io.trino.operator.exchange.RandomExchanger 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.exchange;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;
import io.trino.spi.Page;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
import java.util.function.Consumer;
import static java.util.Objects.requireNonNull;
class RandomExchanger
implements LocalExchanger
{
private final List> buffers;
private final LocalExchangeMemoryManager memoryManager;
public RandomExchanger(List> buffers, LocalExchangeMemoryManager memoryManager)
{
this.buffers = ImmutableList.copyOf(requireNonNull(buffers, "buffers is null"));
this.memoryManager = requireNonNull(memoryManager, "memoryManager is null");
}
@Override
public void accept(Page page)
{
memoryManager.updateMemoryUsage(page.getRetainedSizeInBytes());
int randomIndex = ThreadLocalRandom.current().nextInt(buffers.size());
buffers.get(randomIndex).accept(page);
}
@Override
public ListenableFuture waitForWriting()
{
return memoryManager.getNotFullFuture();
}
}