/*
* 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.index;
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.operator.Page;
import com.facebook.presto.operator.PagesIndex;
import com.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;
import javax.annotation.concurrent.ThreadSafe;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
@ThreadSafe
public class PagesIndexBuilderOperator
implements Operator
{
public static class PagesIndexBuilderOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final List<Type> types;
private final AtomicReference<PagesIndex> pagesIndexReference = new AtomicReference<>();
private boolean closed;
public PagesIndexBuilderOperatorFactory(
int operatorId,
List<Type> types)
{
this.operatorId = operatorId;
this.types = checkNotNull(types, "types is null");
}
public void setPagesIndex(PagesIndex pagesIndex)
{
checkNotNull(pagesIndex, "pagesIndex is null");
checkState(pagesIndexReference.compareAndSet(null, pagesIndex), "Pages index has already been set");
}
@Override
public List<Type> getTypes()
{
return types;
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
PagesIndex pagesIndex = pagesIndexReference.get();
checkState(pagesIndex != null, "Pages index has not been set");
OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, PagesIndexBuilderOperator.class.getSimpleName());
return new PagesIndexBuilderOperator(
types,
operatorContext,
pagesIndex);
}
@Override
public void close()
{
closed = true;
}
}
private final List<Type> types;
private final OperatorContext operatorContext;
private final PagesIndex pagesIndex;
private boolean finished;
public PagesIndexBuilderOperator(
List<Type> types,
OperatorContext operatorContext,
PagesIndex pagesIndex)
{
this.types = ImmutableList.copyOf(checkNotNull(types, "types is null"));
this.operatorContext = checkNotNull(operatorContext, "operatorContext is null");
this.pagesIndex = checkNotNull(pagesIndex, "pagesIndex is null");
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<Type> getTypes()
{
return types;
}
@Override
public void finish()
{
finished = true;
}
@Override
public boolean isFinished()
{
return finished;
}
@Override
public ListenableFuture<?> isBlocked()
{
return NOT_BLOCKED;
}
@Override
public boolean needsInput()
{
return !finished;
}
@Override
public void addInput(Page page)
{
checkNotNull(page, "page is null");
checkState(!isFinished(), "Operator is already finished");
pagesIndex.addPage(page);
operatorContext.recordGeneratedOutput(page.getDataSize(), page.getPositionCount());
}
@Override
public Page getOutput()
{
return null;
}
}