stream.logger.Message 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.logger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import stream.ConditionedProcessor;
import stream.ProcessContext;
import stream.annotations.Description;
import stream.data.Data;
import stream.expressions.Expression;
import stream.expressions.ExpressionResolver;
import stream.io.CsvWriter;
/**
* @author chris
*
*/
@Description(text = "", group = "Data Stream.Monitoring")
public class Message extends ConditionedProcessor {
static Logger log = LoggerFactory.getLogger(CsvWriter.class);
protected Expression filter;
protected String txt;
protected String condition;
public void setMessage(String msg) {
if (msg == null)
this.txt = "";
else
this.txt = msg;
}
public String getMessage() {
return txt;
}
/**
* @see stream.AbstractProcessor#init(stream.Context)
*/
@Override
public void init(ProcessContext ctx) throws Exception {
super.init(ctx);
}
/**
* @see stream.DataProcessor#process(stream.data.Data)
*/
@Override
public Data processMatchingData(Data data) {
if (filter == null || filter.matches(context, data)) {
Object o = ExpressionResolver.expand(getMessage(), context, data);
if (o != null)
log.info(o.toString());
}
return data;
}
}