/*
* 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 com.facebook.presto.operator;
import com.facebook.presto.memory.LocalMemoryContext;
import com.facebook.presto.operator.project.PageProcessor;
import com.facebook.presto.operator.project.PageProcessorOutput;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.planner.plan.PlanNodeId;
import com.google.common.collect.ImmutableList;
import java.util.List;
import java.util.function.Supplier;
import static com.facebook.presto.operator.project.PageProcessorOutput.EMPTY_PAGE_PROCESSOR_OUTPUT;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
public class FilterAndProjectOperator
implements Operator
{
private final OperatorContext operatorContext;
private final List<Type> types;
private final LocalMemoryContext outputMemoryContext;
private final PageProcessor processor;
private PageProcessorOutput currentOutput = EMPTY_PAGE_PROCESSOR_OUTPUT;
private boolean finishing;
public FilterAndProjectOperator(OperatorContext operatorContext, Iterable<? extends Type> types, PageProcessor processor)
{
this.processor = requireNonNull(processor, "processor is null");
this.operatorContext = requireNonNull(operatorContext, "operatorContext is null");
this.outputMemoryContext = operatorContext.getSystemMemoryContext().newLocalMemoryContext();
this.types = ImmutableList.copyOf(requireNonNull(types, "types is null"));
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public final List<Type> getTypes()
{
return types;
}
@Override
public final void finish()
{
finishing = true;
}
@Override
public final boolean isFinished()
{
boolean finished = finishing && !currentOutput.hasNext();
if (finished) {
currentOutput = EMPTY_PAGE_PROCESSOR_OUTPUT;
outputMemoryContext.setBytes(0);
}
return finished;
}
@Override
public final boolean needsInput()
{
return !finishing && !currentOutput.hasNext();
}
@Override
public final void addInput(Page page)
{
checkState(!finishing, "Operator is already finishing");
requireNonNull(page, "page is null");
checkState(!currentOutput.hasNext(), "Page buffer is full");
currentOutput = processor.process(operatorContext.getSession().toConnectorSession(), page);
outputMemoryContext.setBytes(currentOutput.getRetainedSizeInBytes());
}
@Override
public final Page getOutput()
{
if (!currentOutput.hasNext()) {
return null;
}
return currentOutput.next();
}
public static class FilterAndProjectOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final PlanNodeId planNodeId;
private final Supplier<PageProcessor> processor;
private final List<Type> types;
private boolean closed;
public FilterAndProjectOperatorFactory(int operatorId, PlanNodeId planNodeId, Supplier<PageProcessor> processor, List<Type> types)
{
this.operatorId = operatorId;
this.planNodeId = requireNonNull(planNodeId, "planNodeId is null");
this.processor = requireNonNull(processor, "processor is null");
this.types = ImmutableList.copyOf(requireNonNull(types, "types is null"));
}
@Override
public List<Type> getTypes()
{
return types;
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, FilterAndProjectOperator.class.getSimpleName());
return new FilterAndProjectOperator(operatorContext, types, processor.get());
}
@Override
public void close()
{
closed = true;
}
@Override
public OperatorFactory duplicate()
{
return new FilterAndProjectOperatorFactory(operatorId, planNodeId, processor, types);
}
}
}