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/*
 * 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 javax.annotation.Nullable;

import java.io.Serializable;

import static org.apache.flink.util.Preconditions.checkArgument;

/**
 * This class wraps user value of state with TTL. Visibility is public for usage with external
 * tools.
 *
 * @param  Type of the user value of state with TTL
 */
public class TtlValue implements Serializable {
    private static final long serialVersionUID = 5221129704201125020L;

    @Nullable private final T userValue;
    private final long lastAccessTimestamp;

    public TtlValue(@Nullable T userValue, long lastAccessTimestamp) {
        checkArgument(!(userValue instanceof TtlValue));
        this.userValue = userValue;
        this.lastAccessTimestamp = lastAccessTimestamp;
    }

    @Nullable
    public T getUserValue() {
        return userValue;
    }

    public long getLastAccessTimestamp() {
        return lastAccessTimestamp;
    }
}