40 lines
1.7 KiB
Kotlin
40 lines
1.7 KiB
Kotlin
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.server
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import java.util.concurrent.atomic.AtomicInteger
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/**
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* A [NetIdManager] that generates ID starting from [NetIdManager.MAX_NET_ID] and decreasing, rather
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* than starting from [NetIdManager.MIN_NET_ID] and increasing.
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*
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* Useful for testing ConnectivityService, to minimize the risk of test ConnectivityService netIDs
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* overlapping with netIDs used by the real ConnectivityService on the device.
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*
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* IDs may still overlap if many networks have been used on the device (so the "real" netIDs
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* are close to MAX_NET_ID), but this is typically not the case when running unit tests. Also, there
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* is no way to fully solve the overlap issue without altering ID allocation in non-test code, as
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* the real ConnectivityService could start using netIds that have been used by the test in the
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* past.
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*/
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class TestNetIdManager : NetIdManager() {
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private val nextId = AtomicInteger(MAX_NET_ID)
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override fun reserveNetId() = nextId.decrementAndGet()
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override fun releaseNetId(id: Int) = Unit
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fun peekNextNetId() = nextId.get() - 1
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}
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