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/*
* Copyright (C) 2021 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.connectivity;
import android.content.Context;
import com.android.internal.annotations.VisibleForTesting;
import com.android.server.ConnectivityService;
/**
* Collection of constants for the connectivity module.
*/
public final class ConnectivityFlags {
/**
* Minimum module version at which to avoid rematching all requests when a network request is
* registered, and rematch only the registered requests instead.
*/
@VisibleForTesting
public static final String NO_REMATCH_ALL_REQUESTS_ON_REGISTER =
"no_rematch_all_requests_on_register";
private boolean mNoRematchAllRequestsOnRegister;
/**
* Whether ConnectivityService should avoid avoid rematching all requests when a network
* request is registered, and rematch only the registered requests instead.
*
* This flag is disabled by default.
*
* IMPORTANT NOTE: This flag is false by default and will only be loaded in ConnectivityService
* systemReady. It is also not volatile for performance reasons, so for most threads it may
* only change to true after some time. This is fine for this particular flag because it only
* controls whether all requests or a subset of requests should be rematched, which is only
* a performance optimization, so its value does not need to be consistent over time; but most
* flags will not have these properties and should not use the same model.
*
* TODO: when adding other flags, consider the appropriate timing to load them, and necessary
* threading guarantees according to the semantics of the flags.
*/
public boolean noRematchAllRequestsOnRegister() {
return mNoRematchAllRequestsOnRegister;
}
/**
* Load flag values. Should only be called once, and can only be called once PackageManager is
* ready.
*/
public void loadFlags(ConnectivityService.Dependencies deps, Context ctx) {
mNoRematchAllRequestsOnRegister = deps.isFeatureEnabled(
ctx, NO_REMATCH_ALL_REQUESTS_ON_REGISTER, false /* defaultEnabled */);
}
}
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