrect capacity");
>         }
>         for (int i = 0; i < fileLength; i++) {
>             int c1 = mappedBuf.get();
>             int c2 = (int)testString.charAt(i);
>             if (c1 != c2) {
>                 System.out.println("Incorrect char ("+i+") : "+c1 +"  must be:
> "+c2);
>                 return;
>             }
>         }
>         System.out.println("File and Buffer contain the same chars");
>         System.out.println("isLoaded(): "+mappedBuf.isLoaded());
>     }
> }
> ---------------------------------------
> Steps to Reproduce:
> Create HT class and run it
> java -cp .:junit.jar junit.textui.TestRunner HT
> Output:
> - On Linux (RI)
> 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-linux-ia32, R25.0.0-75,
> GC: System optimized over throughput (initial strategy singleparpar))
> .File length: 23  Buf capacity: 23
> File and Buffer contain the same chars
> isLoaded(): false
> Time: 0.037
> OK (1 test)
> - On Linux (Harmony)
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software
> Foundation or its licensors, as applicable.
> java version "1.5.0" 
> pre-alpha : not complete or compatible
> svn = rsvn: '.' is not a working copy, (Sep 26 2006), Linux/ia32/gcc 3.3.3,
> release build
> http://incubator.apache.org/harmony
> .File length: 23  Buf capacity: 23
> File and Buffer contain the same chars
> isLoaded(): true
> F
> Time: 0.029
> There was 1 failure:
> 1) testMap(HT)junit.framework.AssertionFailedError: isLoaded()
>         at HT.testMap(HT.java:60)
>         at java.lang.reflect.VMReflection.invokeMethod(Native Method)
> FAILURES!!!
> Tests run: 1,  Failures: 1,  Errors: 0
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software
> Foundation or its licensors, as applicable.
> .File length: 23  Buf capacity: 23
> File and Buffer contain the same chars
> isLoaded(): true
> F
> Time: 0.015
> There was 1 failure:
> 1) testMap(HT)junit.framework.AssertionFailedError: isLoaded()
>         at HT.testMap(HT.java:60)
>         at java.lang.reflect.AccessibleObject.invokeV(AccessibleObject.java:25)
> FAILURES!!!
> Tests run: 1,  Failures: 1,  Errors: 0
> - On Windows ( RI )
> 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)
> .File length: 23  Buf capacity: 23
> File and Buffer contain the same chars
> isLoaded(): false
> Time: 0.032
> OK (1 test)
> - On Windows (Harmony)
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software
> Foundation or its l
> icensors, as applicable.
> java version "1.5.0"
> pre-alpha : not complete or compatible
> svn = rsvn: '.' is not a working copy, (Sep 26 2006), Windows/ia32/msvc 1310,
> release buil
> d
> http://incubator.apache.org/harmony
> .File length: 23  Buf capacity: 23
> File and Buffer contain the same chars
> isLoaded(): false
> Time: 0.031
> OK (1 test)

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