17dd252788645e940eada959bdde927426e2531c9Paul Duffin/* 27dd252788645e940eada959bdde927426e2531c9Paul Duffin * Copyright (C) 2012 The Guava Authors 37dd252788645e940eada959bdde927426e2531c9Paul Duffin * 47dd252788645e940eada959bdde927426e2531c9Paul Duffin * Licensed under the Apache License, Version 2.0 (the "License"); 57dd252788645e940eada959bdde927426e2531c9Paul Duffin * you may not use this file except in compliance with the License. 67dd252788645e940eada959bdde927426e2531c9Paul Duffin * You may obtain a copy of the License at 77dd252788645e940eada959bdde927426e2531c9Paul Duffin * 87dd252788645e940eada959bdde927426e2531c9Paul Duffin * http://www.apache.org/licenses/LICENSE-2.0 97dd252788645e940eada959bdde927426e2531c9Paul Duffin * 107dd252788645e940eada959bdde927426e2531c9Paul Duffin * Unless required by applicable law or agreed to in writing, software 117dd252788645e940eada959bdde927426e2531c9Paul Duffin * distributed under the License is distributed on an "AS IS" BASIS, 127dd252788645e940eada959bdde927426e2531c9Paul Duffin * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 137dd252788645e940eada959bdde927426e2531c9Paul Duffin * See the License for the specific language governing permissions and 147dd252788645e940eada959bdde927426e2531c9Paul Duffin * limitations under the License. 157dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 167dd252788645e940eada959bdde927426e2531c9Paul Duffin 177dd252788645e940eada959bdde927426e2531c9Paul Duffinpackage com.google.common.cache; 187dd252788645e940eada959bdde927426e2531c9Paul Duffin 197dd252788645e940eada959bdde927426e2531c9Paul Duffinimport com.google.common.annotations.GwtCompatible; 207dd252788645e940eada959bdde927426e2531c9Paul Duffinimport com.google.common.base.Supplier; 217dd252788645e940eada959bdde927426e2531c9Paul Duffin 227dd252788645e940eada959bdde927426e2531c9Paul Duffinimport java.util.concurrent.atomic.AtomicLong; 237dd252788645e940eada959bdde927426e2531c9Paul Duffin 247dd252788645e940eada959bdde927426e2531c9Paul Duffin/** 257dd252788645e940eada959bdde927426e2531c9Paul Duffin * Source of {@link LongAddable} objects that deals with GWT, Unsafe, and all 267dd252788645e940eada959bdde927426e2531c9Paul Duffin * that. 270888a09821a98ac0680fad765217302858e70fa4Paul Duffin * 287dd252788645e940eada959bdde927426e2531c9Paul Duffin * @author Louis Wasserman 297dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 307dd252788645e940eada959bdde927426e2531c9Paul Duffin@GwtCompatible(emulated = true) 317dd252788645e940eada959bdde927426e2531c9Paul Duffinfinal class LongAddables { 327dd252788645e940eada959bdde927426e2531c9Paul Duffin private static final Supplier<LongAddable> SUPPLIER; 330888a09821a98ac0680fad765217302858e70fa4Paul Duffin 347dd252788645e940eada959bdde927426e2531c9Paul Duffin static { 357dd252788645e940eada959bdde927426e2531c9Paul Duffin Supplier<LongAddable> supplier; 367dd252788645e940eada959bdde927426e2531c9Paul Duffin try { 377dd252788645e940eada959bdde927426e2531c9Paul Duffin new LongAdder(); 387dd252788645e940eada959bdde927426e2531c9Paul Duffin supplier = new Supplier<LongAddable>() { 390888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Override 407dd252788645e940eada959bdde927426e2531c9Paul Duffin public LongAddable get() { 417dd252788645e940eada959bdde927426e2531c9Paul Duffin return new LongAdder(); 427dd252788645e940eada959bdde927426e2531c9Paul Duffin } 437dd252788645e940eada959bdde927426e2531c9Paul Duffin }; 447dd252788645e940eada959bdde927426e2531c9Paul Duffin } catch (Throwable t) { // we really want to catch *everything* 457dd252788645e940eada959bdde927426e2531c9Paul Duffin supplier = new Supplier<LongAddable>() { 460888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Override 477dd252788645e940eada959bdde927426e2531c9Paul Duffin public LongAddable get() { 487dd252788645e940eada959bdde927426e2531c9Paul Duffin return new PureJavaLongAddable(); 497dd252788645e940eada959bdde927426e2531c9Paul Duffin } 507dd252788645e940eada959bdde927426e2531c9Paul Duffin }; 517dd252788645e940eada959bdde927426e2531c9Paul Duffin } 527dd252788645e940eada959bdde927426e2531c9Paul Duffin SUPPLIER = supplier; 537dd252788645e940eada959bdde927426e2531c9Paul Duffin } 540888a09821a98ac0680fad765217302858e70fa4Paul Duffin 557dd252788645e940eada959bdde927426e2531c9Paul Duffin public static LongAddable create() { 567dd252788645e940eada959bdde927426e2531c9Paul Duffin return SUPPLIER.get(); 577dd252788645e940eada959bdde927426e2531c9Paul Duffin } 580888a09821a98ac0680fad765217302858e70fa4Paul Duffin 597dd252788645e940eada959bdde927426e2531c9Paul Duffin private static final class PureJavaLongAddable extends AtomicLong implements LongAddable { 600888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Override 617dd252788645e940eada959bdde927426e2531c9Paul Duffin public void increment() { 627dd252788645e940eada959bdde927426e2531c9Paul Duffin getAndIncrement(); 637dd252788645e940eada959bdde927426e2531c9Paul Duffin } 647dd252788645e940eada959bdde927426e2531c9Paul Duffin 650888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Override 667dd252788645e940eada959bdde927426e2531c9Paul Duffin public void add(long x) { 677dd252788645e940eada959bdde927426e2531c9Paul Duffin getAndAdd(x); 687dd252788645e940eada959bdde927426e2531c9Paul Duffin } 697dd252788645e940eada959bdde927426e2531c9Paul Duffin 700888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Override 717dd252788645e940eada959bdde927426e2531c9Paul Duffin public long sum() { 727dd252788645e940eada959bdde927426e2531c9Paul Duffin return get(); 737dd252788645e940eada959bdde927426e2531c9Paul Duffin } 747dd252788645e940eada959bdde927426e2531c9Paul Duffin } 757dd252788645e940eada959bdde927426e2531c9Paul Duffin} 76