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Enables dependency injection for PUBLIC_FIELD and POLYMORPHIC AutoCod…
…ec strategies. PiperOrigin-RevId: 180954849
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src/main/java/com/google/devtools/build/lib/skyframe/serialization/PolymorphicHelper.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,97 @@ | ||
| // 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. | ||
|
|
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| package com.google.devtools.build.lib.skyframe.serialization; | ||
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| import com.google.devtools.build.lib.skyframe.serialization.strings.StringCodecs; | ||
| import com.google.protobuf.CodedInputStream; | ||
| import com.google.protobuf.CodedOutputStream; | ||
| import java.io.IOException; | ||
| import java.lang.reflect.Field; | ||
| import java.util.Optional; | ||
| import javax.annotation.Nullable; | ||
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| /** Helper methods for polymorphic codecs using reflection. */ | ||
| public class PolymorphicHelper { | ||
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| private PolymorphicHelper() {} | ||
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| @SuppressWarnings("unchecked") | ||
| public static void serialize(Object input, CodedOutputStream codedOut) | ||
| throws IOException, SerializationException { | ||
| if (input != null) { | ||
| Class<?> clazz = input.getClass(); | ||
| try { | ||
| Object codec = getCodec(clazz); | ||
| codedOut.writeBoolNoTag(true); | ||
| StringCodecs.asciiOptimized().serialize(clazz.getName(), codedOut); | ||
| if (codec instanceof ObjectCodec) { | ||
| ((ObjectCodec) codec).serialize(input, codedOut); | ||
| } else if (codec instanceof InjectingObjectCodec) { | ||
| ((InjectingObjectCodec) codec).serialize(input, codedOut); | ||
| } else { | ||
| throw new SerializationException( | ||
| clazz.getCanonicalName() | ||
| + ".CODEC has unexpected type " | ||
| + codec.getClass().getCanonicalName()); | ||
| } | ||
| } catch (ReflectiveOperationException e) { | ||
| throw new SerializationException(input.getClass().getName(), e); | ||
| } | ||
| } else { | ||
| codedOut.writeBoolNoTag(false); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Deserializes a polymorphic type. | ||
| * | ||
| * @param dependency if null, it means that the parent, polymorphic type, provides no dependency. | ||
| * It is valid for dependency to be non-null, with an enclosed null value. | ||
| */ | ||
| @SuppressWarnings("unchecked") | ||
| public static Object deserialize(CodedInputStream codedIn, @Nullable Optional<?> dependency) | ||
| throws IOException, SerializationException { | ||
| Object deserialized = null; | ||
| if (codedIn.readBool()) { | ||
| String className = StringCodecs.asciiOptimized().deserialize(codedIn); | ||
| try { | ||
| Object codec = getCodec(Class.forName(className)); | ||
| if (codec instanceof ObjectCodec) { | ||
| return ((ObjectCodec) codec).deserialize(codedIn); | ||
| } else if (codec instanceof InjectingObjectCodec) { | ||
| if (dependency == null) { | ||
| throw new SerializationException( | ||
| className + " deserialize parent class lacks required dependency."); | ||
| } | ||
| return ((InjectingObjectCodec) codec).deserialize(dependency.orElse(null), codedIn); | ||
| } else { | ||
| throw new SerializationException( | ||
| className + ".CODEC has unexpected type " + codec.getClass().getCanonicalName()); | ||
| } | ||
| } catch (ReflectiveOperationException e) { | ||
| throw new SerializationException(className, e); | ||
| } | ||
| } | ||
| return deserialized; | ||
| } | ||
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| /** Returns the static CODEC instance for {@code clazz}. */ | ||
| private static Object getCodec(Class<?> clazz) | ||
| throws NoSuchFieldException, IllegalAccessException { | ||
| Field codecField = clazz.getDeclaredField("CODEC"); | ||
| codecField.setAccessible(true); | ||
| return codecField.get(null); | ||
| } | ||
| } |
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