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/*
* Copyright (C) 2018 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 android.databinding.tool.reflection
import android.databinding.tool.util.L
/**
* A cache object that can index classes based on when it is found and its imports.
*/
class ClassFinderCache(
private val doFind : ((className : String, imports : ImportBag?) -> ModelClass?)
) {
private val cache = mutableMapOf<CacheKey, ModelClass>()
private val importCache = mutableMapOf<ImportBag, ImmutableImportBag>()
private var hit = 0
private var miss = 0
private var missForNull = 0
fun find(className : String, imports: ImportBag?) : ModelClass? {
val immutableImports = if(imports == null) {
null
} else {
importCache.getOrPut(imports) {
imports.toImmutable()
}
}
val key = CacheKey(className = className, imports = immutableImports)
val existing = cache[key]
if (existing == null) {
miss ++
val found = doFind(className, imports)
if (found == null) {
missForNull ++
} else {
cache[key] = found
return found
}
return found
} else {
hit++
return existing
}
}
fun logStats() {
val ratio = (miss * 1f) / (miss + hit)
val nonNullMiss = miss - missForNull
val nonNullRatio = (nonNullMiss * 1f) / (nonNullMiss + hit)
L.w("class finder cache: miss: $miss, hit: $hit, ratio : $ratio, ratio w/o nulls: $nonNullRatio")
}
private data class CacheKey(
val className: String,
val imports: ImmutableImportBag?
)
}
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