cache.maybePrepareModel {
            delegate.beforeTasks(action)
        }
    }

    override fun <T : Any?> fromBuildModel(action: BuildTreeModelAction<out T>): T? {
        return cache.loadOrCreateModel {
            val model = delegate.fromBuildModel(action)
            if (model == null) BuildTreeModel.NullModel else BuildTreeModel.Model(model)
        }.result()
    }

    fun maybePrepareModel(action: () -> Unit)

    /**
     * Loads the cached model, if available, or else runs the given function to create it and then writes the result to the cache.
     */
    fun <T : Any> loadOrCreateModel(creator: () -> T): T

    /**
     * Loads a cached intermediate model, if available, or else runs the given function to create it and then writes the result to the cache.
     *

        if (isLoaded) {
            return
        }
        runWorkThatContributesToCacheEntry {
            action()
        }
    }

    override fun <T : Any> loadOrCreateModel(creator: () -> T): T {
        if (isLoaded) {
            runLoadedSideEffects()
            return loadModel().uncheckedCast()
        }

        return runWorkThatContributesToCacheEntry {