/**
* 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 helloworld;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.Pair;
import com.google.common.base.Preconditions;
/**
* Simple Source that generates a "hello world!" event every 3 seconds.
*/
public class HelloWorldSource extends EventSource.Base {
static final Logger LOG = LoggerFactory.getLogger(HelloWorldSource.class);
private String helloWorld;
@Override
public void open() throws IOException {
// Initialized the source
helloWorld = "Hello World!";
}
@Override
public Event next() throws IOException {
// Next returns the next event, blocking if none available.
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
throw new IOException(e.getMessage(), e);
}
return new EventImpl(helloWorld.getBytes());
}
@Override
public void close() throws IOException {
// Cleanup
helloWorld = null;
}
public static SourceBuilder builder() {
// construct a new parameterized source
return new SourceBuilder() {
@Override
public EventSource build(String... argv) {
Preconditions.checkArgument(argv.length == 0,
"usage: helloWorldSource");
return new HelloWorldSource();
}
};
}
/**
* This is a special function used by the SourceFactory to pull in this class
* as a plugin source.
*/
public static List<Pair<String, SourceBuilder>> getSourceBuilders() {
List<Pair<String, SourceBuilder>> builders =
new ArrayList<Pair<String, SourceBuilder>>();
builders.add(new Pair<String, SourceBuilder>("helloWorldSource", builder()));
return builders;
}
}