| // Copyright (C) 2020 The Android Open Source Project |
| // |
| // 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.googlesource.gerrit.modules.cache.chroniclemap; |
| |
| import java.nio.ByteBuffer; |
| import net.openhft.chronicle.bytes.Bytes; |
| import net.openhft.chronicle.core.util.ReadResolvable; |
| import net.openhft.chronicle.hash.serialization.BytesReader; |
| import net.openhft.chronicle.hash.serialization.BytesWriter; |
| |
| public class TimedValueMarshaller<V> |
| implements BytesWriter<TimedValue<V>>, |
| BytesReader<TimedValue<V>>, |
| ReadResolvable<TimedValueMarshaller<V>> { |
| |
| private final String name; |
| |
| TimedValueMarshaller(String name) { |
| this.name = name; |
| } |
| |
| @Override |
| public TimedValueMarshaller<V> readResolve() { |
| return new TimedValueMarshaller<>(name); |
| } |
| |
| @SuppressWarnings({"rawtypes", "unchecked"}) |
| @Override |
| public TimedValue<V> read(Bytes in, TimedValue<V> using) { |
| long initialPosition = in.readPosition(); |
| |
| // Deserialize the creation timestamp (first 8 bytes) |
| byte[] serializedLong = new byte[Long.BYTES]; |
| in.read(serializedLong, 0, Long.BYTES); |
| ByteBuffer buffer = ByteBuffer.wrap(serializedLong); |
| long created = buffer.getLong(0); |
| in.readPosition(initialPosition + Long.BYTES); |
| |
| // Deserialize the length of the serialized value (second 8 bytes) |
| byte[] serializedInt = new byte[Integer.BYTES]; |
| in.read(serializedInt, 0, Integer.BYTES); |
| ByteBuffer buffer2 = ByteBuffer.wrap(serializedInt); |
| int vLength = buffer2.getInt(0); |
| in.readPosition(initialPosition + Long.BYTES + Integer.BYTES); |
| |
| // Deserialize object V (remaining bytes) |
| byte[] serializedV = new byte[vLength]; |
| in.read(serializedV, 0, vLength); |
| V v = (V) CacheSerializers.getValueSerializer(name).deserialize(serializedV); |
| |
| using = new TimedValue<>(v, created); |
| |
| return using; |
| } |
| |
| @SuppressWarnings("rawtypes") |
| @Override |
| public void write(Bytes out, TimedValue<V> toWrite) { |
| byte[] serialized = CacheSerializers.getValueSerializer(name).serialize(toWrite.getValue()); |
| |
| // Serialize as follows: |
| // created | length of serialized V | serialized value V |
| // 8 bytes | 4 bytes | serialized_length bytes |
| |
| int capacity = Long.BYTES + Integer.BYTES + serialized.length; |
| ByteBuffer buffer = ByteBuffer.allocate(capacity); |
| |
| long timestamp = toWrite.getCreated(); |
| buffer.putLong(0, timestamp); |
| |
| buffer.position(Long.BYTES); |
| buffer.putInt(serialized.length); |
| |
| buffer.position(Long.BYTES + Integer.BYTES); |
| buffer.put(serialized); |
| |
| out.write(buffer.array()); |
| } |
| } |