co.cask.cdap.internal.app.runtime.batch.dataset.DatasetOutputFormatProvider.java Source code

Introduction

Here is the source code for co.cask.cdap.internal.app.runtime.batch.dataset.DatasetOutputFormatProvider.java

Source

/*
 * 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();
        }
    }
}