/*
* 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.block.Block;
import com.facebook.presto.operator.ChannelSet.ChannelSetBuilder;
import com.facebook.presto.tuple.TupleInfo;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import javax.annotation.concurrent.ThreadSafe;
import java.util.List;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
@ThreadSafe
public class SetBuilderOperator
implements Operator
{
public static class SetSupplier
{
private final TupleInfo tupleInfo;
private final SettableFuture<ChannelSet> channelSetFuture = SettableFuture.create();
public SetSupplier(TupleInfo tupleInfo)
{
this.tupleInfo = checkNotNull(tupleInfo, "tupleInfo is null");
}
public TupleInfo getTupleInfo()
{
return tupleInfo;
}
public ListenableFuture<ChannelSet> getChannelSet()
{
return Futures.transform(channelSetFuture, new Function<ChannelSet, ChannelSet>()
{
@Override
public ChannelSet apply(ChannelSet channelSet)
{
return new ChannelSet(channelSet);
}
});
}
void setChannelSet(ChannelSet channelSet)
{
boolean wasSet = channelSetFuture.set(checkNotNull(channelSet, "channelSet is null"));
checkState(wasSet, "ChannelSet already set");
}
}
public static class SetBuilderOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final SetSupplier setProvider;
private final int setChannel;
private final int expectedPositions;
private boolean closed;
public SetBuilderOperatorFactory(
int operatorId,
List<TupleInfo> tupleInfos,
int setChannel,
int expectedPositions)
{
this.operatorId = operatorId;
Preconditions.checkArgument(setChannel >= 0, "setChannel is negative");
this.setProvider = new SetSupplier(checkNotNull(tupleInfos, "tupleInfos is null").get(setChannel));
this.setChannel = setChannel;
this.expectedPositions = checkNotNull(expectedPositions, "expectedPositions is null");
}
public SetSupplier getSetProvider()
{
return setProvider;
}
@Override
public List<TupleInfo> getTupleInfos()
{
return ImmutableList.of();
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, SetBuilderOperator.class.getSimpleName());
return new SetBuilderOperator(operatorContext, setProvider, setChannel, expectedPositions);
}
@Override
public void close()
{
closed = true;
}
}
private final OperatorContext operatorContext;
private final SetSupplier setSupplier;
private final int setChannel;
private final ChannelSetBuilder channelSetBuilder;
private boolean finished;
public SetBuilderOperator(
OperatorContext operatorContext,
SetSupplier setSupplier,
int setChannel,
int expectedPositions)
{
this.operatorContext = checkNotNull(operatorContext, "operatorContext is null");
this.setSupplier = checkNotNull(setSupplier, "setProvider is null");
this.setChannel = setChannel;
this.channelSetBuilder = new ChannelSetBuilder(
setSupplier.getTupleInfo(),
expectedPositions,
checkNotNull(operatorContext, "operatorContext is null"));
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<TupleInfo> getTupleInfos()
{
return ImmutableList.of();
}
@Override
public void finish()
{
if (finished) {
return;
}
ChannelSet channelSet = channelSetBuilder.build();
setSupplier.setChannelSet(channelSet);
operatorContext.recordGeneratedOutput(channelSet.getEstimatedSize(), channelSet.size());
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");
Block sourceBlock = page.getBlock(setChannel);
channelSetBuilder.addBlock(sourceBlock);
}
@Override
public Page getOutput()
{
return null;
}
}