/*
* 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 gobblin.util.test;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
import gobblin.configuration.SourceState;
import gobblin.configuration.WorkUnitState;
import gobblin.source.Source;
import gobblin.source.extractor.Extractor;
import gobblin.source.workunit.Extract;
import gobblin.source.workunit.Extract.TableType;
import gobblin.source.workunit.WorkUnit;
import gobblin.util.ConfigUtils;
/**
* Hello world!
*/
public class HelloWorldSource implements Source<String, String> {
public static final String CONFIG_NAMESPACE = "gobblin.source.helloWorld";
public static final String NUM_HELLOS_KEY = "numHellos";
public static final String NUM_HELLOS_FULL_KEY = CONFIG_NAMESPACE + "." + NUM_HELLOS_KEY;
public static final int DEFAULT_NUM_HELLOS = 1;
public static final String HELLO_ID_KEY = "helloId";
public static final String HELLO_ID_FULL_KEY = CONFIG_NAMESPACE +"." + HELLO_ID_KEY;
@Override
public List<WorkUnit> getWorkunits(SourceState state) {
Config rootCfg = ConfigUtils.propertiesToConfig(state.getProperties());
Config cfg = rootCfg.hasPath(CONFIG_NAMESPACE) ? rootCfg.getConfig(CONFIG_NAMESPACE) :
ConfigFactory.empty();
int numHellos = cfg.hasPath(NUM_HELLOS_KEY) ? cfg.getInt(NUM_HELLOS_KEY) : DEFAULT_NUM_HELLOS;
Extract extract = new Extract(TableType.APPEND_ONLY,
HelloWorldSource.class.getPackage().getName(),
HelloWorldSource.class.getSimpleName());
List<WorkUnit> wus = new ArrayList<>(numHellos);
for (int i = 1; i <= numHellos; ++i) {
WorkUnit wu = new WorkUnit(extract);
wu.setProp(HELLO_ID_FULL_KEY, i);
wus.add(wu);
}
return wus;
}
@Override
public Extractor<String, String> getExtractor(WorkUnitState state) {
int helloId = state.getPropAsInt(HELLO_ID_FULL_KEY);
return new ExtractorImpl(helloId);
}
@Override
public void shutdown(SourceState state) {
// Nothing to do
}
public static class ExtractorImpl implements Extractor<String, String> {
private final int _helloId;
private int _recordsEmitted = 0;
public ExtractorImpl(int helloId) {
_helloId = helloId;
}
@Override public void close() throws IOException {
// Nothing to do
}
@Override public String getSchema() throws IOException {
return "string";
}
@Override public String readRecord(String reuse) {
if (_recordsEmitted > 0) {
return null;
}
++_recordsEmitted;
return helloMessage(_helloId);
}
public static String helloMessage(int helloId) {
return "Hello world " + helloId + " !";
}
@Override public long getExpectedRecordCount() {
return 1;
}
@Override public long getHighWatermark() {
return 0;
}
}
}