// 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 streamer.debug.FakeSink;
/**
* Source element, which reads data from InputStream.
*/
public class InputStreamSource extends BaseElement {
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) {
}
try {
sendEventToAllPads(Event.STREAM_CLOSE, Direction.OUT);
} catch (Exception e) {
}
}
@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();
}
}