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Add BasicWorkProcessorOperatorAdapter
BasicWorkProcessorOperatorAdapter removes input page buffering responsibility from work processor operators.
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presto-main/src/main/java/io/prestosql/operator/BasicWorkProcessorOperatorAdapter.java
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| /* | ||
| * 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 io.prestosql.operator; | ||
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| import io.prestosql.execution.Lifespan; | ||
| import io.prestosql.operator.WorkProcessorOperatorAdapter.AdapterWorkProcessorOperator; | ||
| import io.prestosql.operator.WorkProcessorOperatorAdapter.AdapterWorkProcessorOperatorFactory; | ||
| import io.prestosql.spi.Page; | ||
| import io.prestosql.sql.planner.plan.PlanNodeId; | ||
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| import java.util.Optional; | ||
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| import static java.util.Objects.requireNonNull; | ||
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| /** | ||
| * This {@link WorkProcessorOperator} adapter allows to adapt {@link WorkProcessor} operators | ||
| * that do not require special input handling (e.g streaming operators). | ||
| */ | ||
| public class BasicWorkProcessorOperatorAdapter | ||
| implements AdapterWorkProcessorOperator | ||
| { | ||
| public interface BasicAdapterWorkProcessorOperatorFactory | ||
| extends WorkProcessorOperatorFactory | ||
| { | ||
| default WorkProcessorOperator createAdapterOperator(ProcessorContext processorContext, WorkProcessor<Page> sourcePages) | ||
| { | ||
| return create(processorContext, sourcePages); | ||
| } | ||
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| BasicAdapterWorkProcessorOperatorFactory duplicate(); | ||
| } | ||
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| public static OperatorFactory createAdapterOperatorFactory(BasicAdapterWorkProcessorOperatorFactory operatorFactory) | ||
| { | ||
| return WorkProcessorOperatorAdapter.createAdapterOperatorFactory(new Factory(operatorFactory)); | ||
| } | ||
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| private static class Factory | ||
| implements AdapterWorkProcessorOperatorFactory | ||
| { | ||
| private final BasicAdapterWorkProcessorOperatorFactory operatorFactory; | ||
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| Factory(BasicAdapterWorkProcessorOperatorFactory operatorFactory) | ||
| { | ||
| this.operatorFactory = requireNonNull(operatorFactory, "operatorFactory is null"); | ||
| } | ||
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| @Override | ||
| public AdapterWorkProcessorOperatorFactory duplicate() | ||
| { | ||
| return new Factory(operatorFactory.duplicate()); | ||
| } | ||
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| @Override | ||
| public int getOperatorId() | ||
| { | ||
| return operatorFactory.getOperatorId(); | ||
| } | ||
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| @Override | ||
| public PlanNodeId getPlanNodeId() | ||
| { | ||
| return operatorFactory.getPlanNodeId(); | ||
| } | ||
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| @Override | ||
| public String getOperatorType() | ||
| { | ||
| return operatorFactory.getOperatorType(); | ||
| } | ||
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| @Override | ||
| public WorkProcessorOperator create(ProcessorContext processorContext, WorkProcessor<Page> sourcePages) | ||
| { | ||
| return operatorFactory.create(processorContext, sourcePages); | ||
| } | ||
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| @Override | ||
| public AdapterWorkProcessorOperator createAdapterOperator(ProcessorContext processorContext) | ||
| { | ||
| return new BasicWorkProcessorOperatorAdapter(processorContext, operatorFactory); | ||
| } | ||
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| @Override | ||
| public void lifespanFinished(Lifespan lifespan) | ||
| { | ||
| operatorFactory.lifespanFinished(lifespan); | ||
| } | ||
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| @Override | ||
| public void close() | ||
| { | ||
| operatorFactory.close(); | ||
| } | ||
| } | ||
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| private final PageBuffer pageBuffer; | ||
| private final WorkProcessorOperator operator; | ||
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| private BasicWorkProcessorOperatorAdapter( | ||
| ProcessorContext processorContext, | ||
| BasicAdapterWorkProcessorOperatorFactory operatorFactory) | ||
| { | ||
| this.pageBuffer = new PageBuffer(); | ||
| this.operator = requireNonNull(operatorFactory, "operator is null").createAdapterOperator(processorContext, pageBuffer.pages()); | ||
| } | ||
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| @Override | ||
| public void finish() | ||
| { | ||
| pageBuffer.finish(); | ||
| } | ||
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| @Override | ||
| public boolean needsInput() | ||
| { | ||
| return pageBuffer.isEmpty() && !pageBuffer.isFinished(); | ||
| } | ||
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| @Override | ||
| public void addInput(Page page) | ||
| { | ||
| pageBuffer.add(page); | ||
| } | ||
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| @Override | ||
| public WorkProcessor<Page> getOutputPages() | ||
| { | ||
| return operator.getOutputPages(); | ||
| } | ||
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| @Override | ||
| public Optional<OperatorInfo> getOperatorInfo() | ||
| { | ||
| return operator.getOperatorInfo(); | ||
| } | ||
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| @Override | ||
| public void close() | ||
| throws Exception | ||
| { | ||
| operator.close(); | ||
| } | ||
| } |
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