Examples of org.vfny.geoserver.util.PartialBufferedOutputStream2

org.vfny.geoserver.util.PartialBufferedOutputStream2
PartialBufferedOutputStream
Oct 19, 2005
Purpose:
I have modelled this class after the BufferedOutputStream. Several methods are synchronized as a result. The interior of this class uses a ByteArrayOutputStream when it starts and then a BufferedOutputStream. This is essentially a decorator. This class uses a temporary to-memory OutputStream for initial bufferring. This OutputStream is a ByteArrayOutputStream. Once a pre-defined BUFFER_SIZE has been reached, the output that is stored in the ByteArrayOutputStream is output to the real OutputStream to the response. Further data is then written to that response OutputStream. For the first run of this, we will write to memory for the buffered part. Writing to disk is another option. NOTE: If we switch to writing out to disk, we will have to clean up our temporary files with abort(). WARNING: IF you abuse the size of the buffer, you may leak memory if this OutputStream is not terminated. The ByteArrayOutputStream will hold onto its allocated memory even after you call reset() on it. So if you put in 60MB of buffer space, it will stay there until the object is no longer referenced and the garbage collector decides to pick it up. A solution to this would be to use a FileOutputStream instead of the ByteArrayOutputStream. CONTRACT: -close() will NOT flush remaining bytes to the output stream, as per the contract with OutputStream. Close will remove any references to OutputStreams and its HttpServletResponse. -fush() will NOT flush if the buffer is not full. -abort() will succeed if the buffer is not full yet. If the buffer has been filled and the information has been written out to response's OutputStream, the abort reports as having failed. The point of this PartialBufferedOutputStream is to allow an abort before the information has been written out to the real OutputStream. When abort is called the references to any OutputStreams and the HttpServletResponse are removed. @author Brent Owens (The Open Planning Project) @version

     *
     * @see org.vfny.geoserver.servlets.AbstractService.ServiceStrategy#getDestination(javax.servlet.http.HttpServletResponse)
     */
    public DispatcherOutputStream getDestination(HttpServletResponse response)
        throws IOException {
        out = new PartialBufferedOutputStream2(response, bufferedSize());


        return new DispatcherOutputStream(out);
    }

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     *
     * @see org.vfny.geoserver.servlets.AbstractService.ServiceStrategy#getDestination(javax.servlet.http.HttpServletResponse)
     */
    public DispatcherOutputStream getDestination(HttpServletResponse response)
        throws IOException {
        out = new PartialBufferedOutputStream2(response, bufferedSize());


        return new DispatcherOutputStream(out);
    }

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public class PartialBufferOutputStream2Test extends TestCase {


    public void testFlushOnClose() throws IOException  {
        MockHttpServletResponse mockResponse = new MockHttpServletResponse();
        PartialBufferedOutputStream2 pbos = new PartialBufferedOutputStream2(mockResponse);
        PrintStream ps = new PrintStream(pbos);
        ps.print("Hello world!");
        ps.close();
        
        // check the in memory buffer has been flushed to the target output stream

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     *
     * @see org.vfny.geoserver.servlets.AbstractService.ServiceStrategy#getDestination(javax.servlet.http.HttpServletResponse)
     */
    public DispatcherOutputStream getDestination(HttpServletResponse response)
        throws IOException {
        out = new PartialBufferedOutputStream2(response, bufferedSize());


        return new DispatcherOutputStream(out);
    }

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public class PartialBufferOutputStream2Test {


    @Test
    public void testFlushOnClose() throws IOException  {
        MockHttpServletResponse mockResponse = new MockHttpServletResponse();
        PartialBufferedOutputStream2 pbos = new PartialBufferedOutputStream2(mockResponse);
        PrintStream ps = new PrintStream(pbos);
        ps.print("Hello world!");
        ps.close();
        
        // check the in memory buffer has been flushed to the target output stream

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org.geoserver.util.PartialBufferOutputStream2Test

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