// 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) {
}
}
/**
* Initialize data.
*/
public ByteBuffer initializeData() {
ByteBuffer buf = new ByteBuffer(incommingBufLength);
// 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;
this.incommingBufLength = 3;
this.numBuffers = 10;
this.delay = 100;
}
};
Element fakeSink = new FakeSink("sink") {
{
this.verbose = true;
}
};
Element fakeSink2 = new FakeSink("sink2") {
{
this.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();
}
}