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/*
* ===============================LICENSE_START======================================
* dcae-analytics
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============================LICENSE_END===========================================
*/
package org.openecomp.dcae.apod.analytics.cdap.plugins.batch.sink.dmaap;
import co.cask.cdap.api.annotation.Description;
import co.cask.cdap.api.annotation.Name;
import co.cask.cdap.api.annotation.Plugin;
import co.cask.cdap.api.data.batch.Output;
import co.cask.cdap.api.data.format.StructuredRecord;
import co.cask.cdap.api.data.schema.Schema;
import co.cask.cdap.api.dataset.lib.KeyValue;
import co.cask.cdap.etl.api.Emitter;
import co.cask.cdap.etl.api.PipelineConfigurer;
import co.cask.cdap.etl.api.batch.BatchSink;
import co.cask.cdap.etl.api.batch.BatchSinkContext;
import org.apache.hadoop.io.NullWritable;
import org.openecomp.dcae.apod.analytics.cdap.common.utils.ValidationUtils;
import org.openecomp.dcae.apod.analytics.cdap.plugins.domain.config.dmaap.DMaaPMRSinkPluginConfig;
import org.openecomp.dcae.apod.analytics.cdap.plugins.utils.CDAPPluginUtils;
import org.openecomp.dcae.apod.analytics.cdap.plugins.validator.DMaaPMRSinkPluginConfigValidator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author Rajiv Singla . Creation Date: 1/26/2017.
*/
@Plugin(type = BatchSink.PLUGIN_TYPE)
@Name("DMaaPMRSink")
@Description("A batch sink Plugin that publishes messages to DMaaP MR Topic.")
public class DMaaPMRSink extends BatchSink<StructuredRecord, String, NullWritable> {
private static final Logger LOG = LoggerFactory.getLogger(DMaaPMRSink.class);
private final DMaaPMRSinkPluginConfig pluginConfig;
public DMaaPMRSink(final DMaaPMRSinkPluginConfig pluginConfig) {
LOG.debug("Creating DMaaP MR Sink Plugin with plugin Config: {}", pluginConfig);
this.pluginConfig = pluginConfig;
}
@Override
public void configurePipeline(final PipelineConfigurer pipelineConfigurer) {
super.configurePipeline(pipelineConfigurer);
ValidationUtils.validateSettings(pluginConfig, new DMaaPMRSinkPluginConfigValidator());
// validates that input schema contains the field provided in Sink Message Column Name property
final Schema inputSchema = pipelineConfigurer.getStageConfigurer().getInputSchema();
CDAPPluginUtils.validateSchemaContainsFields(inputSchema, pluginConfig.getMessageColumnName());
}
@Override
public void prepareRun(BatchSinkContext context) throws Exception {
context.addOutput(Output.of(pluginConfig.getReferenceName(), new DMaaPMROutputFormatProvider(pluginConfig)));
}
@Override
public void transform(StructuredRecord structuredRecord,
Emitter<KeyValue<String, NullWritable>> emitter) throws Exception {
// get incoming message from structured record
final String incomingMessage = structuredRecord.get(pluginConfig.getMessageColumnName());
// if incoming messages does not have message column name log warning as it should not happen
if (incomingMessage == null) {
LOG.warn("Column Name: {}, contains no message.Skipped for DMaaP MR Publishing....",
pluginConfig.getMessageColumnName());
} else {
// emit the messages as key
emitter.emit(new KeyValue<String, NullWritable>(incomingMessage, null));
}
}
}
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