/*
* 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.fork;
import java.util.List;
import com.google.common.base.Optional;
import gobblin.configuration.WorkUnitState;
import gobblin.fork.ForkOperator;
import gobblin.instrumented.Instrumented;
import gobblin.metrics.MetricContext;
import gobblin.util.Decorator;
import gobblin.util.DecoratorUtils;
/**
* Decorator that automatically instruments {@link gobblin.fork.ForkOperator}.
* Handles already instrumented {@link gobblin.instrumented.fork.InstrumentedForkOperator}
* appropriately to avoid double metric reporting.
*/
public class InstrumentedForkOperatorDecorator<S, D> extends InstrumentedForkOperatorBase<S, D> implements Decorator {
private ForkOperator<S, D> embeddedForkOperator;
private boolean isEmbeddedInstrumented;
public InstrumentedForkOperatorDecorator(ForkOperator<S, D> forkOperator) {
super(Optional.<Class<?>> of(DecoratorUtils.resolveUnderlyingObject(forkOperator).getClass()));
this.embeddedForkOperator = this.closer.register(forkOperator);
this.isEmbeddedInstrumented = Instrumented.isLineageInstrumented(forkOperator);
}
@Override
public void init(WorkUnitState workUnitState) throws Exception {
this.embeddedForkOperator.init(workUnitState);
super.init(workUnitState, DecoratorUtils.resolveUnderlyingObject(this).getClass());
}
@Override
public MetricContext getMetricContext() {
return this.isEmbeddedInstrumented
? ((InstrumentedForkOperatorBase<S, D>) this.embeddedForkOperator).getMetricContext()
: super.getMetricContext();
}
@Override
public List<Boolean> forkDataRecord(WorkUnitState workUnitState, D input) {
return this.isEmbeddedInstrumented ? forkDataRecordImpl(workUnitState, input)
: super.forkDataRecord(workUnitState, input);
}
@Override
public List<Boolean> forkDataRecordImpl(WorkUnitState workUnitState, D input) {
return this.embeddedForkOperator.forkDataRecord(workUnitState, input);
}
@Override
public int getBranches(WorkUnitState workUnitState) {
return this.embeddedForkOperator.getBranches(workUnitState);
}
@Override
public List<Boolean> forkSchema(WorkUnitState workUnitState, S input) {
return this.embeddedForkOperator.forkSchema(workUnitState, input);
}
@Override
public Object getDecoratedObject() {
return this.embeddedForkOperator;
}
}