io.trino.operator.join.NestedLoopJoinPagesSupplier Maven / Gradle / Ivy
/*
* 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 io.trino.operator.join;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.util.concurrent.Futures.transformAsync;
import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
import static java.util.Objects.requireNonNull;
public final class NestedLoopJoinPagesSupplier
implements NestedLoopJoinBridge
{
private final SettableFuture pagesFuture = SettableFuture.create();
private final SettableFuture pagesNoLongerNeeded = SettableFuture.create();
@Override
public ListenableFuture getPagesFuture()
{
return transformAsync(pagesFuture, Futures::immediateFuture, directExecutor());
}
@Override
public ListenableFuture setPages(NestedLoopJoinPages nestedLoopJoinPages)
{
requireNonNull(nestedLoopJoinPages, "nestedLoopJoinPages is null");
boolean wasSet = pagesFuture.set(nestedLoopJoinPages);
checkState(wasSet, "pagesFuture already set");
return pagesNoLongerNeeded;
}
@Override
public void destroy()
{
// Let the NestedLoopBuildOperator declare that it's finished.
pagesNoLongerNeeded.set(null);
}
}