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API for web agent persistence support

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// Copyright 2015-2024 Nstream, inc.
//
// 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 nstream.persist.api.cache;

import swim.structure.Value;

/**
 * Interface for stores that provide persistence for value lanes.
 */
public interface ValueBackingStore extends BackingStore {

  /**
   * @return The current value of the state.
   */
  Value get();

  /**
   * Set a new value into the state.
   *
   * @param newValue The value to set.
   * @return The previous value of the state.
   */
  Value set(Value newValue);

}