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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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.android.server
import java.util.concurrent.atomic.AtomicInteger
/**
* A [NetIdManager] that generates ID starting from [NetIdManager.MAX_NET_ID] and decreasing, rather
* than starting from [NetIdManager.MIN_NET_ID] and increasing.
*
* Useful for testing ConnectivityService, to minimize the risk of test ConnectivityService netIDs
* overlapping with netIDs used by the real ConnectivityService on the device.
*
* IDs may still overlap if many networks have been used on the device (so the "real" netIDs
* are close to MAX_NET_ID), but this is typically not the case when running unit tests. Also, there
* is no way to fully solve the overlap issue without altering ID allocation in non-test code, as
* the real ConnectivityService could start using netIds that have been used by the test in the
* past.
*/
class TestNetIdManager : NetIdManager() {
private val nextId = AtomicInteger(MAX_NET_ID)
override fun reserveNetId() = nextId.decrementAndGet()
override fun releaseNetId(id: Int) = Unit
}
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