cloudstack/services/console-proxy-rdp/rdpconsole/src/main/java/streamer/OutputStreamSink.java

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
package streamer;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class OutputStreamSink extends BaseElement {

  protected OutputStream os;
  protected SocketWrapper socketWrapper;

  public OutputStreamSink(String id) {
    super(id);
  }

  public OutputStreamSink(String id, OutputStream os) {
    super(id);
    this.os = os;
  }

  public OutputStreamSink(String id, SocketWrapper socketWrapper) {
    super(id);
    this.socketWrapper = socketWrapper;
  }

  public void setOutputStream(OutputStream os) {
    this.os = os;
    // Resume links
    resumeLinks();
  }

  /**
   * Send incoming data to stream.
   */
  @Override
  public void handleData(ByteBuffer buf, Link link) {
    if (buf == null)
      return;

    try {
      if (verbose)
        System.out.println("[" + this + "] INFO: Writing data to stream: " + buf + ".");

      os.write(buf.data, buf.offset, buf.length);
      os.flush();
    } catch (IOException e) {
      System.err.println("[" + this + "] ERROR: " + e.getMessage());
      closeStream();
    }
  }

  @Override
  public void handleEvent(Event event, Direction direction) {
    switch (event) {
    case SOCKET_UPGRADE_TO_SSL:
      socketWrapper.upgradeToSsl();
      break;
    default:
      super.handleEvent(event, direction);
    }
  }

  @Override
  public void setLink(String padName, Link link, Direction direction) {
    switch (direction) {
    case IN:
      super.setLink(padName, link, direction);

      if (os == null)
        // Pause links until data stream will be ready
        link.pause();
      break;
    case OUT:
      throw new RuntimeException("Cannot assign link to output pad in sink element. Element: " + this + ", pad: " + padName + ", link: " + link + ".");
    }
  }

  private void resumeLinks() {
    for (DataSource source : inputPads.values())
      ((Link) source).resume();
  }

  @Override
  protected void onClose() {
    closeStream();
  }

  private void closeStream() {
    if (verbose)
      System.out.println("[" + this + "] INFO: Closing stream.");

    try {
      os.close();
    } catch (IOException e) {
    }
    try {
      sendEventToAllPads(Event.STREAM_CLOSE, Direction.IN);
    } catch (Exception e) {
    }
  }

  @Override
  public String toString() {
    return "OutputStreamSink(" + id + ")";
  }

  /**
   * Example.
   */
  public static void main(String args[]) {
    Element source = new FakeSource("source") {
      {
        this.verbose = true;
        this.numBuffers = 3;
        this.incommingBufLength = 5;
        this.delay = 100;
      }
    };

    OutputStreamSink sink = new OutputStreamSink("sink") {
      {
        verbose = true;
      }
    };

    Link link = new SyncLink();

    source.setLink(STDOUT, link, Direction.OUT);
    sink.setLink(STDIN, link, Direction.IN);

    sink.setOutputStream(new ByteArrayOutputStream());

    link.sendEvent(Event.STREAM_START, Direction.IN);
    link.run();

  }
}