/*
 * Copyright (C) 2012 The Guava Authors
 *
 * 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.google.common.cache;

import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Supplier;

import java.util.concurrent.atomic.AtomicLong;

/**
 * Source of {@link LongAddable} objects that deals with GWT, Unsafe, and all
 * that.
 * 
 * @author Louis Wasserman
 */
@GwtCompatible(emulated = true)
final class LongAddables {
  private static final Supplier<LongAddable> SUPPLIER;
  
  static {
    Supplier<LongAddable> supplier;
    try {
      new LongAdder();
      supplier = new Supplier<LongAddable>() {
        @Override
        public LongAddable get() {
          return new LongAdder();
        }
      };
    } catch (Throwable t) { // we really want to catch *everything*
      supplier = new Supplier<LongAddable>() {
        @Override
        public LongAddable get() {
          return new PureJavaLongAddable();
        }
      };
    }
    SUPPLIER = supplier;
  }
  
  public static LongAddable create() {
    return SUPPLIER.get();
  }
  
  private static final class PureJavaLongAddable extends AtomicLong implements LongAddable {
    @Override
    public void increment() {
      getAndIncrement();
    }

    @Override
    public void add(long x) {
      getAndAdd(x);
    }

    @Override
    public long sum() {
      return get();
    }
  }
}