/*
* 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.exchange;
import com.facebook.presto.operator.DriverContext;
import com.facebook.presto.operator.Operator;
import com.facebook.presto.operator.OperatorContext;
import com.facebook.presto.operator.OperatorFactory;
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.util.concurrent.ListenableFuture;
import java.util.List;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
public class LocalExchangeSourceOperator
implements Operator
{
public static class LocalExchangeSourceOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final PlanNodeId planNodeId;
private final LocalExchange inMemoryExchange;
private int bufferIndex;
private boolean closed;
public LocalExchangeSourceOperatorFactory(int operatorId, PlanNodeId planNodeId, LocalExchange inMemoryExchange)
{
this.operatorId = operatorId;
this.planNodeId = requireNonNull(planNodeId, "planNodeId is null");
this.inMemoryExchange = requireNonNull(inMemoryExchange, "inMemoryExchange is null");
}
@Override
public List<Type> getTypes()
{
return inMemoryExchange.getTypes();
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
checkState(bufferIndex < inMemoryExchange.getBufferCount(), "All operators already created");
OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, LocalExchangeSourceOperator.class.getSimpleName());
Operator operator = new LocalExchangeSourceOperator(operatorContext, inMemoryExchange.getSource(bufferIndex));
bufferIndex++;
return operator;
}
@Override
public void close()
{
closed = true;
}
@Override
public OperatorFactory duplicate()
{
throw new UnsupportedOperationException("Source operator factories can not be duplicated");
}
}
private final OperatorContext operatorContext;
private final LocalExchangeSource source;
public LocalExchangeSourceOperator(OperatorContext operatorContext, LocalExchangeSource source)
{
this.operatorContext = requireNonNull(operatorContext, "operatorContext is null");
this.source = requireNonNull(source, "source is null");
operatorContext.setInfoSupplier(source::getBufferInfo);
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<Type> getTypes()
{
return source.getTypes();
}
@Override
public void finish()
{
source.finish();
}
@Override
public boolean isFinished()
{
return source.isFinished();
}
@Override
public ListenableFuture<?> isBlocked()
{
return source.waitForReading();
}
@Override
public boolean needsInput()
{
return false;
}
@Override
public void addInput(Page page)
{
throw new UnsupportedOperationException();
}
@Override
public Page getOutput()
{
Page page = source.removePage();
if (page != null) {
operatorContext.recordGeneratedInput(page.getSizeInBytes(), page.getPositionCount());
}
return page;
}
@Override
public void close()
{
source.close();
}
}