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 void testRollback1b() 
        throws Exception
    {


        // Note: We start out with an empty file
        RecordManager recman =  newRecordManager();


        long root = recman.getNamedObject( "xyz" );
             
        BTree<String,String> tree = null;
        if ( root == 0 ) {
            // create a new one
            tree = BTree.createInstance( recman );
            root = tree.getRecid();
            recman.setNamedObject( "xyz", root );
            recman.commit();
        } else {
            tree = BTree.load( recman, root );
        }


        tree.insert( "Foo", "Bar",true );
        tree.insert( "Fo", "Fum",true );


        recman.commit();


        tree.insert( "Hello", "World",true );


        recman.rollback();


        tree = BTree.load( recman, root );
        assertTrue( tree.find( "Foo" ).equals( "Bar" ) );
        assertTrue( tree.find( "Fo" ).equals( "Fum" ) );
        assertTrue( tree.find( "Hello" ) == null );

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     * Test case courtesy of Derek Dick (mailto:ddick  users.sourceforge.net)
     */
    public void testRollback2b() 
        throws Exception
    {
        RecordManager recman;
        long root;


        // Note: We start out with an empty file
        recman = newRecordManager();


        root = recman.getNamedObject( "xyz" );


        BTree tree = null;
        if ( root == 0 ) {
            // create a new one
            tree = BTree.createInstance( recman );
            root = tree.getRecid();
            recman.setNamedObject( "xyz", root );
            recman.commit();
        } else {
            tree = BTree.load( recman, root );
        }


        tree.insert( "hello", "world",true );
        tree.insert( "goodnight", "gracie",true );
        recman.commit();


        tree.insert( "derek", "dick",true );
        recman.rollback();


        assertTrue( tree.find( "derek" ) == null );
        assertTrue( tree.find( "goodnight" ).equals( "gracie" ) );
        assertTrue( tree.find( "hello" ).equals( "world" ) );
    }

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    /**
     *  Basic tests
     */
    public void testBasics() throws IOException {
        RecordManager  recman;
        BTree          tree;
        byte[]         test, test0, test1, test2, test3;
        byte[]         value1, value2;


        test  = "test".getBytes();
        test0 = "test0".getBytes();
        test1 = "test1".getBytes();
        test2 = "test2".getBytes();
        test3 = "test3".getBytes();


        value1 = "value1".getBytes();
        value2 = "value2".getBytes();


        if ( DEBUG ) {
            System.out.println("TestBTree.testBasics");
        }


        recman = newRecordManager();
        tree = BTree.createInstance( recman, new ByteArrayComparator() );


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


        byte[] result;
        result = (byte[]) tree.find( test0 );
        if ( result != null ) {
            throw new Error( "Test0 shouldn't be found" );
        }


        result = (byte[]) tree.find( test1 );
        if ( result == null || ByteArrayComparator.compareByteArray( result, value1 ) != 0 ) {
            throw new Error( "Invalid value for test1: " + result );
        }


        result = (byte[]) tree.find( test2 );
        if ( result == null || ByteArrayComparator.compareByteArray( result, value2 ) != 0 ) {
            throw new Error( "Invalid value for test2: " + result );
        }


        result = (byte[]) tree.find( test3 );
        if ( result != null ) {
            throw new Error( "Test3 shouldn't be found" );
        }


        recman.close();
    }

View Full Code Here


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


        test  = "test".getBytes();
        test0 = "test0".getBytes();
        test1 = "test1".getBytes();
        test2 = "test2".getBytes();
        test3 = "test3".getBytes();


        value1 = "value1".getBytes();
        value2 = "value2".getBytes();


        if ( DEBUG )
            System.out.println("TestBTree.testBasics2");


        recman = newRecordManager();
        tree = BTree.createInstance( 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)
     */
    public void testClose()
        throws IOException
    {
        RecordManager  recman;
        BTree          tree;
        byte[]         test, test0, test1, test2, test3;
        byte[]         value1, value2;


        test  = "test".getBytes();
        test0 = "test0".getBytes();
        test1 = "test1".getBytes();
        test2 = "test2".getBytes();
        test3 = "test3".getBytes();


        value1 = "value1".getBytes();
        value2 = "value2".getBytes();


        if ( DEBUG )
            System.out.println("TestBTree.testClose");


        recman = newRecordManager();
        tree = BTree.createInstance( 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");
        } catch( IllegalStateException except ) {

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


        if ( DEBUG )
            System.out.println("TestBTree.testInsert");


        recman = newRecordManager();
        tree = BTree.createInstance( recman);


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


        assertEquals("value2",(String)tree.find("test2"));
        assertEquals("value1",(String)tree.find("test1"));
        assertEquals(new Integer(1),(Integer)tree.find("one"));
        assertEquals(new Long(2),(Long)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!


        ObjectTT expected_obj = new ObjectTT(new Integer(234));
        ObjectTT btree_obj = (ObjectTT)tree.find("myownobject");
        assertEquals(expected_obj, btree_obj);


        recman.close();
    }

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


        if ( DEBUG ) {
            System.out.println( "TestBTree.testRemove" );
        }


        recman = newRecordManager();
        tree = BTree.createInstance( recman);


        tree.insert("test1", "value1",false);
        tree.insert("test2","value2",false);
        assertEquals("value1",(String)tree.find("test1"));
        assertEquals("value2",(String)tree.find("test2"));
        tree.remove("test1");
        assertEquals(null,(String)tree.find("test1"));
        assertEquals("value2",(String)tree.find("test2"));
        tree.remove("test2");
        assertEquals(null,(String)tree.find("test2"));


        int iterations = 1000;


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


        assertEquals( iterations, tree.size() );


        for ( int count = 0; count < iterations; count++ ) {
            assertEquals( new Integer( 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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     *  Test to find differents objects in the btree. (cdaller)
     */
    public void testFind()
        throws IOException
    {
        RecordManager  recman;
        BTree          tree;


        if ( DEBUG )
            System.out.println("TestBTree.testFind");


        recman = newRecordManager();
        tree = BTree.createInstance( recman);


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


        Object value = tree.find("test1");
        assertTrue(value instanceof String);
        assertEquals("value1",value);


        tree.insert("","Empty String as key",false);
        assertEquals("Empty String as key",(String)tree.find(""));


        assertEquals(null,(String)tree.find("someoneelse"));


        recman.close();
    }

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    return l;
  }
  
  
  public void testSecondaryTreeMap() throws IOException{
    RecordManager r = newRecordManager();
    PrimaryTreeMap<Integer, String> m = r.treeMap("aa");
    SecondaryTreeMap<Integer, Integer, String> s = m.secondaryTreeMap("bb", 
        new SecondaryKeyExtractor<Integer, Integer, String>() {


      public Integer extractSecondaryKey(Integer key, String value) {        
        return value.length();

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     *  should be removed from the recordmanager.
     */
    public void testDelete()
        throws IOException
    {
        RecordManager  recman;
        BTree<String, Serializable>          tree;
        if ( DEBUG )
            System.out.println("TestBTree.testFind");
        Properties props = new Properties();
        recman = RecordManagerFactory.createRecordManager( newTestFile(), props );
        tree = BTree.createInstance( recman);


        // put enough data into the tree so we definitely have multiple pages
        for (int count = 1; count <= 1000; count++){
            tree.insert("num" + count,new Integer(count),false);
            if (count % 100 == 0)
                recman.commit();
        }
        List<Long> out = new ArrayList<Long>();
        tree.dumpChildPageRecIDs(out);        
        assertTrue(out.size() > 0);
    }

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jdbm.btree.TestBPage

jdbm.btree.TestBTree

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jdbm.btree.TestInsertPerf

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