| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.fcgi.generator; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayDeque; |
| import java.util.Queue; |
| |
| import org.eclipse.jetty.io.EndPoint; |
| import org.eclipse.jetty.util.IteratingCallback; |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| |
| public class Flusher |
| { |
| private static final Logger LOG = Log.getLogger(Flusher.class); |
| |
| private final Queue<Generator.Result> queue = new ArrayDeque<>(); |
| private final IteratingCallback flushCallback = new FlushCallback(); |
| private final EndPoint endPoint; |
| |
| public Flusher(EndPoint endPoint) |
| { |
| this.endPoint = endPoint; |
| } |
| |
| public void flush(Generator.Result... results) |
| { |
| for (Generator.Result result : results) |
| offer(result); |
| flushCallback.iterate(); |
| } |
| |
| private void offer(Generator.Result result) |
| { |
| synchronized (this) |
| { |
| queue.offer(result); |
| } |
| } |
| |
| private Generator.Result poll() |
| { |
| synchronized (this) |
| { |
| return queue.poll(); |
| } |
| } |
| |
| public void shutdown() |
| { |
| flush(new ShutdownResult()); |
| } |
| |
| private class FlushCallback extends IteratingCallback |
| { |
| private Generator.Result active; |
| |
| @Override |
| protected Action process() throws Exception |
| { |
| // Look if other writes are needed. |
| Generator.Result result = poll(); |
| if (result == null) |
| { |
| // No more writes to do, return. |
| return Action.IDLE; |
| } |
| |
| // Attempt to gather another result. |
| // Most often there is another result in the |
| // queue so this is a real optimization because |
| // it sends both results in just one TCP packet. |
| Generator.Result other = poll(); |
| if (other != null) |
| result = result.join(other); |
| |
| active = result; |
| ByteBuffer[] buffers = result.getByteBuffers(); |
| endPoint.write(this, buffers); |
| return Action.SCHEDULED; |
| } |
| |
| @Override |
| protected void onCompleteSuccess() |
| { |
| // We never return Action.SUCCEEDED, so this method is never called. |
| throw new IllegalStateException(); |
| } |
| |
| @Override |
| public void succeeded() |
| { |
| if (active != null) |
| active.succeeded(); |
| active = null; |
| super.succeeded(); |
| } |
| |
| @Override |
| public void onCompleteFailure(Throwable x) |
| { |
| if (active != null) |
| active.failed(x); |
| active = null; |
| |
| while (true) |
| { |
| Generator.Result result = poll(); |
| if (result == null) |
| break; |
| result.failed(x); |
| } |
| } |
| } |
| |
| private class ShutdownResult extends Generator.Result |
| { |
| private ShutdownResult() |
| { |
| super(null, null); |
| } |
| |
| @Override |
| public void succeeded() |
| { |
| shutdown(); |
| } |
| |
| @Override |
| public void failed(Throwable x) |
| { |
| shutdown(); |
| } |
| |
| private void shutdown() |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Shutting down {}", endPoint); |
| endPoint.shutdownOutput(); |
| } |
| } |
| } |