Examples with ObjectToDataCellConverter org.knime.core.data.util.ObjectToDataCellConverter used on opensource projects

Example 1 with ObjectToDataCellConverter

use of org.knime.core.data.util.ObjectToDataCellConverter in project knime-core by knime.

the class DataContainerTest method testRestoreIntoMemory.

// testBigFile()
/**
 * Restoring into main memory.
 * @see ContainerTable#restoreIntoMemory()
 */
public void testRestoreIntoMemory() {
    // with these setting (50, 100) it will write an 250MB cache file
    // (the latest data this value was checked: 31. August 2006...)
    final int colCount = 50;
    final int rowCount = 100;
    String[] names = new String[colCount];
    DataType[] types = new DataType[colCount];
    for (int c = 0; c < colCount; c++) {
        names[c] = "Column " + c;
        switch(c % 3) {
            case 0:
                types[c] = DoubleCell.TYPE;
                break;
            case 1:
                types[c] = StringCell.TYPE;
                break;
            case 2:
                types[c] = IntCell.TYPE;
                break;
            default:
                throw new InternalError();
        }
    }
    DataTableSpec spec = new DataTableSpec(names, types);
    names = null;
    types = null;
    DataContainer container = new DataContainer(spec, true, 0);
    final ObjectToDataCellConverter conv = new ObjectToDataCellConverter();
    final long seed = System.currentTimeMillis();
    Random rand = new Random(seed);
    for (int i = 0; i < rowCount; i++) {
        DataRow row = createRandomRow(i, colCount, rand, conv);
        container.addRowToTable(row);
        row = null;
    }
    container.close();
    assertTrue(container.getBufferedTable().getBuffer().usesOutFile());
    final Throwable[] throwables = new Throwable[1];
    final ContainerTable table = container.getBufferedTable();
    table.restoreIntoMemory();
    // different iterators restore the content, each of which one row
    RowIterator[] its = new RowIterator[10];
    for (int i = 0; i < its.length; i++) {
        its[i] = table.iterator();
        for (int count = 0; count < i + 1; count++) {
            its[i].next();
        }
    }
    Runnable runnable = new Runnable() {

        @Override
        public void run() {
            try {
                int i = 0;
                Random rand1 = new Random(seed);
                for (RowIterator it = table.iterator(); it.hasNext(); i++) {
                    DataRow row1 = createRandomRow(i, colCount, rand1, conv);
                    DataRow row2 = it.next();
                    assertEquals(row1, row2);
                }
                assertEquals(i, rowCount);
            } catch (Throwable t) {
                throwables[0] = t;
            }
        }
    };
    // Runnable
    // make two threads read the buffer (file) concurrently.
    Thread t1 = new Thread(runnable);
    Thread t2 = new Thread(runnable);
    t1.start();
    t2.start();
    try {
        // seems that the event dispatch thread must not release the
        // reference to the table, otherwise it is (I guess!!) garbage
        // collected: You comment these lines and see the error message.
        t1.join();
        t2.join();
    } catch (InterruptedException ie) {
        ie.printStackTrace();
        fail();
    }
    if (throwables[0] != null) {
        throw new RuntimeException(throwables[0]);
    }
}

Example 2 with ObjectToDataCellConverter

use of org.knime.core.data.util.ObjectToDataCellConverter in project knime-core by knime.

the class DataContainerTest method testBigFile.

// testAddRowToTable()
/**
 * Try a big file :-).
 */
public void testBigFile() {
    // with these setting (50, 1000) it will write an 250MB cache file
    // (the latest data this value was checked: 31. August 2006...)
    final int colCount = 50;
    final int rowCount = 100;
    String[] names = new String[colCount];
    DataType[] types = new DataType[colCount];
    for (int c = 0; c < colCount; c++) {
        names[c] = "Column " + c;
        switch(c % 3) {
            case 0:
                types[c] = DoubleCell.TYPE;
                break;
            case 1:
                types[c] = StringCell.TYPE;
                break;
            case 2:
                types[c] = IntCell.TYPE;
                break;
            default:
                throw new InternalError();
        }
    }
    DataTableSpec spec = new DataTableSpec(names, types);
    names = null;
    types = null;
    DataContainer container = new DataContainer(spec);
    final ObjectToDataCellConverter conv = new ObjectToDataCellConverter();
    final long seed = System.currentTimeMillis();
    Random rand = new Random(seed);
    for (int i = 0; i < rowCount; i++) {
        DataRow row = createRandomRow(i, colCount, rand, conv);
        container.addRowToTable(row);
    }
    container.close();
    final Throwable[] throwables = new Throwable[1];
    final DataTable table = container.getTable();
    Runnable runnable = new Runnable() {

        @Override
        public void run() {
            try {
                int i = 0;
                Random rand1 = new Random(seed);
                for (RowIterator it = table.iterator(); it.hasNext(); i++) {
                    DataRow row1 = createRandomRow(i, colCount, rand1, conv);
                    DataRow row2 = it.next();
                    assertEquals(row1, row2);
                }
                assertEquals(i, rowCount);
            } catch (Throwable t) {
                throwables[0] = t;
            }
        }
    };
    // Runnable
    // make two threads read the buffer (file) concurrently.
    Thread t1 = new Thread(runnable);
    Thread t2 = new Thread(runnable);
    t1.start();
    t2.start();
    try {
        // seems that the event dispatch thread must not release the
        // reference to the table, otherwise it is (I guess!!) garbage
        // collected: You comment these lines and see the error message.
        t1.join();
        t2.join();
    } catch (InterruptedException ie) {
        ie.printStackTrace();
        fail();
    }
    if (throwables[0] != null) {
        throw new RuntimeException(throwables[0]);
    }
}