/*
* 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.spi.Page;
import com.facebook.presto.spi.PageBuilder;
import com.facebook.presto.spi.UpdatablePageSource;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.planner.plan.PlanNodeId;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;
import io.airlift.slice.Slice;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.function.Supplier;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.VarbinaryType.VARBINARY;
import static com.google.common.base.Preconditions.checkState;
import static io.airlift.concurrent.MoreFutures.getFutureValue;
import static io.airlift.concurrent.MoreFutures.toListenableFuture;
import static java.util.Objects.requireNonNull;
public class DeleteOperator
implements Operator
{
public static final List<Type> TYPES = ImmutableList.of(BIGINT, VARBINARY);
public static class DeleteOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final PlanNodeId planNodeId;
private final int rowIdChannel;
private boolean closed;
public DeleteOperatorFactory(int operatorId, PlanNodeId planNodeId, int rowIdChannel)
{
this.operatorId = operatorId;
this.planNodeId = requireNonNull(planNodeId, "planNodeId is null");
this.rowIdChannel = rowIdChannel;
}
@Override
public List<Type> getTypes()
{
return TYPES;
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext context = driverContext.addOperatorContext(operatorId, planNodeId, DeleteOperator.class.getSimpleName());
return new DeleteOperator(context, rowIdChannel);
}
@Override
public void close()
{
closed = true;
}
@Override
public OperatorFactory duplicate()
{
return new DeleteOperatorFactory(operatorId, planNodeId, rowIdChannel);
}
}
private enum State
{
RUNNING, FINISHING, FINISHED
}
private final OperatorContext operatorContext;
private final int rowIdChannel;
private State state = State.RUNNING;
private long rowCount;
private boolean closed;
private ListenableFuture<Collection<Slice>> finishFuture;
private Supplier<Optional<UpdatablePageSource>> pageSource = Optional::empty;
public DeleteOperator(OperatorContext operatorContext, int rowIdChannel)
{
this.operatorContext = requireNonNull(operatorContext, "operatorContext is null");
this.rowIdChannel = rowIdChannel;
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<Type> getTypes()
{
return TYPES;
}
@Override
public void finish()
{
if (state == State.RUNNING) {
state = State.FINISHING;
finishFuture = toListenableFuture(pageSource().finish());
}
}
@Override
public boolean isFinished()
{
return state == State.FINISHED;
}
@Override
public boolean needsInput()
{
return state == State.RUNNING;
}
@Override
public void addInput(Page page)
{
requireNonNull(page, "page is null");
checkState(state == State.RUNNING, "Operator is %s", state);
Block rowIds = page.getBlock(rowIdChannel);
pageSource().deleteRows(rowIds);
rowCount += rowIds.getPositionCount();
}
@Override
public ListenableFuture<?> isBlocked()
{
if (finishFuture == null) {
return NOT_BLOCKED;
}
return finishFuture;
}
@Override
public Page getOutput()
{
if ((state != State.FINISHING) || !finishFuture.isDone()) {
return null;
}
state = State.FINISHED;
Collection<Slice> fragments = getFutureValue(finishFuture);
PageBuilder page = new PageBuilder(TYPES);
BlockBuilder rowsBuilder = page.getBlockBuilder(0);
BlockBuilder fragmentBuilder = page.getBlockBuilder(1);
// write row count
page.declarePosition();
BIGINT.writeLong(rowsBuilder, rowCount);
fragmentBuilder.appendNull();
// write fragments
for (Slice fragment : fragments) {
page.declarePosition();
rowsBuilder.appendNull();
VARBINARY.writeSlice(fragmentBuilder, fragment);
}
return page.build();
}
@Override
public void close()
throws Exception
{
if (!closed) {
closed = true;
if (finishFuture != null) {
finishFuture.cancel(true);
}
else {
pageSource.get().ifPresent(UpdatablePageSource::abort);
}
}
}
public void setPageSource(Supplier<Optional<UpdatablePageSource>> pageSource)
{
this.pageSource = requireNonNull(pageSource, "pageSource is null");
}
private UpdatablePageSource pageSource()
{
Optional<UpdatablePageSource> source = pageSource.get();
checkState(source.isPresent(), "UpdatablePageSource not set");
return source.get();
}
}