/*
* Copyright © 2015 Cask Data, Inc.
*
* Licensed 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 co.cask.cdap.internal.app.runtime.batch.dataset;
import co.cask.cdap.api.data.batch.BatchWritable;
import co.cask.cdap.api.data.batch.DatasetOutputCommitter;
import co.cask.cdap.api.data.batch.OutputFormatProvider;
import co.cask.cdap.api.dataset.DataSetException;
import co.cask.cdap.api.dataset.Dataset;
import co.cask.cdap.common.conf.ConfigurationUtil;
import org.apache.hadoop.conf.Configuration;
import java.util.Map;
/**
* A {@link OutputFormatProvider} that provides information for batch job to write to {@link Dataset}.
*/
public class DatasetOutputFormatProvider implements OutputFormatProvider, DatasetOutputCommitter {
private final String outputFormatClassName;
private final Map<String, String> configuration;
private final Dataset dataset;
public DatasetOutputFormatProvider(String datasetName, Map<String, String> datasetArgs, Dataset dataset,
Class<? extends AbstractBatchWritableOutputFormat> batchWritableOutputFormat) {
if (dataset instanceof OutputFormatProvider) {
this.outputFormatClassName = ((OutputFormatProvider) dataset).getOutputFormatClassName();
this.configuration = ((OutputFormatProvider) dataset).getOutputFormatConfiguration();
} else if (dataset instanceof BatchWritable) {
this.outputFormatClassName = batchWritableOutputFormat.getName();
this.configuration = createDatasetConfiguration(datasetName, datasetArgs);
} else {
throw new IllegalArgumentException("Dataset '" + dataset +
"' is neither OutputFormatProvider nor BatchWritable.");
}
this.dataset = dataset;
}
@Override
public String getOutputFormatClassName() {
return outputFormatClassName;
}
@Override
public Map<String, String> getOutputFormatConfiguration() {
return configuration;
}
private Map<String, String> createDatasetConfiguration(String datasetName, Map<String, String> datasetArgs) {
Configuration hConf = new Configuration();
hConf.clear();
AbstractBatchWritableOutputFormat.setDataset(hConf, datasetName, datasetArgs);
return ConfigurationUtil.toMap(hConf);
}
@Override
public void onSuccess() throws DataSetException {
if (dataset instanceof DatasetOutputCommitter) {
((DatasetOutputCommitter) dataset).onSuccess();
}
}
@Override
public void onFailure() throws DataSetException {
if (dataset instanceof DatasetOutputCommitter) {
((DatasetOutputCommitter) dataset).onFailure();
}
}
}