| // 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.ArrayProcessor.deserializeObjectArray; |
| import static com.google.devtools.build.lib.unsafe.UnsafeProvider.getFieldOffset; |
| import static com.google.devtools.build.lib.unsafe.UnsafeProvider.unsafe; |
| |
| import com.google.protobuf.CodedInputStream; |
| import com.google.protobuf.CodedOutputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| |
| /** |
| * Codec for {@link ArrayList}. |
| * |
| * <p>This is needed because {@link ArrayList} marks its {@code elementData} field transient and |
| * even if it weren't, it uses an array slightly larger than its size. |
| */ |
| @SuppressWarnings({"rawtypes", "NonApiType"}) |
| class ArrayListCodec extends AsyncObjectCodec<ArrayList> { |
| private static final long ELEMENT_DATA_OFFSET; |
| private static final long SIZE_OFFSET; |
| |
| @Override |
| public Class<ArrayList> getEncodedClass() { |
| return ArrayList.class; |
| } |
| |
| @Override |
| public void serialize(SerializationContext context, ArrayList list, CodedOutputStream codedOut) |
| throws SerializationException, IOException { |
| codedOut.writeInt32NoTag(list.size()); |
| for (Object item : list) { |
| context.serialize(item, codedOut); |
| } |
| } |
| |
| @Override |
| public ArrayList deserializeAsync(AsyncDeserializationContext context, CodedInputStream codedIn) |
| throws SerializationException, IOException { |
| int length = codedIn.readInt32(); |
| if (length < 0) { |
| throw new SerializationException("Expected non-negative length: " + length); |
| } |
| |
| if (length == 0) { |
| ArrayList empty = new ArrayList(/* initialCapacity= */ 0); |
| context.registerInitialValue(empty); |
| return empty; |
| } |
| |
| ArrayList list; |
| try { |
| list = (ArrayList) unsafe().allocateInstance(ArrayList.class); |
| } catch (InstantiationException e) { |
| throw new SerializationException("could not instantiate ArrayList", e); |
| } |
| context.registerInitialValue(list); |
| |
| // Sets the elementData directly, then reflectively inserts it into the ArrayList. ArrayList's |
| // public API doesn't provide an efficient way to populate elementData by offset. |
| Object[] elementData = new Object[length]; |
| deserializeObjectArray(context, codedIn, elementData, length); |
| |
| unsafe().putObject(list, ELEMENT_DATA_OFFSET, elementData); |
| unsafe().putInt(list, SIZE_OFFSET, length); |
| |
| return list; |
| } |
| |
| static { |
| try { |
| ELEMENT_DATA_OFFSET = getFieldOffset(ArrayList.class, "elementData"); |
| SIZE_OFFSET = getFieldOffset(ArrayList.class, "size"); |
| } catch (NoSuchFieldException e) { |
| throw new ExceptionInInitializerError(e); |
| } |
| } |
| } |