org.apache.flink.runtime.state.ttl.TtlReduceFunction 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.ReduceFunction;
import org.apache.flink.api.common.state.StateTtlConfig;
/**
* This class wraps reducing function with TTL logic.
*
* @param Type of the user value of state with TTL
*/
class TtlReduceFunction
extends AbstractTtlDecorator>
implements ReduceFunction> {
TtlReduceFunction(
ReduceFunction originalReduceFunction,
StateTtlConfig config,
TtlTimeProvider timeProvider) {
super(originalReduceFunction, config, timeProvider);
}
@Override
public TtlValue reduce(TtlValue value1, TtlValue value2) throws Exception {
T userValue1 = getUnexpired(value1);
T userValue2 = getUnexpired(value2);
if (userValue1 != null && userValue2 != null) {
return wrapWithTs(original.reduce(userValue1, userValue2));
} else if (userValue1 != null) {
return rewrapWithNewTs(value1);
} else if (userValue2 != null) {
return rewrapWithNewTs(value2);
} else {
return null;
}
}
}