secretblob.SecretBlobCacheDecorator.kt Maven / Gradle / Ivy

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Kotlin Again SHell

There is a newer version: 0.3.1

package se.wollan.crypto.secretblob

import java.util.concurrent.ConcurrentHashMap

internal class SecretBlobCacheDecorator(private val inner: SecretBlob, keys: List) : SecretBlob {
    private val cache = ConcurrentHashMap(keys.size)

    override fun getSecretDataForKey(key: SecretBlobKey): ByteArray {
        cache[key]?.let { return it.copyOf() }

        val data = inner.getSecretDataForKey(key)

        // no need to copy here as no one is holding a reference to data according to the contract of getSecretDataForKey
        cache[key] = data

        return data.copyOf()
    }
}