/**
* JDBM LICENSE v1.00
*
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. The name "JDBM" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Cees de Groot. For written permission,
* please contact cg@cdegroot.com.
*
* 4. Products derived from this Software may not be called "JDBM"
* nor may "JDBM" appear in their names without prior written
* permission of Cees de Groot.
*
* 5. Due credit should be given to the JDBM Project
* (http://jdbm.sourceforge.net/).
*
* THIS SOFTWARE IS PROVIDED BY THE JDBM PROJECT AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* CEES DE GROOT OR ANY CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 2000 (C) Cees de Groot. All Rights Reserved.
* Contributions are Copyright (C) 2000 by their associated contributors.
*
*/
package jdbm.btree;
import jdbm.RecordManager;
import jdbm.RecordManagerFactory;
import jdbm.helper.StringComparator;
import jdbm.btree.BTree;
import java.io.File;
import java.io.IOException;
import org.junit.Test;
/**
* Contributed test case for BTree by Christof Dallermassl (cdaller@iicm.edu):
*
* -= quote from original message posted on jdbm-general =-
* <pre>
*
* I tried to insert a couple of elements into a BTree and then remove
* them one by one. After a number or removals, there is always (if more
* than 20 elements in btree) a java.io.StreamCorruptedException thrown.
*
* The strange thing is, that on 50 elements, the exception is thrown
* after removing 22, on 200 it is thrown after 36, on 1000 it is thrown
* after 104, on 10000 it is thrown after 1003....
*
* The full stackTrace is here:
* ---------------------- snip ------- snap -------------------------
* java.io.StreamCorruptedException: Caught EOFException while reading the
* stream header
* at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:845)
* at java.io.ObjectInputStream.<init>(ObjectInputStream.java:168)
* at jdbm.recman.RecordManager.byteArrayToObject(RecordManager.java:296)
* at jdbm.recman.RecordManager.fetchObject(RecordManager.java:239)
* at jdbm.helper.ObjectCache.fetchObject(ObjectCache.java:104)
* at jdbm.btree.BPage.loadBPage(BPage.java:670)
* at jdbm.btree.BPage.remove(BPage.java:492)
* at jdbm.btree.BPage.remove(BPage.java:437)
* at jdbm.btree.BTree.remove(BTree.java:313)
* at JDBMTest.main(JDBMTest.java:41)
*
* </pre>
*
* @author <a href="mailto:cdaller@iicm.edu">Christof Dallermassl</a>
*/
public class StreamCorrupted
{
public final static String testFileName = "test";
public static void deleteFile( String filename )
{
File file = new File( filename );
if ( file.exists() ) {
try
{
file.delete();
}
catch ( Exception except )
{
except.printStackTrace();
}
if ( file.exists() )
{
System.out.println( "WARNING: Cannot delete file: " + file );
}
}
}
public static void deleteTestFile()
{
System.gc();
deleteFile( testFileName);
deleteFile( testFileName + ".db" );
deleteFile( testFileName + ".lg" );
}
/**
* Basic tests
*/
@Test
public void testStreamCorrupted() throws IOException
{
RecordManager recman;
BTree<String, Integer> btree;
int iterations;
iterations = 100; // 23 works :-(((((
// open database
recman = RecordManagerFactory.createRecordManager( testFileName );
// create a new B+Tree data structure
btree = new BTree<String, Integer>( recman, new StringComparator() );
recman.setNamedObject( "testbtree", btree.getRecordId() );
// action:
// insert data
for( int count = 0; count < iterations; count++ )
{
btree.insert( "num" + count, Integer.valueOf( count ), true );
}
// delete data
for( int count = 0; count < iterations; count++ )
{
btree.remove( "num" + count );
}
// close database
recman.close();
recman = null;
}
}