/*
* 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.memory.LocalMemoryContext;
import com.facebook.presto.metadata.Split;
import com.facebook.presto.operator.project.PageProcessor;
import com.facebook.presto.operator.project.PageProcessorOutput;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ConnectorPageSource;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.PageBuilder;
import com.facebook.presto.spi.RecordCursor;
import com.facebook.presto.spi.RecordPageSource;
import com.facebook.presto.spi.UpdatablePageSource;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.split.EmptySplit;
import com.facebook.presto.split.EmptySplitPageSource;
import com.facebook.presto.split.PageSourceProvider;
import com.facebook.presto.sql.planner.plan.PlanNodeId;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import java.io.Closeable;
import java.io.IOException;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.function.Supplier;
import static com.facebook.presto.operator.project.PageProcessorOutput.EMPTY_PAGE_PROCESSOR_OUTPUT;
import static com.google.common.base.Preconditions.checkState;
import static io.airlift.concurrent.MoreFutures.toListenableFuture;
import static java.util.Objects.requireNonNull;
public class ScanFilterAndProjectOperator
implements SourceOperator, Closeable
{
private static final int ROWS_PER_PAGE = 16384;
private final OperatorContext operatorContext;
private final PlanNodeId planNodeId;
private final PageSourceProvider pageSourceProvider;
private final List<Type> types;
private final List<ColumnHandle> columns;
private final PageBuilder pageBuilder;
private final CursorProcessor cursorProcessor;
private final PageProcessor pageProcessor;
private final LocalMemoryContext pageSourceMemoryContext;
private final LocalMemoryContext pageBuilderMemoryContext;
private final SettableFuture<?> blocked = SettableFuture.create();
private RecordCursor cursor;
private ConnectorPageSource pageSource;
private Split split;
private PageProcessorOutput currentOutput = EMPTY_PAGE_PROCESSOR_OUTPUT;
private boolean finishing;
private long completedBytes;
private long readTimeNanos;
protected ScanFilterAndProjectOperator(
OperatorContext operatorContext,
PlanNodeId sourceId,
PageSourceProvider pageSourceProvider,
CursorProcessor cursorProcessor,
PageProcessor pageProcessor,
Iterable<ColumnHandle> columns,
Iterable<Type> types)
{
this.cursorProcessor = requireNonNull(cursorProcessor, "cursorProcessor is null");
this.pageProcessor = requireNonNull(pageProcessor, "pageProcessor is null");
this.operatorContext = requireNonNull(operatorContext, "operatorContext is null");
this.planNodeId = requireNonNull(sourceId, "sourceId is null");
this.pageSourceProvider = requireNonNull(pageSourceProvider, "pageSourceProvider is null");
this.types = ImmutableList.copyOf(requireNonNull(types, "types is null"));
this.columns = ImmutableList.copyOf(requireNonNull(columns, "columns is null"));
this.pageSourceMemoryContext = operatorContext.getSystemMemoryContext().newLocalMemoryContext();
this.pageBuilderMemoryContext = operatorContext.getSystemMemoryContext().newLocalMemoryContext();
this.pageBuilder = new PageBuilder(getTypes());
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public PlanNodeId getSourceId()
{
return planNodeId;
}
@Override
public Supplier<Optional<UpdatablePageSource>> addSplit(Split split)
{
requireNonNull(split, "split is null");
checkState(this.split == null, "Table scan split already set");
if (finishing) {
return Optional::empty;
}
this.split = split;
Object splitInfo = split.getInfo();
if (splitInfo != null) {
operatorContext.setInfoSupplier(() -> new SplitOperatorInfo(splitInfo));
}
blocked.set(null);
if (split.getConnectorSplit() instanceof EmptySplit) {
pageSource = new EmptySplitPageSource();
}
return () -> {
if (pageSource instanceof UpdatablePageSource) {
return Optional.of((UpdatablePageSource) pageSource);
}
return Optional.empty();
};
}
@Override
public void noMoreSplits()
{
if (split == null) {
finishing = true;
}
blocked.set(null);
}
@Override
public final List<Type> getTypes()
{
return types;
}
@Override
public void close()
{
finish();
}
@Override
public void finish()
{
blocked.set(null);
if (pageSource != null) {
try {
pageSource.close();
}
catch (IOException e) {
throw Throwables.propagate(e);
}
}
else if (cursor != null) {
cursor.close();
}
finishing = true;
}
@Override
public final boolean isFinished()
{
return finishing && pageBuilder.isEmpty() && !currentOutput.hasNext();
}
@Override
public ListenableFuture<?> isBlocked()
{
if (!blocked.isDone()) {
return blocked;
}
if (pageSource != null) {
CompletableFuture<?> pageSourceBlocked = pageSource.isBlocked();
return pageSourceBlocked.isDone() ? NOT_BLOCKED : toListenableFuture(pageSourceBlocked);
}
return NOT_BLOCKED;
}
@Override
public final boolean needsInput()
{
return false;
}
@Override
public final void addInput(Page page)
{
throw new UnsupportedOperationException();
}
@Override
public Page getOutput()
{
if (split == null) {
return null;
}
if (!finishing && pageSource == null && cursor == null) {
ConnectorPageSource source = pageSourceProvider.createPageSource(operatorContext.getSession(), split, columns);
if (source instanceof RecordPageSource) {
cursor = ((RecordPageSource) source).getCursor();
}
else {
pageSource = source;
}
}
if (pageSource != null) {
return processPageSource();
}
else {
return processColumnSource();
}
}
private Page processColumnSource()
{
if (!finishing) {
int rowsProcessed = cursorProcessor.process(operatorContext.getSession().toConnectorSession(), cursor, ROWS_PER_PAGE, pageBuilder);
pageSourceMemoryContext.setBytes(cursor.getSystemMemoryUsage());
long bytesProcessed = cursor.getCompletedBytes() - completedBytes;
long elapsedNanos = cursor.getReadTimeNanos() - readTimeNanos;
operatorContext.recordGeneratedInput(bytesProcessed, rowsProcessed, elapsedNanos);
completedBytes = cursor.getCompletedBytes();
readTimeNanos = cursor.getReadTimeNanos();
if (rowsProcessed == 0) {
finishing = true;
}
}
// only return a page if buffer is full or we are finishing
Page page = null;
if (!pageBuilder.isEmpty() && (finishing || pageBuilder.isFull())) {
page = pageBuilder.build();
pageBuilder.reset();
}
pageBuilderMemoryContext.setBytes(pageBuilder.getRetainedSizeInBytes());
return page;
}
private Page processPageSource()
{
if (!finishing && !currentOutput.hasNext()) {
Page page = pageSource.getNextPage();
finishing = pageSource.isFinished();
pageSourceMemoryContext.setBytes(pageSource.getSystemMemoryUsage());
if (page == null) {
currentOutput = EMPTY_PAGE_PROCESSOR_OUTPUT;
}
else {
// update operator stats
long endCompletedBytes = pageSource.getCompletedBytes();
long endReadTimeNanos = pageSource.getReadTimeNanos();
operatorContext.recordGeneratedInput(endCompletedBytes - completedBytes, page.getPositionCount(), endReadTimeNanos - readTimeNanos);
completedBytes = endCompletedBytes;
readTimeNanos = endReadTimeNanos;
currentOutput = pageProcessor.process(operatorContext.getSession().toConnectorSession(), page);
}
pageBuilderMemoryContext.setBytes(currentOutput.getRetainedSizeInBytes());
}
return currentOutput.hasNext() ? currentOutput.next() : null;
}
public static class ScanFilterAndProjectOperatorFactory
implements SourceOperatorFactory
{
private final int operatorId;
private final PlanNodeId planNodeId;
private final Supplier<CursorProcessor> cursorProcessor;
private final Supplier<PageProcessor> pageProcessor;
private final PlanNodeId sourceId;
private final PageSourceProvider pageSourceProvider;
private final List<ColumnHandle> columns;
private final List<Type> types;
private boolean closed;
public ScanFilterAndProjectOperatorFactory(
int operatorId,
PlanNodeId planNodeId,
PlanNodeId sourceId,
PageSourceProvider pageSourceProvider,
Supplier<CursorProcessor> cursorProcessor,
Supplier<PageProcessor> pageProcessor,
Iterable<ColumnHandle> columns,
List<Type> types)
{
this.operatorId = operatorId;
this.planNodeId = requireNonNull(planNodeId, "planNodeId is null");
this.cursorProcessor = requireNonNull(cursorProcessor, "cursorProcessor is null");
this.pageProcessor = requireNonNull(pageProcessor, "pageProcessor is null");
this.sourceId = requireNonNull(sourceId, "sourceId is null");
this.pageSourceProvider = requireNonNull(pageSourceProvider, "pageSourceProvider is null");
this.columns = ImmutableList.copyOf(requireNonNull(columns, "columns is null"));
this.types = requireNonNull(types, "types is null");
}
@Override
public PlanNodeId getSourceId()
{
return sourceId;
}
@Override
public List<Type> getTypes()
{
return types;
}
@Override
public SourceOperator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, ScanFilterAndProjectOperator.class.getSimpleName());
return new ScanFilterAndProjectOperator(
operatorContext,
sourceId,
pageSourceProvider,
cursorProcessor.get(),
pageProcessor.get(),
columns,
types);
}
@Override
public void close()
{
closed = true;
}
}
}