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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.kv.state;

import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;

/**
 * Base class that manages common flags for {@link ValueState} and {@link MapState}.
 */
public abstract class StateBase implements BackingStore {

  private static final int TRANSIENT = 0x1;
  private static final AtomicIntegerFieldUpdater FLAGS = AtomicIntegerFieldUpdater.newUpdater(StateBase.class, "flags");
  private volatile int flags = 0;

  @Override
  public boolean isTransient() {
    return (FLAGS.get(this) & TRANSIENT) != 0;
  }

  @Override
  public void setIsTransient(boolean flag) {
    final var mask = flag ? TRANSIENT : ~TRANSIENT;
    FLAGS.accumulateAndGet(this, mask, (f, m) -> f | m);
  }

}