Examples of jdbm.RecordManager

jdbm.RecordManager
An interface to manages records, which are uninterpreted blobs of data.
The set of record operations is simple: fetch, insert, update and delete. Each record is identified using a "rowid" and contains a byte[] data block. Rowids are returned on inserts and you can store them someplace safe to be able to get back to them. Data blocks can be as long as you wish, and may have lengths different from the original when updating. @author Alex Boisvert @author Cees de Groot @version $Id: RecordManager.java,v 1.3 2005/06/25 23:12:31 doomdark Exp $

     */
    public RecordManager createRecordManager( String name,
                                              Properties options )
        throws IOException
    {
        RecordManager  recman;
        String         value;
        int            cacheSize;


        recman = new BaseRecordManager( name );

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                File lgFile = new File( getDatabaseName() + ".lg" );


                // Create temporary store
                File tempDatabase = Files.createTemporayFileOf( dbFile );


                final RecordManager recordManager = RecordManagerFactory.createRecordManager( tempDatabase.getAbsolutePath(), new Properties() );
                ByteArrayComparator comparator = new ByteArrayComparator();
                final BTree index = BTree.createInstance( recordManager, comparator, serializer, DefaultSerializer.INSTANCE, 16 );
                recordManager.setNamedObject( "index", index.getRecid() );
                recordManager.commit();


                try
                {
                    sender.sendTo( new Receiver<String, IOException>()
                    {
                        int counter = 0;


                        @Override
                        public void receive( String item )
                            throws IOException
                        {
                            // Commit one batch
                            if( ( counter++ % 1000 ) == 0 )
                            {
                                recordManager.commit();
                            }


                            String id = item.substring( "{\"identity\":\"".length() );
                            id = id.substring( 0, id.indexOf( '"' ) );


                            // Insert
                            byte[] stateArray = item.getBytes( "UTF-8" );
                            long stateIndex = recordManager.insert( stateArray, serializer );
                            index.insert( id.getBytes( "UTF-8" ), stateIndex, false );
                        }
                    } );
                }
                catch( IOException e )
                {
                    recordManager.close();
                    tempDatabase.delete();
                    throw e;
                }
                catch( Throwable senderThrowableType )
                {
                    recordManager.close();
                    tempDatabase.delete();
                    throw (SenderThrowableType) senderThrowableType;
                }


                // Import went ok - continue
                recordManager.commit();
                // close file handles otherwise Microsoft Windows will fail to rename database files.
                recordManager.close();


                lock.writeLock().lock();
                try
                {
                    // Replace old database with new

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     *  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;
    }

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     *  Basic tests
     */
    @Test
    public void testBasics() throws IOException
    {
        RecordManager recman;
        BTree<byte[], byte[]> tree;
        byte[] test0 = "test0".getBytes();
        byte[] test1 = "test1".getBytes();
        byte[] test2 = "test2".getBytes();
        byte[] test3 = "test3".getBytes();
        byte[] value1 = "value1".getBytes();
        byte[] value2 = "value2".getBytes();


        recman = RecordManagerFactory.createRecordManager( getTemporaryFile( "testBasics" ) );
        tree = new BTree<byte[], byte[]>( recman, new ByteArrayComparator() );


        tree.insert( test1, value1, false );
        tree.insert( test2, value2, false );
        byte[] result = tree.find( test0 );


        assertNull( result );


        result = tree.find( test1 );


        assertNotNull( result );
        assertEquals( 0, ByteArrayComparator.compareByteArray( result, value1 ) );


        result = tree.find( test2 );


        assertNotNull( result );
        assertEquals( 0, ByteArrayComparator.compareByteArray( result, value2 ) );


        result = tree.find( test3 );
        assertNull( result );


        recman.close();
    }

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     *  Basic tests, just use the simple test possibilities of junit (cdaller)
     */
    @Test
    public void testBasics2() throws IOException
    {
        RecordManager recman;
        BTree<byte[], byte[]> tree;
        byte[] test0 = "test0".getBytes();
        byte[] test1 = "test1".getBytes();
        byte[] test2 = "test2".getBytes();
        byte[] test3 = "test3".getBytes();
        byte[] value1 = "value1".getBytes();
        byte[] value2 = "value2".getBytes();


        recman = RecordManagerFactory.createRecordManager( getTemporaryFile( "testBasics2" ) );
        tree = new BTree<byte[], byte[]>( recman, new ByteArrayComparator() );


        tree.insert( test1, value1, false );
        tree.insert( test2, value2, false );


        assertEquals( null, tree.find( test0 ) );
        assertEquals( 0, ByteArrayComparator.compareByteArray( value1, ( byte[] ) tree.find( test1 ) ) );
        assertEquals( 0, ByteArrayComparator.compareByteArray( value2, ( byte[] ) tree.find( test2 ) ) );
        assertEquals( null, ( byte[] ) tree.find( test3 ) );


        recman.close();
    }

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     * (cdaller)
     */
    @Test
    public void testClose() throws IOException
    {
        RecordManager recman;
        BTree<byte[], byte[]> tree;
        byte[] test0 = "test0".getBytes();
        byte[] test1 = "test1".getBytes();
        byte[] test2 = "test2".getBytes();
        byte[] test3 = "test3".getBytes();
        byte[] value1 = "value1".getBytes();
        byte[] value2 = "value2".getBytes();


        recman = RecordManagerFactory.createRecordManager( getTemporaryFile( "testClose" ) );
        tree = new BTree<byte[], byte[]>( recman, new ByteArrayComparator() );


        tree.insert( test1, value1, false );
        tree.insert( test2, value2, false );


        assertEquals( null, tree.find( test0 ) );
        assertEquals( 0, ByteArrayComparator.compareByteArray( value1, ( byte[] ) tree.find( test1 ) ) );
        assertEquals( 0, ByteArrayComparator.compareByteArray( value2, ( byte[] ) tree.find( test2 ) ) );
        assertEquals( null, ( byte[] ) tree.find( test3 ) );


        recman.close();


        try
        {
            tree.browse();
            fail( "Should throw an IllegalStateException on access on not opened btree" );

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     *  Test to insert different objects into one btree. (cdaller)
     */
    @Test
    public void testInsert() throws IOException
    {
        RecordManager recman;
        BTree<String, Object> tree;


        recman = RecordManagerFactory.createRecordManager( getTemporaryFile( "testInsert" ) );
        tree = new BTree<String, Object>( recman, new StringComparator() );


        // insert different objects and retrieve them
        tree.insert( "test1", "value1", false );
        tree.insert( "test2", "value2", false );
        tree.insert( "one", Integer.valueOf( 1 ), false );
        tree.insert( "two", Long.valueOf( 2 ), false );
        tree.insert( "myownobject", new ObjectStore( Integer.valueOf( 234 ) ), false );


        assertEquals( "value2", tree.find( "test2" ) );
        assertEquals( "value1", tree.find( "test1" ) );
        assertEquals( Integer.valueOf( 1 ), tree.find( "one" ) );
        assertEquals( Long.valueOf( 2 ), tree.find( "two" ) );


        // what happens here? must not be replaced, does it return anything?
        // probably yes!
        assertEquals( "value1", tree.insert( "test1", "value11", false ) );
        assertEquals( "value1", tree.find( "test1" ) ); // still the old value?
        assertEquals( "value1", tree.insert( "test1", "value11", true ) );
        assertEquals( "value11", tree.find( "test1" ) ); // now the new value!


        ObjectStore expectedObj = new ObjectStore( Integer.valueOf( 234 ) );
        ObjectStore btreeObj = ( ObjectStore ) tree.find( "myownobject" );


        assertEquals( expectedObj, btreeObj );


        recman.close();
    }

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    @Test
    public void testInsertMany() throws IOException
    {
        BTree<String, String> tree;


        RecordManager recordManager = RecordManagerFactory.createRecordManager( getTemporaryFile( "testInsertMany" ) );
        tree = new BTree<String, String>( recordManager, new StringComparator() );
        tree.setPageSize( 4 );


        // insert different objects and retrieve them
        tree.insert( "test1", "value1", false );
        tree.insert( "test2", "value2", false );
        tree.insert( "test3", "value3", false );
        tree.insert( "test4", "value4", false );
        tree.insert( "test5", "value5", false );
        tree.insert( "test6", "value6", false );


        assertEquals( "value2", tree.find( "test2" ) );
        assertEquals( "value1", tree.find( "test1" ) );


        recordManager.close();
    }

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     *                                      implementation.
     * @throws IllegalArgumentException if some options are invalid.
     */
    public RecordManager createRecordManager( String name, Properties options ) throws IOException
    {
        RecordManager  recman;
        String         value;
        int            cacheSize;


        recman = new BaseRecordManager( name );

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     *  Test to remove  objects from the btree. (cdaller)
     */
    @Test
    public void testRemove() throws IOException
    {
        RecordManager recman;
        BTree<String, Object> tree;


        recman = RecordManagerFactory.createRecordManager( getTemporaryFile( "testRemove" ) );
        tree = new BTree<String, Object>( recman, new StringComparator() );


        tree.insert( "test1", "value1", false );
        tree.insert( "test2", "value2", false );


        assertEquals( "value1", tree.find( "test1" ) );
        assertEquals( "value2", tree.find( "test2" ) );


        tree.remove( "test1" );


        assertEquals( null, tree.find( "test1" ) );
        assertEquals( "value2", tree.find( "test2" ) );


        tree.remove( "test2" );


        assertEquals( null, tree.find( "test2" ) );


        int iterations = 1000;


        for ( int count = 0; count < iterations; count++ )
        {
            tree.insert( "num" + count, Integer.valueOf( count ), false );
        }


        assertEquals( iterations, tree.size() );


        for ( int count = 0; count < iterations; count++ )
        {
            assertEquals( Integer.valueOf( count ), tree.find( "num" + count ) );
        }


        for ( int count = 0; count < iterations; count++ )
        {
            tree.remove( "num" + count );
        }


        assertEquals( 0, tree.size() );


        recman.close();
    }

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Related Classes of jdbm.RecordManager

jdbm.btree.BTreeBench

jdbm.btree.StreamCorrupted

jdbm.btree.TestBPage

jdbm.btree.TestBTree

jdbm.btree.TestBtreeKeyCompression

jdbm.btree.TestInsertPerf

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