com.facebook.presto.nodettlfetchers.infinite.InfiniteNodeTtlFetcher 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 com.facebook.presto.nodettlfetchers.infinite;
import com.facebook.presto.spi.ttl.NodeInfo;
import com.facebook.presto.spi.ttl.NodeTtl;
import com.facebook.presto.spi.ttl.NodeTtlFetcher;
import com.google.common.collect.ImmutableSet;
import java.util.Map;
import java.util.Set;
import static com.facebook.presto.spi.ttl.ConfidenceBasedTtlInfo.getInfiniteTtl;
import static com.google.common.collect.ImmutableMap.toImmutableMap;
import static java.util.Objects.requireNonNull;
import static java.util.function.Function.identity;
public class InfiniteNodeTtlFetcher
implements NodeTtlFetcher
{
@Override
public Map getTtlInfo(Set nodes)
{
requireNonNull(nodes, "nodes is null");
return nodes.stream().collect(toImmutableMap(identity(), node -> new NodeTtl(ImmutableSet.of(getInfiniteTtl()))));
}
@Override
public boolean needsPeriodicRefresh()
{
return false;
}
}