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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
package org.mozilla.focus.telemetry
import android.content.Context
import androidx.annotation.VisibleForTesting
import mozilla.components.support.utils.Browsers
/**
* Caches the list of browsers installed on a user's device.
*
* BrowsersCache caches the list of installed browsers is gathered lazily when it is first accessed
* after initial creation or invalidation. For that reason, a context is required every time
* the cache is accessed.
*
* Users are responsible for invalidating the cache at the appropriate time. It is left up to the
* user to determine appropriate policies for maintaining the validity of the cache. If, when the
* cache is accessed, it is filled, the contents will be returned. As mentioned above, the cache
* will be lazily refilled after invalidation. In other words, invalidation is O(1).
*
* This cache is threadsafe.
*/
object BrowsersCache {
@VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
internal var cachedBrowsers: Browsers? = null
@Synchronized
fun all(context: Context): Browsers {
run {
val cachedBrowsers = cachedBrowsers
if (cachedBrowsers != null) {
return cachedBrowsers
}
}
return Browsers.all(context).also {
cachedBrowsers = it
}
}
}