com.zeoflow.depot.processor.cache.Cache.kt Maven / Gradle / Ivy

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The Depot persistence library provides an abstraction layer over SQLite to allow for more robust database access while using the full power of SQLite.

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/*
 * Copyright (C) 2021 ZeoFlow SRL
 *
 * 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.
 */

@file:Suppress("AddVarianceModifier")

package com.zeoflow.depot.processor.cache

import com.zeoflow.depot.compiler.processing.XElement
import com.zeoflow.depot.compiler.processing.XType
import com.zeoflow.depot.processor.FieldProcessor
import com.zeoflow.depot.vo.EmbeddedField
import com.zeoflow.depot.vo.Entity
import com.zeoflow.depot.vo.Pojo
import com.zeoflow.depot.vo.Warning
import java.util.LinkedHashSet

/**
 * A cache key can be used to avoid re-processing elements.
 * 
 * Each context has a cache variable that uses the same backing storage as the Root Context but
 * adds current adapters and warning suppression list to the key.
 */
class Cache(
    val parent: Cache?,
    val converters: LinkedHashSet,
    val suppressedWarnings: Set
) {
    val entities: Bucket = Bucket(parent?.entities)
    val pojos: Bucket = Bucket(parent?.pojos)

    inner class Bucket(source: Bucket?) {
        private val entries: MutableMap, T> = source?.entries ?: mutableMapOf()
        fun get(key: K, calculate: () -> T): T {
            val fullKey = FullKey(converters, suppressedWarnings, key)
            return entries.getOrPut(
                fullKey,
                {
                    calculate()
                }
            )
        }
    }

    /**
     * Key for Entity cache
     */
    data class EntityKey(val element: XElement)

    /**
     * Key for Pojo cache
     */
    data class PojoKey(
        val element: XElement,
        val scope: FieldProcessor.BindingScope,
        val parent: EmbeddedField?
    )

    /**
     * Internal key representation with adapters & warnings included.
     * 
     * Converters are kept in a linked set since the order is important for the TypeAdapterStore.
     */
    private data class FullKey(
        val converters: LinkedHashSet,
        val suppressedWarnings: Set,
        val key: T
    )
}