org.apache.flink.runtime.state.ttl.TtlReducingState Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of flink-runtime_2.11 Show documentation

There is a newer version: 1.13.6

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.runtime.state.ttl;

import org.apache.flink.runtime.state.internal.InternalReducingState;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Collection;

/**
 * This class wraps reducing state with TTL logic.
 *
 * @param  The type of key the state is associated to
 * @param  The type of the namespace
 * @param  Type of the user value of state with TTL
 */
class TtlReducingState
	extends AbstractTtlState, InternalReducingState>>
	implements InternalReducingState {
	TtlReducingState(TtlStateContext>, T> tTtlStateContext) {
		super(tTtlStateContext);
	}

	@Override
	public T get() throws Exception {
		accessCallback.run();
		return getInternal();
	}

	@Override
	public void add(T value) throws Exception {
		accessCallback.run();
		original.add(wrapWithTs(value));
	}

	@Nullable
	@Override
	public TtlValue getUnexpiredOrNull(@Nonnull TtlValue ttlValue) {
		return expired(ttlValue) ? null : ttlValue;
	}

	@Override
	public void clear() {
		original.clear();
	}

	@Override
	public void mergeNamespaces(N target, Collection sources) throws Exception {
		original.mergeNamespaces(target, sources);
	}

	@Override
	public T getInternal() throws Exception {
		return getWithTtlCheckAndUpdate(original::getInternal, original::updateInternal);
	}

	@Override
	public void updateInternal(T valueToStore) throws Exception {
		original.updateInternal(wrapWithTs(valueToStore));
	}
}