/*
 * Copyright Terracotta, 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 org.ehcache.impl.internal.store.heap.holders;

import org.ehcache.sizeof.annotations.IgnoreSizeOf;
import org.ehcache.core.spi.store.Store;
import org.ehcache.spi.copy.Copier;

import java.util.concurrent.TimeUnit;

Author:
Albin Suresh/**
 * @author Albin Suresh
 */
public class CopiedOnHeapValueHolder<V> extends OnHeapValueHolder<V> {
  private final V copiedValue;
  @IgnoreSizeOf
  private final Copier<V> valueCopier;

  protected CopiedOnHeapValueHolder(long id, V value, long creationTime, long expirationTime, boolean evictionAdvice, Copier<V> valueCopier) {
    super(id, creationTime, expirationTime, evictionAdvice);
    if (value == null) {
      throw new NullPointerException("null value");
    }
    if (valueCopier == null) {
      throw new NullPointerException("null copier");
    }
    this.valueCopier = valueCopier;
    this.copiedValue = valueCopier.copyForWrite(value);
  }

  
Constructor to build this value holder from another value holder.
As such we assume that the passed in value is internal and so has been copied for write already elsewhere.
Params:
valueHolder – reference value holder
value – the value
valueCopier – the copier to use for copyForRead
now – timestamp in millis
expiration – computed expiration duration/**
   * Constructor to build this value holder from another value holder.
   * As such we assume that the passed in value is internal and so has been copied for write already elsewhere.
   *
   * @param valueHolder reference value holder
   * @param value the value
   * @param valueCopier the copier to use for copyForRead
   * @param now timestamp in millis
   * @param expiration computed expiration duration
   */
  public CopiedOnHeapValueHolder(Store.ValueHolder<V> valueHolder, V value, boolean evictionAdvice, Copier<V> valueCopier, long now, java.time.Duration expiration) {
    super(valueHolder.getId(), valueHolder.creationTime(), valueHolder.expirationTime(), evictionAdvice);
    if (value == null) {
      throw new NullPointerException("null value");
    }
    if (valueCopier == null) {
      throw new NullPointerException("null copier");
    }
    this.valueCopier = valueCopier;
    this.copiedValue = value;
    this.accessed(now, expiration);
  }

  public CopiedOnHeapValueHolder(V value, long creationTime, boolean evictionAdvice, Copier<V> valueCopier) {
    this(value, creationTime, NO_EXPIRE, evictionAdvice, valueCopier);
  }

  public CopiedOnHeapValueHolder(V value, long creationTime, long expirationTime, boolean evictionAdvice, Copier<V> valueCopier) {
    this(-1, value, creationTime, expirationTime, evictionAdvice, valueCopier);
  }

  @Override
  public V get() {
    return valueCopier.copyForRead(copiedValue);
  }
}