stream.io.TimeStream Maven / Gradle / Ivy
/*
* streams library
*
* Copyright (C) 2011-2012 by Christian Bockermann, Hendrik Blom
*
* streams is a library, API and runtime environment for processing high
* volume data streams. It is composed of three submodules "stream-api",
* "stream-core" and "stream-runtime".
*
* The streams library (and its submodules) is free software: you can
* redistribute it and/or modify it under the terms of the
* GNU Affero General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* The stream.ai library (and its submodules) is distributed in the hope
* that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package stream.io;
import stream.data.Data;
import stream.data.DataFactory;
import stream.util.parser.TimeParser;
/**
* @author chris
*
*/
public class TimeStream extends AbstractDataStream {
String key = "@timestamp";
String interval = "";
Long gap = -1L;
long last = 0L;
/**
* @return the interval
*/
public String getInterval() {
return interval;
}
/**
* @param interval
* the interval to set
*/
public void setInterval(String interval) {
this.interval = interval;
try {
gap = TimeParser.parseTime(interval);
} catch (Exception e) {
gap = -1L;
throw new RuntimeException("Invalid time string '" + interval
+ "': " + e.getMessage());
}
}
/**
* @see stream.io.DataStream#close()
*/
@Override
public void close() {
}
/**
* @see stream.io.AbstractDataStream#readHeader()
*/
@Override
public void readHeader() throws Exception {
}
/**
* @see stream.io.AbstractDataStream#readItem(stream.data.Data)
*/
@Override
public Data readItem(Data instance) throws Exception {
if (instance == null)
instance = DataFactory.create();
Long timestamp = System.currentTimeMillis();
if (gap > 0) {
long t = timestamp - (timestamp % gap);
long t2 = gap - (timestamp - t);
try {
if (t2 > 0)
Thread.sleep(t2);
} catch (Exception e) {
}
timestamp = System.currentTimeMillis();
}
last = timestamp;
instance.put(key, timestamp);
return instance;
}
}