11d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2010 The Guava Authors 31d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 41d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 51d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * in compliance with the License. You may obtain a copy of the License at 61d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 71d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * http://www.apache.org/licenses/LICENSE-2.0 81d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 91d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unless required by applicable law or agreed to in writing, software distributed under the License 101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * or implied. See the License for the specific language governing permissions and limitations under 121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * the License. 131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpackage com.google.common.collect; 161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkNotNull; 181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkState; 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.base.Equivalence; 211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.base.Function; 221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.collect.MapMaker.RemovalCause; 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.collect.MapMaker.RemovalListener; 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.io.IOException; 261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.io.ObjectInputStream; 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.io.ObjectOutputStream; 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.lang.ref.ReferenceQueue; 291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.concurrent.ConcurrentMap; 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.concurrent.ExecutionException; 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.concurrent.atomic.AtomicReferenceArray; 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport javax.annotation.Nullable; 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport javax.annotation.concurrent.GuardedBy; 351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/** 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Adds computing functionality to {@link MapMakerInternalMap}. 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author Bob Lee 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author Charles Fry 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertclass ComputingConcurrentHashMap<K, V> extends MapMakerInternalMap<K, V> { 431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final Function<? super K, ? extends V> computingFunction; 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Creates a new, empty map with the specified strategy, initial capacity, load factor and 471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * concurrency level. 481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ComputingConcurrentHashMap(MapMaker builder, 501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Function<? super K, ? extends V> computingFunction) { 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert super(builder); 521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert this.computingFunction = checkNotNull(computingFunction); 531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Segment<K, V> createSegment(int initialCapacity, int maxSegmentSize) { 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return new ComputingSegment<K, V>(this, initialCapacity, maxSegmentSize); 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ComputingSegment<K, V> segmentFor(int hash) { 621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return (ComputingSegment<K, V>) super.segmentFor(hash); 631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V getOrCompute(K key) throws ExecutionException { 661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int hash = hash(checkNotNull(key)); 671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return segmentFor(hash).getOrCompute(key, hash, computingFunction); 681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @SuppressWarnings("serial") // This class is never serialized. 711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert static final class ComputingSegment<K, V> extends Segment<K, V> { 721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ComputingSegment(MapMakerInternalMap<K, V> map, int initialCapacity, int maxSegmentSize) { 731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert super(map, initialCapacity, maxSegmentSize); 741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V getOrCompute(K key, int hash, Function<? super K, ? extends V> computingFunction) 771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert throws ExecutionException { 781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert outer: while (true) { 801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // don't call getLiveEntry, which would ignore computing values 811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ReferenceEntry<K, V> e = getEntry(key, hash); 821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (e != null) { 831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V value = getLiveValue(e); 841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (value != null) { 851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert recordRead(e); 861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return value; 871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // at this point e is either null, computing, or expired; 911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // avoid locking if it's already computing 921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (e == null || !e.getValueReference().isComputingReference()) { 931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert boolean createNewEntry = true; 941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ComputingValueReference<K, V> computingValueReference = null; 951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert lock(); 961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert preWriteCleanup(); 981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int newCount = this.count - 1; 1001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert AtomicReferenceArray<ReferenceEntry<K, V>> table = this.table; 1011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int index = hash & (table.length() - 1); 1021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ReferenceEntry<K, V> first = table.get(index); 1031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (e = first; e != null; e = e.getNext()) { 1051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert K entryKey = e.getKey(); 1061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (e.getHash() == hash && entryKey != null 1071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert && map.keyEquivalence.equivalent(key, entryKey)) { 1081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ValueReference<K, V> valueReference = e.getValueReference(); 1091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (valueReference.isComputingReference()) { 1101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert createNewEntry = false; 1111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else { 1121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V value = e.getValueReference().get(); 1131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (value == null) { 1141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert enqueueNotification(entryKey, hash, value, RemovalCause.COLLECTED); 1151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else if (map.expires() && map.isExpired(e)) { 1161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // This is a duplicate check, as preWriteCleanup already purged expired 1171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // entries, but let's accomodate an incorrect expiration queue. 1181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert enqueueNotification(entryKey, hash, value, RemovalCause.EXPIRED); 1191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else { 1201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert recordLockedRead(e); 1211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return value; 1221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // immediately reuse invalid entries 1251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert evictionQueue.remove(e); 1261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert expirationQueue.remove(e); 1271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert this.count = newCount; // write-volatile 1281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert break; 1301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (createNewEntry) { 1341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert computingValueReference = new ComputingValueReference<K, V>(computingFunction); 1351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (e == null) { 1371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert e = newEntry(key, hash, first); 1381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert e.setValueReference(computingValueReference); 1391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert table.set(index, e); 1401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } else { 1411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert e.setValueReference(computingValueReference); 1421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } finally { 1451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert unlock(); 1461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert postWriteCleanup(); 1471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (createNewEntry) { 1501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // This thread solely created the entry. 1511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return compute(key, hash, e, computingValueReference); 1521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // The entry already exists. Wait for the computation. 1561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkState(!Thread.holdsLock(e), "Recursive computation"); 1571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // don't consider expiration as we're concurrent with computation 1581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V value = e.getValueReference().waitForValue(); 1591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (value != null) { 1601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert recordRead(e); 1611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return value; 1621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // else computing thread will clearValue 1641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert continue outer; 1651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } finally { 1671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert postReadCleanup(); 1681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V compute(K key, int hash, ReferenceEntry<K, V> e, 1721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ComputingValueReference<K, V> computingValueReference) 1731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert throws ExecutionException { 1741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V value = null; 1751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert long start = System.nanoTime(); 1761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert long end = 0; 1771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 1781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // Synchronizes on the entry to allow failing fast when a recursive computation is 1791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // detected. This is not fool-proof since the entry may be copied when the segment 1801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // is written to. 1811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert synchronized (e) { 1821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert value = computingValueReference.compute(key, hash); 1831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert end = System.nanoTime(); 1841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (value != null) { 1861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // putIfAbsent 1871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V oldValue = put(key, hash, value, true); 1881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (oldValue != null) { 1891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // the computed value was already clobbered 1901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert enqueueNotification(key, hash, value, RemovalCause.REPLACED); 1911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return value; 1941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } finally { 1951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (end == 0) { 1961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert end = System.nanoTime(); 1971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (value == null) { 1991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert clearValue(key, hash, computingValueReference); 2001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 2061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Used to provide computation exceptions to other threads. 2071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 2081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static final class ComputationExceptionReference<K, V> implements ValueReference<K, V> { 2091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final Throwable t; 2101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ComputationExceptionReference(Throwable t) { 2121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert this.t = t; 2131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public V get() { 2171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 2181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public ReferenceEntry<K, V> getEntry() { 2221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 2231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public ValueReference<K, V> copyFor(ReferenceQueue<V> queue, ReferenceEntry<K, V> entry) { 2271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return this; 2281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public boolean isComputingReference() { 2321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return false; 2331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public V waitForValue() throws ExecutionException { 2371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert throw new ExecutionException(t); 2381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public void clear(ValueReference<K, V> newValue) {} 2421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 2451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Used to provide computation result to other threads. 2461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 2471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static final class ComputedReference<K, V> implements ValueReference<K, V> { 2481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final V value; 2491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ComputedReference(@Nullable V value) { 2511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert this.value = value; 2521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public V get() { 2561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return value; 2571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public ReferenceEntry<K, V> getEntry() { 2611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 2621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public ValueReference<K, V> copyFor(ReferenceQueue<V> queue, ReferenceEntry<K, V> entry) { 2661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return this; 2671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public boolean isComputingReference() { 2711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return false; 2721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public V waitForValue() { 2761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return get(); 2771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public void clear(ValueReference<K, V> newValue) {} 2811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static final class ComputingValueReference<K, V> implements ValueReference<K, V> { 2841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final Function<? super K, ? extends V> computingFunction; 2851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @GuardedBy("ComputingValueReference.this") // writes 2871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert volatile ValueReference<K, V> computedReference = unset(); 2881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public ComputingValueReference(Function<? super K, ? extends V> computingFunction) { 2901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert this.computingFunction = computingFunction; 2911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 2941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public V get() { 2951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // All computation lookups go through waitForValue. This method thus is 2961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // only used by put, to whom we always want to appear absent. 2971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 2981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 3011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public ReferenceEntry<K, V> getEntry() { 3021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 3031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 3061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public ValueReference<K, V> copyFor(ReferenceQueue<V> queue, ReferenceEntry<K, V> entry) { 3071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return this; 3081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 3111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public boolean isComputingReference() { 3121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return true; 3131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 3161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Waits for a computation to complete. Returns the result of the computation. 3171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 3181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 3191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public V waitForValue() throws ExecutionException { 3201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (computedReference == UNSET) { 3211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert boolean interrupted = false; 3221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 3231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert synchronized (this) { 3241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert while (computedReference == UNSET) { 3251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 3261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert wait(); 3271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } catch (InterruptedException ie) { 3281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert interrupted = true; 3291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } finally { 3331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (interrupted) { 3341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Thread.currentThread().interrupt(); 3351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return computedReference.waitForValue(); 3391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 3421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public void clear(ValueReference<K, V> newValue) { 3431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // The pending computation was clobbered by a manual write. Unblock all 3441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // pending gets, and have them return the new value. 3451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert setValueReference(newValue); 3461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(fry): could also cancel computation if we had a thread handle 3481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V compute(K key, int hash) throws ExecutionException { 3511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert V value; 3521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert try { 3531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert value = computingFunction.apply(key); 3541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } catch (Throwable t) { 3551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert setValueReference(new ComputationExceptionReference<K, V>(t)); 3561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert throw new ExecutionException(t); 3571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert setValueReference(new ComputedReference<K, V>(value)); 3601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return value; 3611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert void setValueReference(ValueReference<K, V> valueReference) { 3641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert synchronized (this) { 3651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (computedReference == UNSET) { 3661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert computedReference = valueReference; 3671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert notifyAll(); 3681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // Serialization Support 3741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static final long serialVersionUID = 4; 3761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 3781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Object writeReplace() { 3791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return new ComputingSerializationProxy<K, V>(keyStrength, valueStrength, keyEquivalence, 3801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert valueEquivalence, expireAfterWriteNanos, expireAfterAccessNanos, maximumSize, 3811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert concurrencyLevel, removalListener, this, computingFunction); 3821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert static final class ComputingSerializationProxy<K, V> extends AbstractSerializationProxy<K, V> { 3851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert final Function<? super K, ? extends V> computingFunction; 3871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ComputingSerializationProxy(Strength keyStrength, Strength valueStrength, 3891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Equivalence<Object> keyEquivalence, Equivalence<Object> valueEquivalence, 3901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert long expireAfterWriteNanos, long expireAfterAccessNanos, int maximumSize, 3911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int concurrencyLevel, RemovalListener<? super K, ? super V> removalListener, 3921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert ConcurrentMap<K, V> delegate, Function<? super K, ? extends V> computingFunction) { 3931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert super(keyStrength, valueStrength, keyEquivalence, valueEquivalence, expireAfterWriteNanos, 3941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert expireAfterAccessNanos, maximumSize, concurrencyLevel, removalListener, delegate); 3951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert this.computingFunction = computingFunction; 3961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private void writeObject(ObjectOutputStream out) throws IOException { 3991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert out.defaultWriteObject(); 4001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert writeMapTo(out); 4011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 4021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 4031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @SuppressWarnings("deprecation") // self-use 4041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { 4051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert in.defaultReadObject(); 4061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert MapMaker mapMaker = readMapMaker(in); 4071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert delegate = mapMaker.makeComputingMap(computingFunction); 4081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert readEntries(in); 4091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 4101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 4111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert Object readResolve() { 4121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return delegate; 4131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 4141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 4151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static final long serialVersionUID = 4; 4161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 4171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert} 418