/**
* Licensed to Cloudera, Inc. under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Cloudera, Inc. 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 com.cloudera.flume.handlers.debug;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.SourceFactory.SourceBuilder;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventImpl;
import com.cloudera.flume.core.EventSource;
import com.cloudera.util.CharEncUtils;
import com.google.common.base.Preconditions;
/**
* Connects stdin as a source. Each line is a new event entry
*
* Input does not get forwarded properly through the watchdog so it is disabled
* by default when using it
*/
public class StdinSource extends EventSource.Base {
static final Logger LOG = LoggerFactory.getLogger(StdinSource.class);
BufferedReader rd = null;
public StdinSource() {
}
@Override
public void close() throws IOException {
LOG.info("Closing stdin source");
// don't actually close stdin (because we won't be able to open it again)
rd = null;
}
@Override
public Event next() throws IOException {
Preconditions.checkState(rd != null, "Next on unopened sink!");
String s = rd.readLine();
if (s == null) {
return null; // end of stream
}
Event e = new EventImpl(s.getBytes(CharEncUtils.RAW));
updateEventProcessingStats(e);
return e;
}
@Override
public void open() throws IOException {
LOG.info("Opening stdin source");
if (rd != null) {
throw new IllegalStateException("Stdin source was already open");
}
rd = new BufferedReader(new InputStreamReader(System.in));
}
public static SourceBuilder builder() {
return new SourceBuilder() {
@Override
public EventSource build(Context ctx, String... argv) {
return new StdinSource();
}
};
}
}