/*
* 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.instrumented.converter;
import java.io.IOException;
import gobblin.configuration.State;
import gobblin.configuration.WorkUnitState;
import gobblin.converter.Converter;
import gobblin.converter.DataConversionException;
import gobblin.converter.SchemaConversionException;
import gobblin.instrumented.Instrumented;
import gobblin.metrics.MetricContext;
import gobblin.util.Decorator;
import gobblin.util.DecoratorUtils;
/**
* Decorator that automatically instruments {@link gobblin.converter.Converter}.
* Handles already instrumented {@link gobblin.instrumented.converter.InstrumentedConverter}
* appropriately to avoid double metric reporting.
*/
public class InstrumentedConverterDecorator<SI, SO, DI, DO> extends InstrumentedConverterBase<SI, SO, DI, DO>
implements Decorator {
private Converter<SI, SO, DI, DO> embeddedConverter;
private final boolean isEmbeddedInstrumented;
public InstrumentedConverterDecorator(Converter<SI, SO, DI, DO> converter) {
this.embeddedConverter = converter;
this.isEmbeddedInstrumented = Instrumented.isLineageInstrumented(converter);
}
@Override
public Converter<SI, SO, DI, DO> init(WorkUnitState workUnit) {
this.embeddedConverter = this.embeddedConverter.init(workUnit);
return super.init(workUnit, DecoratorUtils.resolveUnderlyingObject(this).getClass());
}
@Override
public MetricContext getMetricContext() {
return this.isEmbeddedInstrumented
? ((InstrumentedConverterBase<SI, SO, DI, DO>) this.embeddedConverter).getMetricContext()
: super.getMetricContext();
}
@Override
public Iterable<DO> convertRecord(SO outputSchema, DI inputRecord, WorkUnitState workUnit)
throws DataConversionException {
return this.isEmbeddedInstrumented ? convertRecordImpl(outputSchema, inputRecord, workUnit)
: super.convertRecord(outputSchema, inputRecord, workUnit);
}
@Override
public Iterable<DO> convertRecordImpl(SO outputSchema, DI inputRecord, WorkUnitState workUnit)
throws DataConversionException {
return this.embeddedConverter.convertRecord(outputSchema, inputRecord, workUnit);
}
@Override
public SO convertSchema(SI inputSchema, WorkUnitState workUnit) throws SchemaConversionException {
return this.embeddedConverter.convertSchema(inputSchema, workUnit);
}
@Override
public void close() throws IOException {
this.embeddedConverter.close();
}
@Override
public State getFinalState() {
return this.embeddedConverter.getFinalState();
}
@Override
public Object getDecoratedObject() {
return this.embeddedConverter;
}
}