| // Copyright 2018 The Bazel Authors. 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.google.devtools.build.lib.skyframe.serialization; |
| |
| import static com.google.devtools.build.lib.skyframe.serialization.ClassCodec.classCodec; |
| import static com.google.devtools.build.lib.unsafe.UnsafeProvider.unsafe; |
| import static sun.misc.Unsafe.ARRAY_OBJECT_BASE_OFFSET; |
| import static sun.misc.Unsafe.ARRAY_OBJECT_INDEX_SCALE; |
| |
| import com.google.protobuf.CodedInputStream; |
| import com.google.protobuf.CodedOutputStream; |
| import java.io.IOException; |
| import java.util.EnumMap; |
| import java.util.Map; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * Serialize {@link EnumMap}. Subclasses of {@link EnumMap} will crash at runtime because currently |
| * there are no "benign" subclasses of {@link EnumMap} in the Bazel codebase that can be used where |
| * an {@link EnumMap} was expected. |
| */ |
| @SuppressWarnings({"rawtypes", "unchecked"}) |
| class EnumMapCodec extends AsyncObjectCodec<EnumMap> { |
| /** Used to retrieve the hidden {@link EnumMap#keyType} field. */ |
| private static final long KEY_TYPE_OFFSET; |
| |
| static { |
| try { |
| KEY_TYPE_OFFSET = unsafe().objectFieldOffset(EnumMap.class.getDeclaredField("keyType")); |
| } catch (NoSuchFieldException e) { |
| throw new ExceptionInInitializerError(e); |
| } |
| } |
| |
| @Override |
| public Class<EnumMap> getEncodedClass() { |
| return EnumMap.class; |
| } |
| |
| @Override |
| public void serialize(SerializationContext context, EnumMap obj, CodedOutputStream codedOut) |
| throws SerializationException, IOException { |
| if (!obj.getClass().equals(EnumMap.class)) { |
| throw new SerializationException( |
| "Cannot serialize subclasses of EnumMap: " + obj.getClass() + " (" + obj + ")"); |
| } |
| classCodec() |
| .serialize(context, ((Class<?>) unsafe().getObject(obj, KEY_TYPE_OFFSET)), codedOut); |
| |
| codedOut.writeInt32NoTag(obj.size()); |
| if (obj.isEmpty()) { |
| return; |
| } |
| |
| for (Object next : obj.entrySet()) { |
| Map.Entry entry = (Map.Entry) next; |
| codedOut.writeInt32NoTag(((Enum) entry.getKey()).ordinal()); |
| context.serialize(entry.getValue(), codedOut); |
| } |
| } |
| |
| @Override |
| public EnumMap deserializeAsync(AsyncDeserializationContext context, CodedInputStream codedIn) |
| throws SerializationException, IOException { |
| Class clazz = classCodec().deserialize(context, codedIn); |
| int size = codedIn.readInt32(); |
| EnumMap result = new EnumMap(clazz); |
| context.registerInitialValue(result); |
| |
| MapBuffer buffer = new MapBuffer(result, size); |
| |
| Object[] enums = clazz.getEnumConstants(); |
| for (int i = 0; i < size; i++) { |
| int ordinal = codedIn.readInt32(); |
| buffer.setEnum(i, enums[ordinal]); |
| context.deserialize( |
| codedIn, |
| buffer.values, |
| ARRAY_OBJECT_BASE_OFFSET + ARRAY_OBJECT_INDEX_SCALE * i, |
| /* done= */ (Runnable) buffer); |
| } |
| return result; |
| } |
| |
| /** Buffers the entry elements and populates the map once all values are done. */ |
| private static class MapBuffer implements Runnable { |
| private final EnumMap result; |
| private final Object[] enums; |
| private final Object[] values; |
| |
| private final AtomicInteger remaining; |
| |
| private MapBuffer(EnumMap result, int size) { |
| this.result = result; |
| this.enums = new Object[size]; |
| this.values = new Object[size]; |
| this.remaining = new AtomicInteger(size); |
| } |
| |
| @Override |
| public void run() { |
| if (remaining.decrementAndGet() == 0) { |
| for (int i = 0; i < enums.length; i++) { |
| result.put(enums[i], values[i]); |
| } |
| } |
| } |
| |
| private void setEnum(int index, Object enumKey) { |
| enums[index] = enumKey; |
| } |
| } |
| } |