| // 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.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.log4j.Logger; |
| |
| import streamer.debug.FakeSink; |
| |
| /** |
| * Source element, which reads data from InputStream. |
| */ |
| public class InputStreamSource extends BaseElement { |
| private static final Logger s_logger = Logger.getLogger(InputStreamSource.class); |
| |
| protected InputStream is; |
| protected SocketWrapperImpl socketWrapper; |
| |
| public InputStreamSource(String id) { |
| super(id); |
| } |
| |
| public InputStreamSource(String id, InputStream is) { |
| super(id); |
| this.is = is; |
| } |
| |
| public InputStreamSource(String id, SocketWrapperImpl socketWrapper) { |
| super(id); |
| this.socketWrapper = socketWrapper; |
| } |
| |
| @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 OUT: |
| super.setLink(padName, link, direction); |
| |
| if (is == null) { |
| // Pause links until data stream will be ready |
| link.pause(); |
| } |
| break; |
| case IN: |
| throw new RuntimeException("Cannot assign link to input pad in source element. Element: " + this + ", pad: " + padName + ", link: " + link + "."); |
| } |
| } |
| |
| public void setInputStream(InputStream is) { |
| this.is = is; |
| |
| // Resume links |
| resumeLinks(); |
| } |
| |
| private void resumeLinks() { |
| for (DataSink sink : outputPads.values()) |
| ((Link)sink).resume(); |
| } |
| |
| /** |
| * Read data from input stream. |
| */ |
| @Override |
| public void poll(boolean block) { |
| try { |
| if (!block && is.available() == 0) { |
| |
| if (verbose) |
| System.out.println("[" + this + "] INFO: No data in stream is available now, returning."); |
| |
| return; |
| } |
| |
| // Create buffer of recommended size and with default offset |
| ByteBuffer buf = new ByteBuffer(incommingBufLength); |
| |
| if (verbose) |
| System.out.println("[" + this + "] INFO: Reading data from stream."); |
| |
| int actualLength = is.read(buf.data, buf.offset, buf.data.length - buf.offset); |
| |
| if (actualLength < 0) { |
| if (verbose) |
| System.out.println("[" + this + "] INFO: End of stream."); |
| |
| buf.unref(); |
| closeStream(); |
| sendEventToAllPads(Event.STREAM_CLOSE, Direction.OUT); |
| return; |
| } |
| |
| if (actualLength == 0) { |
| if (verbose) |
| System.out.println("[" + this + "] INFO: Empty buffer is read from stream."); |
| |
| buf.unref(); |
| return; |
| } |
| |
| buf.length = actualLength; |
| |
| if (verbose) |
| System.out.println("[" + this + "] INFO: Data read from stream: " + buf + "."); |
| |
| pushDataToAllOuts(buf); |
| |
| } catch (IOException e) { |
| System.err.println("[" + this + "] ERROR: " + e.getMessage()); |
| closeStream(); |
| } |
| } |
| |
| @Override |
| protected void onClose() { |
| closeStream(); |
| } |
| |
| private void closeStream() { |
| if (verbose) |
| System.out.println("[" + this + "] INFO: Closing stream."); |
| |
| try { |
| is.close(); |
| } catch (IOException e) { |
| s_logger.info("[ignored]" |
| + "io error on input stream: " + e.getLocalizedMessage()); |
| } |
| try { |
| sendEventToAllPads(Event.STREAM_CLOSE, Direction.OUT); |
| } catch (Exception e) { |
| s_logger.info("[ignored]" |
| + "error sending an event to all pods: " + e.getLocalizedMessage()); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return "InputStreamSource(" + id + ")"; |
| } |
| |
| /** |
| * Example. |
| */ |
| public static void main(String args[]) { |
| InputStream is = new ByteArrayInputStream(new byte[] {1, 2, 3}); |
| |
| InputStreamSource source = new InputStreamSource("source") { |
| { |
| verbose = true; |
| } |
| }; |
| Element fakeSink = new FakeSink("sink") { |
| { |
| verbose = true; |
| } |
| }; |
| |
| Link link = new SyncLink() { |
| { |
| verbose = true; |
| } |
| }; |
| |
| source.setLink(STDOUT, link, Direction.OUT); |
| fakeSink.setLink(STDIN, link, Direction.IN); |
| |
| source.setInputStream(is); |
| |
| link.sendEvent(Event.STREAM_START, Direction.OUT); |
| link.run(); |
| |
| } |
| |
| } |