| // 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 com.google.gerrit.metrics.MetricMaker; |
| import com.google.gerrit.metrics.Timer0; |
| import com.google.gerrit.server.cache.serialize.CacheSerializer; |
| 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> extends SerializationMetricsForCache |
| implements BytesWriter<TimedValue<V>>, |
| BytesReader<TimedValue<V>>, |
| ReadResolvable<TimedValueMarshaller<V>> { |
| |
| private static final ThreadLocal<byte[]> staticBuffer = |
| new ThreadLocal<byte[]>() { |
| @Override |
| protected byte[] initialValue() { |
| return new byte[Long.BYTES + Integer.BYTES]; |
| } |
| }; |
| |
| private final CacheSerializer<V> cacheSerializer; |
| |
| TimedValueMarshaller(MetricMaker metricMaker, String name) { |
| super(metricMaker, name); |
| this.cacheSerializer = CacheSerializers.getValueSerializer(name); |
| } |
| |
| private TimedValueMarshaller(Metrics metrics, String name) { |
| super(metrics, name); |
| this.cacheSerializer = CacheSerializers.getValueSerializer(name); |
| } |
| |
| @Override |
| public TimedValueMarshaller<V> readResolve() { |
| return new TimedValueMarshaller<>(metrics, name); |
| } |
| |
| @SuppressWarnings("rawtypes") |
| @Override |
| public TimedValue<V> read(Bytes in, TimedValue<V> using) { |
| try (Timer0.Context timer = metrics.deserializeLatency.start()) { |
| byte[] bytesBuffer = staticBuffer.get(); |
| in.read(bytesBuffer); |
| ByteBuffer buffer = ByteBuffer.wrap(bytesBuffer); |
| long created = buffer.getLong(); |
| int vLength = buffer.getInt(); |
| |
| // Deserialize object V (remaining bytes) |
| byte[] serializedV = new byte[vLength]; |
| in.read(serializedV); |
| V v = cacheSerializer.deserialize(serializedV); |
| |
| if (using == null) { |
| using = new TimedValue<>(v, created); |
| } else { |
| using.setCreated(created); |
| using.setValue(v); |
| } |
| return using; |
| } |
| } |
| |
| @SuppressWarnings("rawtypes") |
| @Override |
| public void write(Bytes out, TimedValue<V> toWrite) { |
| try (Timer0.Context timer = metrics.serializeLatency.start()) { |
| byte[] serialized = cacheSerializer.serialize(toWrite.getValue()); |
| |
| // Serialize as follows: |
| // created | length of serialized V | serialized value V |
| // 8 bytes | 4 bytes | serialized_length bytes |
| byte[] bytesBuffer = staticBuffer.get(); |
| ByteBuffer buffer = ByteBuffer.wrap(bytesBuffer); |
| buffer.putLong(toWrite.getCreated()); |
| buffer.putInt(serialized.length); |
| out.write(bytesBuffer); |
| out.write(serialized); |
| } |
| } |
| } |