| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.tuweni.kv |
| |
| import kotlinx.coroutines.Dispatchers |
| import org.apache.tuweni.bytes.Bytes |
| import org.rocksdb.Options |
| import org.rocksdb.RocksDB |
| import org.rocksdb.RocksIterator |
| import java.io.IOException |
| import java.nio.file.Files |
| import java.nio.file.Path |
| import java.util.concurrent.atomic.AtomicBoolean |
| import java.util.function.Function |
| import kotlin.coroutines.CoroutineContext |
| |
| /** |
| * A key-value store backed by RocksDB. |
| * |
| * @param dbPath The path to the RocksDB database. |
| * @param options Options for the RocksDB database. |
| * @param coroutineContext The co-routine context for blocking tasks. |
| * @return A key-value store. |
| * @throws IOException If an I/O error occurs. |
| * @constructor Open a RocksDB-backed key-value store. |
| */ |
| class RocksDBKeyValueStore<K, V> |
| @Throws(IOException::class) |
| constructor( |
| dbPath: Path, |
| private val keySerializer: (K) -> Bytes, |
| private val valueSerializer: (V) -> Bytes, |
| private val keyDeserializer: (Bytes) -> K, |
| private val valueDeserializer: (Bytes) -> V, |
| options: Options = Options().setCreateIfMissing(true).setWriteBufferSize(268435456).setMaxOpenFiles(-1), |
| override val coroutineContext: CoroutineContext = Dispatchers.IO |
| ) : KeyValueStore<K, V> { |
| |
| companion object { |
| /** |
| * Open a RocksDB-backed key-value store. |
| * |
| * @param dbPath The path to the RocksDB database. |
| * @param keySerializer the serializer of key objects to bytes |
| * @param valueSerializer the serializer of value objects to bytes |
| * @param keyDeserializer the deserializer of keys from bytes |
| * @param valueDeserializer the deserializer of values from bytes |
| * @return A key-value store. |
| * @throws IOException If an I/O error occurs. |
| */ |
| @JvmStatic |
| @Throws(IOException::class) |
| fun <K, V> open( |
| dbPath: Path, |
| keySerializer: Function<K, Bytes>, |
| valueSerializer: Function<V, Bytes>, |
| keyDeserializer: Function<Bytes, K>, |
| valueDeserializer: Function<Bytes, V> |
| ) = RocksDBKeyValueStore(dbPath, |
| keySerializer::apply, |
| valueSerializer::apply, |
| keyDeserializer::apply, |
| valueDeserializer::apply) |
| |
| /** |
| * Open a RocksDB-backed key-value store. |
| * |
| * @param dbPath The path to the RocksDB database. |
| * @param keySerializer the serializer of key objects to bytes |
| * @param valueSerializer the serializer of value objects to bytes |
| * @param keyDeserializer the deserializer of keys from bytes |
| * @param valueDeserializer the deserializer of values from bytes |
| * @param options Options for the RocksDB database. |
| * @return A key-value store. |
| * @throws IOException If an I/O error occurs. |
| */ |
| @JvmStatic |
| @Throws(IOException::class) |
| fun <K, V> open( |
| dbPath: Path, |
| keySerializer: Function<K, Bytes>, |
| valueSerializer: Function<V, Bytes>, |
| keyDeserializer: Function<Bytes, K>, |
| valueDeserializer: Function<Bytes, V>, |
| options: Options |
| ) = |
| RocksDBKeyValueStore(dbPath, |
| keySerializer::apply, |
| valueSerializer::apply, |
| keyDeserializer::apply, |
| valueDeserializer::apply, |
| options) |
| } |
| |
| private val db: RocksDB |
| private val closed = AtomicBoolean(false) |
| |
| init { |
| RocksDB.loadLibrary() |
| Files.createDirectories(dbPath) |
| db = RocksDB.open(options, dbPath.toAbsolutePath().toString()) |
| } |
| |
| override suspend fun get(key: K): V? { |
| if (closed.get()) { |
| throw IllegalStateException("Closed DB") |
| } |
| val rawValue = db[keySerializer(key).toArrayUnsafe()] |
| return if (rawValue == null) { |
| null |
| } else { |
| valueDeserializer(Bytes.wrap(rawValue)) |
| } |
| } |
| |
| override suspend fun put(key: K, value: V) { |
| if (closed.get()) { |
| throw IllegalStateException("Closed DB") |
| } |
| db.put(keySerializer(key).toArrayUnsafe(), valueSerializer(value).toArrayUnsafe()) |
| } |
| |
| private class BytesIterator<K>(val rIterator: RocksIterator, val keyDeserializer: (Bytes) -> K) : Iterator<K> { |
| |
| override fun hasNext(): Boolean = rIterator.isValid |
| |
| override fun next(): K { |
| val key = rIterator.key() |
| rIterator.next() |
| return keyDeserializer(Bytes.wrap(key)) |
| } |
| } |
| |
| override suspend fun keys(): Iterable<K> { |
| if (closed.get()) { |
| throw IllegalStateException("Closed DB") |
| } |
| val iter = db.newIterator() |
| iter.seekToFirst() |
| return Iterable { BytesIterator(iter, keyDeserializer) } |
| } |
| |
| /** |
| * Closes the underlying RocksDB instance. |
| */ |
| override fun close() { |
| if (closed.compareAndSet(false, true)) { |
| db.close() |
| } |
| } |
| } |