/*
* 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.spiller;
import com.facebook.presto.spi.Page;
import com.google.common.util.concurrent.ListenableFuture;
import java.io.Closeable;
import java.util.Iterator;
import static com.google.common.collect.Iterators.singletonIterator;
public interface SingleStreamSpiller
extends Closeable
{
/**
* Initiate spilling of pages stream. Returns completed future once spilling has finished.
* Next spill can be initiated as soon as previous one completes.
*/
ListenableFuture<?> spill(Iterator<Page> page);
/**
* Initiate spilling of single page. Returns completed future once spilling has finished.
* Next spill can be initiated as soon as previous one completes.
*/
default ListenableFuture<?> spill(Page page)
{
return spill(singletonIterator(page));
}
/**
* Returns list of previously spilled Pages as a single stream. Pages are in the same order
* as they were spilled. Method requires the issued spill request to be completed.
*/
Iterator<Page> getSpilledPages();
/**
* Close releases/removes all underlying resources used during spilling
* like for example all created temporary files.
*/
@Override
void close();
}