plugins/base/src/main/kotlin/resolvers/external/ExternalLocationProviderFactoryWithCache.kt


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package org.jetbrains.dokka.base.resolvers.external

import org.jetbrains.dokka.base.resolvers.shared.ExternalDocumentation
import java.util.concurrent.ConcurrentHashMap

class ExternalLocationProviderFactoryWithCache(val ext: ExternalLocationProviderFactory) :
    ExternalLocationProviderFactory {

    private val locationProviders = ConcurrentHashMap<ExternalDocumentation, CacheWrapper>()

    override fun getExternalLocationProvider(doc: ExternalDocumentation): ExternalLocationProvider? =
        locationProviders.getOrPut(doc) { CacheWrapper(ext.getExternalLocationProvider(doc)) }.provider

    private class CacheWrapper(val provider: ExternalLocationProvider?)
}