| /* |
| * 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 |
| } |