/*
* 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.block.Block;
import com.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.Collection;
import java.util.List;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
public class TableCommitOperator
implements Operator
{
public static final List<Type> TYPES = ImmutableList.<Type>of(BIGINT);
public static class TableCommitOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final TableCommitter tableCommitter;
private boolean closed;
public TableCommitOperatorFactory(int operatorId, TableCommitter tableCommitter)
{
this.operatorId = operatorId;
this.tableCommitter = checkNotNull(tableCommitter, "tableCommitter is null");
}
@Override
public List<Type> getTypes()
{
return TYPES;
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext context = driverContext.addOperatorContext(operatorId, TableCommitOperator.class.getSimpleName());
return new TableCommitOperator(context, tableCommitter);
}
@Override
public void close()
{
closed = true;
}
}
private enum State
{
RUNNING, FINISHING, FINISHED
}
private final OperatorContext operatorContext;
private final TableCommitter tableCommitter;
private State state = State.RUNNING;
private long rowCount;
private final ImmutableList.Builder<String> fragmentBuilder = ImmutableList.builder();
public TableCommitOperator(OperatorContext operatorContext, TableCommitter tableCommitter)
{
this.operatorContext = checkNotNull(operatorContext, "operatorContext is null");
this.tableCommitter = checkNotNull(tableCommitter, "tableCommitter is null");
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<Type> getTypes()
{
return TYPES;
}
@Override
public void finish()
{
if (state == State.RUNNING) {
state = State.FINISHING;
}
}
@Override
public boolean isFinished()
{
return state == State.FINISHED;
}
@Override
public ListenableFuture<?> isBlocked()
{
return NOT_BLOCKED;
}
@Override
public boolean needsInput()
{
return state == State.RUNNING;
}
@Override
public void addInput(Page page)
{
checkNotNull(page, "page is null");
checkState(state == State.RUNNING, "Operator is %s", state);
Block rowCountBlock = page.getBlock(0);
Block fragmentBlock = page.getBlock(1);
for (int position = 0; position < page.getPositionCount(); position++) {
rowCount += rowCountBlock.getLong(position);
fragmentBuilder.add(fragmentBlock.getSlice(position).toStringUtf8());
}
}
@Override
public Page getOutput()
{
if (state != State.FINISHING) {
return null;
}
state = State.FINISHED;
tableCommitter.commitTable(fragmentBuilder.build());
PageBuilder page = new PageBuilder(getTypes());
page.getBlockBuilder(0).appendLong(rowCount);
return page.build();
}
public interface TableCommitter
{
void commitTable(Collection<String> fragments);
}
}