com.jtransc.util.cache.kt Maven / Gradle / Ivy
/*
* Copyright 2016 Carlos Ballesteros Velasco
*
* 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.jtransc.util
import com.jtransc.vfs.LocalVfs
import com.jtransc.vfs.SyncVfs
import com.jtransc.vfs.SyncVfsFile
import java.io.File
object PersistentBinaryCache {
val tempFolder by lazy { System.getProperty("java.io.tmpdir") }
private val tempVfs by lazy { LocalVfs(File(tempFolder)) }
private fun file(key:String):SyncVfsFile {
val basename = File(key).name
return tempVfs["$basename.cache"]
}
operator fun contains(key: String) = file(key).exists
operator fun set(key: String, value: ByteArray) = file(key).write(value)
operator fun get(key: String): ByteArray? = file(key).readOrNull()
}
class PersistentCache {
val pbc = PersistentBinaryCache
init {
println("PersistentCache: ${pbc.tempFolder}")
}
operator fun contains(key: String) = key in pbc
operator fun set(key: String, value: V) {
pbc[key] = BinarySerializer.serialize(value)
}
operator fun get(key: String): V? {
val bvalue = pbc[key]
return if (bvalue != null) BinarySerializer.deserialize(bvalue) else null
}
fun getCalc(key: String, calculate: (key: String) -> V): V {
if (key !in this) {
val obj = calculate(key)
set(key, obj)
return obj
} else {
return get(key)!!
}
}
}