Examples of org.apache.commons.fileupload.DeferredFileOutputStream

org.apache.commons.fileupload.DeferredFileOutputStream

An output stream which will retain data in memory until a specified threshold is reached, and only then commit it to disk. If the stream is closed before the threshold is reached, the data will not be written to disk at all.
@author Martin Cooper @version $Id: DeferredFileOutputStream.java,v 1.2 2003/05/31 22:31:08 martinc Exp $

     * Tests the case where the amount of data falls below the threshold, and
     * is therefore confined to memory.
     */
    public void testBelowThreshold()
    {
        DeferredFileOutputStream dfos =
                new DeferredFileOutputStream(testBytes.length + 42, null);
        try
        {
            dfos.write(testBytes, 0, testBytes.length);
            dfos.close();
        }
        catch (IOException e) {
            fail("Unexpected IOException");
        }
        assertTrue(dfos.isInMemory());


        byte[] resultBytes = dfos.getData();
        assertTrue(resultBytes.length == testBytes.length);
        assertTrue(Arrays.equals(resultBytes, testBytes));
    }

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     * Tests the case where the amount of data is exactly the same as the
     * threshold. The behavior should be the same as that for the amount of
     * data being below (i.e. not exceeding) the threshold.
     */
    public void testAtThreshold() {
        DeferredFileOutputStream dfos =
                new DeferredFileOutputStream(testBytes.length, null);
        try
        {
            dfos.write(testBytes, 0, testBytes.length);
            dfos.close();
        }
        catch (IOException e) {
            fail("Unexpected IOException");
        }
        assertTrue(dfos.isInMemory());


        byte[] resultBytes = dfos.getData();
        assertTrue(resultBytes.length == testBytes.length);
        assertTrue(Arrays.equals(resultBytes, testBytes));
    }

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        File testFile = new File("testAboveThreshold.dat");


        // Ensure that the test starts from a clean base.
        testFile.delete();


        DeferredFileOutputStream dfos =
                new DeferredFileOutputStream(testBytes.length - 5, testFile);
        try
        {
            dfos.write(testBytes, 0, testBytes.length);
            dfos.close();
        }
        catch (IOException e) {
            fail("Unexpected IOException");
        }
        assertFalse(dfos.isInMemory());
        assertNull(dfos.getData());


        verifyResultFile(testFile);


        // Ensure that the test starts from a clean base.
        testFile.delete();

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        File testFile = new File("testThresholdReached.dat");


        // Ensure that the test starts from a clean base.
        testFile.delete();


        DeferredFileOutputStream dfos =
                new DeferredFileOutputStream(testBytes.length / 2, testFile);
        int chunkSize = testBytes.length / 3;


        try
        {
            dfos.write(testBytes, 0, chunkSize);
            dfos.write(testBytes, chunkSize, chunkSize);
            dfos.write(testBytes, chunkSize * 2,
                    testBytes.length - chunkSize * 2);
            dfos.close();
        }
        catch (IOException e) {
            fail("Unexpected IOException");
        }
        assertFalse(dfos.isInMemory());
        assertNull(dfos.getData());


        verifyResultFile(testFile);


        // Ensure that the test starts from a clean base.
        testFile.delete();

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org.apache.commons.fileupload.DeferredFileOutputStreamTest

java.io.FileOutputStream

java.io.ByteArrayOutputStream

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