Examples of org.apache.directory.mavibot.btree.PageIO

Package org.apache.directory.mavibot.btree

Examples of org.apache.directory.mavibot.btree.PageIO

org.apache.directory.mavibot.btree.PageIO

A structure containing a Page on disk. It's a byte[PageSize] plus a few more details like the page offset on disk and a link to the next page.
As we may need more than one Page to store some data, the PageIO are linked so that the list of all the PageIO contain the full data.
The first PageIO contains the size of the data.
Here is the logical structure of a PageIO :

 For a first page : +----------+------+----------------------+ | nextPage | size | XXXXXXXXXXXXXXXXXXXX | +----------+------+----------------------+ for any page but the first : +----------+-----------------------------+ | nextPage | XXXXXXXXXXXXXXXXXXXXXXXXXXX | +----------+-----------------------------+ for the last page : +----------+-----------------------------+ |    -1    | XXXXXXXXXXXXXXXXXXXXXXXXXXX | +----------+-----------------------------+ In any case, the page length is always PageSize.

@author Apache Directory Project

        storeMethod.setAccessible( true );
        readIntMethod.setAccessible( true );


        // Allocate some Pages
        PageIO[] pageIos = new PageIO[2];
        pageIos[0] = new PageIO();
        pageIos[0].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[1] = new PageIO();
        pageIos[1].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );


        // Set the int at the beginning
        storeMethod.invoke( recordManager, 0, 0x12345678, pageIos );

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        storeMethod.setAccessible( true );
        readLongMethod.setAccessible( true );


        // Allocate some Pages
        PageIO[] pageIos = new PageIO[2];
        pageIos[0] = new PageIO();
        pageIos[0].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[1] = new PageIO();
        pageIos[1].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );


        // Set the int at the beginning
        storeMethod.invoke( recordManager, 0, 0x0123456789ABCDEFL, pageIos );

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        storeMethod.setAccessible( true );
        readBytesMethod.setAccessible( true );


        // Allocate some Pages
        PageIO[] pageIos = new PageIO[4];
        pageIos[0] = new PageIO();
        pageIos[0].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[1] = new PageIO();
        pageIos[1].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[2] = new PageIO();
        pageIos[2].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[3] = new PageIO();
        pageIos[3].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );


        // We start with 4 bytes
        byte[] bytes = new byte[]
            { 0x01, 0x23, 0x45, 0x67 };

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        storeMethod.setAccessible( true );
        readIntMethod.setAccessible( true );


        // Allocate some Pages
        PageIO[] pageIos = new PageIO[2];
        pageIos[0] = new PageIO();
        pageIos[0].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[1] = new PageIO();
        pageIos[1].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );


        // Set the int at the beginning
        storeMethod.invoke( recordManager, 0, 0x12345678, pageIos );

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        storeMethod.setAccessible( true );
        readLongMethod.setAccessible( true );


        // Allocate some Pages
        PageIO[] pageIos = new PageIO[2];
        pageIos[0] = new PageIO();
        pageIos[0].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[1] = new PageIO();
        pageIos[1].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );


        // Set the int at the beginning
        storeMethod.invoke( recordManager, 0, 0x0123456789ABCDEFL, pageIos );

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        storeMethod.setAccessible( true );
        readBytesMethod.setAccessible( true );


        // Allocate some Pages
        PageIO[] pageIos = new PageIO[4];
        pageIos[0] = new PageIO();
        pageIos[0].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[1] = new PageIO();
        pageIos[1].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[2] = new PageIO();
        pageIos[2].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[3] = new PageIO();
        pageIos[3].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );


        // We start with 4 bytes
        byte[] bytes = new byte[]
            { 0x01, 0x23, 0x45, 0x67 };

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        Method method = RecordManager.class.getDeclaredMethod( "store", long.class, int.class, PageIO[].class );
        method.setAccessible( true );


        // Allocate some Pages
        PageIO[] pageIos = new PageIO[2];
        pageIos[0] = new PageIO();
        pageIos[0].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[1] = new PageIO();
        pageIos[1].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );


        // Set the int at the beginning
        long position = ( Long ) method.invoke( recordManager, 0, 0x12345678, pageIos );

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        Method method = RecordManager.class.getDeclaredMethod( "store", long.class, long.class, PageIO[].class );
        method.setAccessible( true );


        // Allocate some Pages
        PageIO[] pageIos = new PageIO[2];
        pageIos[0] = new PageIO();
        pageIos[0].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[1] = new PageIO();
        pageIos[1].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );


        // Set the long at the beginning
        long position = ( Long ) method.invoke( recordManager, 0, 0x0123456789ABCDEFL, pageIos );

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        Method storeMethod = RecordManager.class.getDeclaredMethod( "store", long.class, byte[].class, PageIO[].class );
        storeMethod.setAccessible( true );


        // Allocate some Pages
        PageIO[] pageIos = new PageIO[4];
        pageIos[0] = new PageIO();
        pageIos[0].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[1] = new PageIO();
        pageIos[1].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[2] = new PageIO();
        pageIos[2].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );
        pageIos[3] = new PageIO();
        pageIos[3].setData( ByteBuffer.allocate( recordManager.getPageSize() ) );


        // We start with 4 bytes
        byte[] bytes = new byte[]
            { 0x01, 0x23, 0x45, 0x67 };

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Related Classes of org.apache.directory.mavibot.btree.PageIO

org.apache.directory.mavibot.btree.PersistedReadTest

org.apache.directory.mavibot.btree.ReadTest

org.apache.directory.mavibot.btree.StoreTest

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