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A high performance caching library
There is a newer version: 3.1.8
// Copyright 2021 Ben Manes. All Rights Reserved.
//
// 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 com.github.benmanes.caffeine.cache;

import com.github.benmanes.caffeine.cache.References.SoftValueReference;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;

/**
 * WARNING: GENERATED CODE
 *
 * A cache entry that provides the following features:
 *
 * 

 *   StrongKeys
 *   
SoftValues
 * 
 *
 * @author [email protected] (Ben Manes)
 */
@SuppressWarnings({"unchecked", "PMD.UnusedFormalParameter", "MissingOverride", "NullAway"})
class PD extends Node implements NodeFactory {
  protected static final VarHandle VALUE;

  static {
    MethodHandles.Lookup lookup = MethodHandles.lookup();
    try {
      VALUE = lookup.findVarHandle(PD.class, NodeFactory.VALUE, SoftValueReference.class);
    } catch (ReflectiveOperationException e) {
      throw new ExceptionInInitializerError(e);
    }
  }

  volatile SoftValueReference value;

  PD() {}

  PD(
      K key,
      ReferenceQueue keyReferenceQueue,
      V value,
      ReferenceQueue valueReferenceQueue,
      int weight,
      long now) {
    this(key, value, valueReferenceQueue, weight, now);
  }

  PD(Object keyReference, V value, ReferenceQueue valueReferenceQueue, int weight, long now) {
    VALUE.set(this, new SoftValueReference(keyReference, value, valueReferenceQueue));
  }

  public final Object getKeyReference() {
    SoftValueReference valueRef = (SoftValueReference) VALUE.get(this);
    return valueRef.getKeyReference();
  }

  public final K getKey() {
    SoftValueReference valueRef = (SoftValueReference) VALUE.get(this);
    return (K) valueRef.getKeyReference();
  }

  public final V getValue() {
    for (; ; ) {
      Reference ref = (Reference) VALUE.get(this);
      V referent = ref.get();
      if ((referent != null) || (ref == VALUE.getAcquire(this))) {
        return referent;
      }
    }
  }

  public final Object getValueReference() {
    return VALUE.get(this);
  }

  public final void setValue(V value, ReferenceQueue referenceQueue) {
    Reference ref = (Reference) VALUE.get(this);
    VALUE.setRelease(this, new SoftValueReference(getKeyReference(), value, referenceQueue));
    ref.clear();
  }

  public final boolean containsValue(Object value) {
    return getValue() == value;
  }

  public Node newNode(
      K key,
      ReferenceQueue keyReferenceQueue,
      V value,
      ReferenceQueue valueReferenceQueue,
      int weight,
      long now) {
    return new PD<>(key, keyReferenceQueue, value, valueReferenceQueue, weight, now);
  }

  public Node newNode(
      Object keyReference, V value, ReferenceQueue valueReferenceQueue, int weight, long now) {
    return new PD<>(keyReference, value, valueReferenceQueue, weight, now);
  }

  public boolean softValues() {
    return true;
  }

  public final boolean isAlive() {
    Object key = getKeyReference();
    return (key != RETIRED_STRONG_KEY) && (key != DEAD_STRONG_KEY);
  }

  public final boolean isRetired() {
    return (getKeyReference() == RETIRED_STRONG_KEY);
  }

  public final void retire() {
    SoftValueReference valueRef = (SoftValueReference) VALUE.get(this);
    valueRef.setKeyReference(RETIRED_STRONG_KEY);
    valueRef.clear();
  }

  public final boolean isDead() {
    return (getKeyReference() == DEAD_STRONG_KEY);
  }

  public final void die() {
    SoftValueReference valueRef = (SoftValueReference) VALUE.get(this);
    valueRef.setKeyReference(DEAD_STRONG_KEY);
    valueRef.clear();
  }
}