org.apache.flink.runtime.state.ttl.TtlFoldFunction Maven / Gradle / Ivy
/*
* 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.api.common.functions.FoldFunction;
import org.apache.flink.api.common.state.StateTtlConfig;
/**
* This class wraps folding function with TTL logic.
*
* @param Type of the values folded into the state
* @param Type of the value in the state
*
* @deprecated use {@link TtlAggregateFunction} instead
*/
@Deprecated
class TtlFoldFunction
extends AbstractTtlDecorator>
implements FoldFunction> {
private final ACC defaultAccumulator;
TtlFoldFunction(
FoldFunction original, StateTtlConfig config, TtlTimeProvider timeProvider, ACC defaultAccumulator) {
super(original, config, timeProvider);
this.defaultAccumulator = defaultAccumulator;
}
@Override
public TtlValue fold(TtlValue accumulator, T value) throws Exception {
ACC userAcc = getUnexpired(accumulator);
userAcc = userAcc == null ? defaultAccumulator : userAcc;
return wrapWithTs(original.fold(userAcc, value));
}
}