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// 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.serializers;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.KryoException;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import com.google.protobuf.AbstractMessage;
import com.google.protobuf.InvalidProtocolBufferException;
/**
* Serializer for protos.
*
* <p>A separate instance must be registered for each distinct proto.
*/
public class ProtoSerializer<T extends AbstractMessage> extends Serializer<T> {
private final ParseFromHandle<T> handle;
/** Wrapper for {@code parseFrom} references. */
@FunctionalInterface
public static interface ParseFromHandle<T> {
T parseFrom(byte[] bytes) throws InvalidProtocolBufferException;
}
/**
* Constructor.
*
* @param handle reference to T.parseFrom
*/
public ProtoSerializer(ParseFromHandle<T> handle) {
setImmutable(true);
this.handle = handle;
}
@Override
public void write(Kryo kryo, Output output, T message) {
byte[] bytes = message.toByteArray();
output.writeInt(bytes.length, true);
output.writeBytes(bytes);
}
@Override
public T read(Kryo kryo, Input input, Class<T> type) {
try {
return handle.parseFrom(input.readBytes(input.readInt(true)));
} catch (InvalidProtocolBufferException e) {
throw new KryoException("Failed to parse " + type.getCanonicalName(), e);
}
}
}
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