Examples with Emitter co.cask.cdap.etl.api.Emitter used on opensource projects

Example 1 with Emitter

use of co.cask.cdap.etl.api.Emitter in project cdap by caskdata.

the class ETLWorker method initializeSinks.

@SuppressWarnings("unchecked")
private void initializeSinks(WorkerContext context, Map<String, TransformDetail> transformationMap, PipelinePhase pipeline) throws Exception {
    Set<StageInfo> sinkInfos = pipeline.getStagesOfType(RealtimeSink.PLUGIN_TYPE);
    sinks = new HashMap<>(sinkInfos.size());
    for (StageInfo sinkInfo : sinkInfos) {
        String sinkName = sinkInfo.getName();
        RealtimeSink sink = context.newPluginInstance(sinkName);
        sink = new LoggedRealtimeSink(sinkName, sink);
        WorkerRealtimeContext sinkContext = new WorkerRealtimeContext(context, metrics, new TxLookupProvider(context), sinkInfo);
        LOG.debug("Sink Class : {}", sink.getClass().getName());
        sink.initialize(sinkContext);
        sink = new TrackedRealtimeSink(sink, new DefaultStageMetrics(metrics, sinkName));
        Transformation identityTransformation = new Transformation() {

            @Override
            public void transform(Object input, Emitter emitter) throws Exception {
                emitter.emit(input);
            }
        };
        // we use identity transformation to simplify executing transformation in pipeline (similar to ETLMapreduce),
        // since we want to emit metrics during write to sink and not during this transformation, we use NoOpMetrics.
        TrackedTransform trackedTransform = new TrackedTransform(identityTransformation, new DefaultStageMetrics(metrics, sinkName), TrackedTransform.RECORDS_IN, null, context.getDataTracer(sinkName));
        transformationMap.put(sinkInfo.getName(), new TransformDetail(trackedTransform, new HashSet<String>()));
        sinks.put(sinkInfo.getName(), sink);
    }
}