399 lines
11 KiB
Kotlin
399 lines
11 KiB
Kotlin
/*
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* Copyright 2021 dorkbox, llc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.storage
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import com.esotericsoftware.kryo.Kryo
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import dorkbox.storage.types.MemoryStore
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import dorkbox.storage.types.PropertyStore
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import mu.KLogger
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import mu.KotlinLogging
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import org.slf4j.helpers.NOPLogger
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import java.io.File
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typealias AccessFunc = ((key: Any, value: Any, load: (key: Any, value: Any) -> Unit) -> Unit)
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abstract class Storage(val logger: KLogger) : AutoCloseable {
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companion object {
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/**
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* Gets the version number.
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*/
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const val version = "1.1"
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init {
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// Add this project to the updates system, which verifies this class + UUID + version information
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dorkbox.updates.Updates.add(Storage::class.java, "c1281a7c576c4a9db0823763ff2fe811", version)
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}
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const val versionTag = "__VERSION__"
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}
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fun init(initMessage: String) {
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// always initialize the version tag information
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if (getVersion() == -1L) {
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setVersion(0L)
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}
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KotlinLogging.logger("Storage").info(initMessage)
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}
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/**
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* @return the version of data stored in the database
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*/
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fun getVersion(): Long {
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return get(versionTag) ?: -1L
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}
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/**
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* Sets the version of data stored in the database
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*/
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abstract fun setVersion(version: Long)
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/**
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* @return the file that backs this storage
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*/
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abstract fun file(): File?
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/**
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* Returns the number of objects in the database.
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*/
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abstract fun size(): Int
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/**
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* Checks if there is a object corresponding to the given key.
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*/
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abstract operator fun contains(key: Any): Boolean
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/**
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* Reads an object using the specific key, and casts it to the expected class
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*/
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abstract operator fun <V> get(key: Any): V?
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/**
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* Returns the saved data for the specified key.
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*
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* @param key The key used to check if data already exists.
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* @param data This is the default value, and if there is no value with the key in the DB this default value will be returned AND saved.
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*/
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operator fun <V> get(key: Any, data: V): V {
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val current = get(key) as Any?
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if (current == null) {
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set(key, data)
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return data
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}
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@Suppress("UNCHECKED_CAST")
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return current as V
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}
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/**
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* Saves the given data to storage with the associated key.
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*
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* Setting to NULL removes the value
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*/
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abstract operator fun set(key: Any, data: Any?)
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/**
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* Deletes an object from storage.
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*/
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fun delete(key: Any) {
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set(key, null)
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}
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/**
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* Deletes all contents of this storage, and if applicable, it's location on disk.
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*/
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abstract fun deleteAll()
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/**
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* Closes this storage system
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*/
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abstract override fun close()
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interface Builder {
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/** true if the backing storage type uses strings for everything, or false if it uses something else */
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val isStringBased: Boolean
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/**
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* Builds the storage using the specified configuration
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*/
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fun build(): Storage
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/**
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* Allows for this storage type to be shared among [build] invocations. The first [build] will create the object used by all other [build] invocations (instead of creating a new one each time)
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*/
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fun shared(): Builder
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/**
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* Allows for custom load actions when keys/values need to be transformed before loading them from storage
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*
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* @param onLoad action to load data when the key/value pairs are read from storage
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*/
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fun onLoad(onLoad: AccessFunc): Builder
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/**
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* Allows for custom save actions when key/values need to be translated before saving them to storage\
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*
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* @param onSave action to save data when the key/value pairs are saved to storage.
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*/
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fun onSave(onSave: AccessFunc): Builder
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/**
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* Specify how to configure the kryo instance for serialization. This instance of kryo will be used to serialize the key/value data, which is subsequently saved to disk
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*/
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fun onNewSerializer(onNewKryo: Kryo.() -> Unit): Builder
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/**
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* Assigns a logger to use for the storage system. The default is a No Operation (NOP) logger which will ignore everything.
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*/
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fun logger(logger: KLogger): Builder
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}
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@Suppress("UNCHECKED_CAST")
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abstract class FileBuilder<B : Builder>: Builder {
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var onLoad: AccessFunc? = null
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var onSave: AccessFunc? = null
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var onNewKryo: Kryo.() -> Unit = { }
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var shared = false
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@Volatile var sharedBuild: Storage? = null
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var logger: KLogger = KotlinLogging.logger(NOPLogger.NOP_LOGGER)
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var file = File("storage.db")
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var readOnly = false
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var readOnlyViolent = false
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override val isStringBased = false
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internal fun manageShared(buildFun: () -> Storage): Storage {
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return if (shared) {
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if (sharedBuild == null) {
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sharedBuild = buildFun()
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}
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sharedBuild!!
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} else {
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buildFun()
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}
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}
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override fun shared(): B {
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shared = true
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return this as B
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}
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override fun onLoad(onLoad: AccessFunc): Builder {
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this.onLoad = onLoad
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return this
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}
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override fun onSave(onSave: AccessFunc): Builder {
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this.onSave = onSave
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return this
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}
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override fun onNewSerializer(onNewKryo: Kryo.() -> Unit): Builder {
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this.onNewKryo = onNewKryo
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return this
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}
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override fun logger(logger: KLogger): B {
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this.logger = logger
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return this as B
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}
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/**
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* Specify the file to write to on disk when saving objects
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*/
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fun file(file: File): B {
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this.file = file
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return this as B
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}
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/**
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* Specify the file to write to on disk when saving objects
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*/
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fun file(file: String): B {
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return file(File(file))
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}
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/**
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* Mark this storage system as read only (silently drop `set` operations)
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*/
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fun readOnly(): B{
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readOnly = true
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readOnlyViolent = false
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return this as B
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}
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/**
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* Mark this storage system as read only (throw an IOException for `set` operations)
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*/
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fun readOnlyThrowExceptions(): B {
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readOnly = true
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readOnlyViolent = true
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return this as B
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}
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}
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/**
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* An in-memory only storage system.
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*
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* This storage system DOES NOT care about serializing data, so `register` has no effect.
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*/
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class Memory : Builder {
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private var logger: KLogger = KotlinLogging.logger(NOPLogger.NOP_LOGGER)
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private var shared = false
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@Volatile private var sharedBuild: Storage? = null
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override val isStringBased = true
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override fun build(): Storage {
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return if (shared) {
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if (sharedBuild == null) {
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sharedBuild = MemoryStore(logger)
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}
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sharedBuild!!
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} else {
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MemoryStore(logger)
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}
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}
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override fun shared(): Memory {
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shared = true
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return this
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}
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override fun onLoad(onLoad: AccessFunc): Builder {
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return this
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}
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override fun onSave(onSave: AccessFunc): Builder {
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return this
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}
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override fun onNewSerializer(onNewKryo: Kryo.() -> Unit): Builder {
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return this
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}
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/**
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* Assigns a logger to use for the storage system. If null, then only errors will be logged to the error console.
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*/
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override fun logger(logger: KLogger): Builder {
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this.logger = logger
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return this
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}
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}
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/**
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* Java property file storage system
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*/
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class Property : Storage.FileBuilder<Property>() {
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private var autoLoad = false
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override val isStringBased = true
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/**
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* Builds the storage system
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*/
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override fun build(): Storage {
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return manageShared {
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PropertyStore(file.absoluteFile, autoLoad, readOnly, readOnlyViolent, logger, onNewKryo,
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onLoad, onSave)
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}
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}
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/**
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* Allow auto-loading any changes made to disk
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*/
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fun autoLoadChanges(): Property {
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autoLoad = true
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return this
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}
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}
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// /**
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// * JSON file storage system
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// */
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// class Json : Storage.FileBuilder<Json>() {
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// private var autoLoad = false
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//
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// override fun build(): Storage {
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// return manageShared {
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// JsonStore(file.absoluteFile, autoLoad, readOnly, readOnlyViolent, logger,
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// onLoad, onSave)
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// }
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// }
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//
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// /**
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// * Allow auto-loading any changes made to disk
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// */
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// fun autoLoadChanges(): Json {
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// autoLoad = true
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// return this
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// }
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// }
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// /**
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// * Lightning Memory Database
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// *
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// * https://github.com/lmdbjava/lmdbjava
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// */
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// class Lmdb<K> : SimpleBuilder<Lmdb<K>, K>() {
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// private var file = File("storage.db")
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// private var readOnly = false
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//
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// /**
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// * Builds the storage system
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// */
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// override fun build(): Storage<K> {
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// return manageShared { LmdbStore(file.absoluteFile, readOnly, serializationManager, logger,
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// onLoadKey, onSaveKey, onLoadValue, onSaveValue) }
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// }
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//
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// /**
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// * Specify the file to write to on disk when saving objects
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// */
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// fun file(file: File): Lmdb<K> {
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// this.file = file
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// return this
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// }
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//
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// /**
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// * Specify the file to write to on disk when saving objects
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// */
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// fun file(file: String): Lmdb<K> {
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// return file(File(file))
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// }
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//
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// /**
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// * Mark this storage system as read only
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// */
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// fun readOnly(): Lmdb<K> {
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// readOnly = true
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// return this
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// }
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// }
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}
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