| // 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.debug; |
| |
| |
| import streamer.BaseElement; |
| import streamer.ByteBuffer; |
| import streamer.Direction; |
| import streamer.Element; |
| import streamer.Event; |
| import streamer.Link; |
| import streamer.SyncLink; |
| |
| public class FakeSource extends BaseElement { |
| |
| /** |
| * Delay for null packets in poll method when blocking is requested, in |
| * milliseconds. |
| */ |
| protected long delay = SyncLink.STANDARD_DELAY_FOR_EMPTY_PACKET; |
| |
| public FakeSource(String id) { |
| super(id); |
| } |
| |
| @Override |
| public void poll(boolean block) { |
| if (numBuffers > 0 && packetNumber >= numBuffers) { |
| // Close stream when limit of packets is reached |
| sendEventToAllPads(Event.STREAM_CLOSE, Direction.OUT); |
| return; |
| } |
| |
| // Prepare new packet |
| ByteBuffer buf = initializeData(); |
| |
| // Push it to output(s) |
| if (buf != null) |
| pushDataToAllOuts(buf); |
| |
| // Make slight delay when blocking input was requested (to avoid |
| // consuming of 100% in parent loop) |
| if (block) |
| delay(); |
| |
| } |
| |
| /** |
| * Make slight delay. Should be used when blocking input is requested in pull |
| * mode, but null packed was returned by input. |
| */ |
| protected void delay() { |
| try { |
| Thread.sleep(delay); |
| } catch (InterruptedException e) { |
| logger.info("[ignored] interrupted while creating latency", e); |
| } |
| } |
| |
| /** |
| * Initialize data. |
| */ |
| public ByteBuffer initializeData() { |
| ByteBuffer buf = new ByteBuffer(incomingBufLength); |
| |
| // Set first byte of package to it sequance number |
| buf.data[buf.offset] = (byte)(packetNumber % 128); |
| |
| // Initialize rest of bytes with sequential values, which are |
| // corresponding with their position in byte buffer |
| for (int i = buf.offset + 1; i < buf.length; i++) |
| buf.data[i] = (byte)(i % 128); |
| |
| buf.putMetadata(ByteBuffer.SEQUENCE_NUMBER, packetNumber); |
| buf.putMetadata("src", id); |
| |
| return buf; |
| } |
| |
| @Override |
| public String toString() { |
| return "FakeSource(" + id + ")"; |
| } |
| |
| /** |
| * Example. |
| */ |
| public static void main(String args[]) { |
| |
| Element fakeSource = new FakeSource("source 3/10/100") { |
| { |
| verbose = true; |
| incomingBufLength = 3; |
| numBuffers = 10; |
| delay = 100; |
| } |
| }; |
| |
| Element fakeSink = new FakeSink("sink") { |
| { |
| verbose = true; |
| } |
| }; |
| |
| Element fakeSink2 = new FakeSink("sink2") { |
| { |
| verbose = true; |
| } |
| }; |
| |
| Link link = new SyncLink(); |
| |
| fakeSource.setLink(STDOUT, link, Direction.OUT); |
| fakeSink.setLink(STDIN, link, Direction.IN); |
| |
| Link link2 = new SyncLink(); |
| |
| fakeSource.setLink("out2", link2, Direction.OUT); |
| fakeSink2.setLink(STDIN, link2, Direction.IN); |
| |
| link.sendEvent(Event.STREAM_START, Direction.IN); |
| link.run(); |
| |
| } |
| |
| } |