org.glassfish.grizzly.samples.httpserver.nonblockinghandler.UploadHttpHandlerSample Maven / Gradle / Ivy
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package org.glassfish.grizzly.samples.httpserver.nonblockinghandler;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.ReadHandler;
import org.glassfish.grizzly.http.server.HttpHandler;
import org.glassfish.grizzly.http.server.HttpServer;
import org.glassfish.grizzly.http.server.Request;
import org.glassfish.grizzly.http.server.Response;
import org.glassfish.grizzly.http.server.ServerConfiguration;
import org.glassfish.grizzly.http.io.NIOInputStream;
import org.glassfish.grizzly.http.util.HttpStatus;
/**
* The sample shows how the HttpHandler should be implemented in order to
* store uploaded data into file in non-blocking way.
*
* @author Alexey Stashok
*/
public class UploadHttpHandlerSample {
private static final Logger LOGGER = Grizzly.logger(UploadHttpHandlerSample.class);
public static void main(String[] args) {
// create a basic server that listens on port 8080.
final HttpServer server = HttpServer.createSimpleServer();
// final TCPNIOTransport transport = server.getListeners().iterator().next().getTransport();
// If we want to try direct byte buffers?
// final ByteBufferManager mm = new ByteBufferManager(true, 128 * 1024,
// ByteBufferManager.DEFAULT_SMALL_BUFFER_SIZE);
//
// transport.setMemoryManager(mm);
// transport.setIOStrategy(SameThreadIOStrategy.getInstance());
// transport.setSelectorRunnersCount(4);
final ServerConfiguration config = server.getServerConfiguration();
// Map the path, /upload, to the NonBlockingUploadHandler
config.addHttpHandler(new NonBlockingUploadHandler(), "/upload");
try {
server.start();
LOGGER.info("Press enter to stop the server...");
System.in.read();
} catch (IOException ioe) {
LOGGER.log(Level.SEVERE, ioe.toString(), ioe);
} finally {
server.shutdownNow();
}
}
/**
* This handler using non-blocking streams to read POST data and store it
* to the local file.
*/
private static class NonBlockingUploadHandler extends HttpHandler {
private final AtomicInteger counter = new AtomicInteger();
// -------------------------------------------- Methods from HttpHandler
@Override
public void service(final Request request,
final Response response) throws Exception {
final NIOInputStream in = request.getNIOInputStream(); // get non-blocking InputStream
final FileChannel fileChannel = new FileOutputStream(
"./" + counter.incrementAndGet() + ".upload").getChannel();
response.suspend(); // !!! suspend the Request
// If we don't have more data to read - onAllDataRead() will be called
in.notifyAvailable(new ReadHandler() {
@Override
public void onDataAvailable() throws Exception {
LOGGER.log(Level.FINE, "[onDataAvailable] length: {0}", in.readyData());
storeAvailableData(in, fileChannel);
in.notifyAvailable(this);
}
@Override
public void onError(Throwable t) {
LOGGER.log(Level.WARNING, "[onError]", t);
response.setStatus(500, t.getMessage());
complete(true);
if (response.isSuspended()) {
response.resume();
} else {
response.finish();
}
}
@Override
public void onAllDataRead() throws Exception {
LOGGER.log(Level.FINE, "[onAllDataRead] length: {0}", in.readyData());
storeAvailableData(in, fileChannel);
response.setStatus(HttpStatus.ACCEPTED_202);
complete(false);
response.resume();
}
private void complete(final boolean isError) {
try {
fileChannel.close();
} catch (IOException e) {
if (!isError) {
response.setStatus(500, e.getMessage());
}
}
try {
in.close();
} catch (IOException e) {
if (!isError) {
response.setStatus(500, e.getMessage());
}
}
}
});
}
private static void storeAvailableData(NIOInputStream in, FileChannel fileChannel)
throws IOException {
// Get the Buffer directly from NIOInputStream
final Buffer buffer = in.readBuffer();
// Retrieve ByteBuffer
final ByteBuffer byteBuffer = buffer.toByteBuffer();
try {
while(byteBuffer.hasRemaining()) {
// Write the ByteBuffer content to the file
fileChannel.write(byteBuffer);
}
} finally {
// we can try to dispose the buffer
buffer.tryDispose();
}
}
} // END NonBlockingUploadHandler
}
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