| /* |
| * Copyright (C) 2014 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 android.net; |
| |
| import static com.android.modules.utils.build.SdkLevel.isAtLeastS; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.content.Context; |
| import android.os.Looper; |
| import android.os.Message; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| |
| /** |
| * A NetworkFactory is an entity that creates NetworkAgent objects. |
| * The bearers register with ConnectivityService using {@link #register} and |
| * their factory will start receiving scored NetworkRequests. NetworkRequests |
| * can be filtered 3 ways: by NetworkCapabilities, by score and more complexly by |
| * overridden function. All of these can be dynamic - changing NetworkCapabilities |
| * or score forces re-evaluation of all current requests. |
| * |
| * If any requests pass the filter some overrideable functions will be called. |
| * If the bearer only cares about very simple start/stopNetwork callbacks, those |
| * functions can be overridden. If the bearer needs more interaction, it can |
| * override addNetworkRequest and removeNetworkRequest which will give it each |
| * request that passes their current filters. |
| * |
| * This class is mostly a shim which delegates to one of two implementations depending |
| * on the SDK level of the device it's running on. |
| * |
| * @hide |
| **/ |
| public class NetworkFactory { |
| static final boolean DBG = true; |
| static final boolean VDBG = false; |
| |
| final NetworkFactoryShim mImpl; |
| |
| private final String LOG_TAG; |
| |
| // Ideally the filter argument would be non-null, but null has historically meant to see |
| // no requests and telephony passes null. |
| public NetworkFactory(Looper looper, Context context, String logTag, |
| @Nullable final NetworkCapabilities filter) { |
| LOG_TAG = logTag; |
| if (isAtLeastS()) { |
| mImpl = new NetworkFactoryImpl(this, looper, context, filter); |
| } else { |
| mImpl = new NetworkFactoryLegacyImpl(this, looper, context, filter); |
| } |
| } |
| |
| // TODO : these two constants and the method are only used by telephony tests. Replace it in |
| // the tests and remove them and the associated code. |
| public static final int CMD_REQUEST_NETWORK = 1; |
| public static final int CMD_CANCEL_REQUEST = 2; |
| /** Like Handler#obtainMessage */ |
| @VisibleForTesting |
| public Message obtainMessage(final int what, final int arg1, final int arg2, |
| final @Nullable Object obj) { |
| return mImpl.obtainMessage(what, arg1, arg2, obj); |
| } |
| |
| // Called by BluetoothNetworkFactory |
| public final Looper getLooper() { |
| return mImpl.getLooper(); |
| } |
| |
| // Refcount for simple mode requests |
| private int mRefCount = 0; |
| |
| /* Registers this NetworkFactory with the system. May only be called once per factory. */ |
| public void register() { |
| mImpl.register(LOG_TAG); |
| } |
| |
| /** |
| * Registers this NetworkFactory with the system ignoring the score filter. This will let |
| * the factory always see all network requests matching its capabilities filter. |
| * May only be called once per factory. |
| */ |
| public void registerIgnoringScore() { |
| mImpl.registerIgnoringScore(LOG_TAG); |
| } |
| |
| /** Unregisters this NetworkFactory. After this call, the object can no longer be used. */ |
| public void terminate() { |
| mImpl.terminate(); |
| } |
| |
| protected final void reevaluateAllRequests() { |
| mImpl.reevaluateAllRequests(); |
| } |
| |
| /** |
| * Overridable function to provide complex filtering. |
| * Called for every request every time a new NetworkRequest is seen |
| * and whenever the filterScore or filterNetworkCapabilities change. |
| * |
| * acceptRequest can be overridden to provide complex filter behavior |
| * for the incoming requests |
| * |
| * For output, this class will call {@link #needNetworkFor} and |
| * {@link #releaseNetworkFor} for every request that passes the filters. |
| * If you don't need to see every request, you can leave the base |
| * implementations of those two functions and instead override |
| * {@link #startNetwork} and {@link #stopNetwork}. |
| * |
| * If you want to see every score fluctuation on every request, set |
| * your score filter to a very high number and watch {@link #needNetworkFor}. |
| * |
| * @return {@code true} to accept the request. |
| */ |
| public boolean acceptRequest(@NonNull final NetworkRequest request) { |
| return true; |
| } |
| |
| /** |
| * Can be called by a factory to release a request as unfulfillable: the request will be |
| * removed, and the caller will get a |
| * {@link ConnectivityManager.NetworkCallback#onUnavailable()} callback after this function |
| * returns. |
| * |
| * Note: this should only be called by factory which KNOWS that it is the ONLY factory which |
| * is able to fulfill this request! |
| */ |
| protected void releaseRequestAsUnfulfillableByAnyFactory(NetworkRequest r) { |
| mImpl.releaseRequestAsUnfulfillableByAnyFactory(r); |
| } |
| |
| // override to do simple mode (request independent) |
| protected void startNetwork() { } |
| protected void stopNetwork() { } |
| |
| // override to do fancier stuff |
| protected void needNetworkFor(@NonNull final NetworkRequest networkRequest) { |
| if (++mRefCount == 1) startNetwork(); |
| } |
| |
| protected void releaseNetworkFor(@NonNull final NetworkRequest networkRequest) { |
| if (--mRefCount == 0) stopNetwork(); |
| } |
| |
| /** |
| * @deprecated this method was never part of the API (system or public) and is only added |
| * for migration of existing clients. |
| */ |
| @Deprecated |
| public void setScoreFilter(final int score) { |
| mImpl.setScoreFilter(score); |
| } |
| |
| /** |
| * Set a score filter for this factory. |
| * |
| * This should include the transports the factory knows its networks will have, and |
| * an optimistic view of the attributes it may have. This does not commit the factory |
| * to being able to bring up such a network ; it only lets it avoid hearing about |
| * requests that it has no chance of fulfilling. |
| * |
| * @param score the filter |
| */ |
| public void setScoreFilter(@NonNull final NetworkScore score) { |
| mImpl.setScoreFilter(score); |
| } |
| |
| public void setCapabilityFilter(NetworkCapabilities netCap) { |
| mImpl.setCapabilityFilter(netCap); |
| } |
| |
| @VisibleForTesting |
| protected int getRequestCount() { |
| return mImpl.getRequestCount(); |
| } |
| |
| public int getSerialNumber() { |
| return mImpl.getSerialNumber(); |
| } |
| |
| public NetworkProvider getProvider() { |
| return mImpl.getProvider(); |
| } |
| |
| protected void log(String s) { |
| Log.d(LOG_TAG, s); |
| } |
| |
| public void dump(FileDescriptor fd, PrintWriter writer, String[] args) { |
| mImpl.dump(fd, writer, args); |
| } |
| |
| @Override |
| public String toString() { |
| return "{" + LOG_TAG + " " + mImpl.toString() + "}"; |
| } |
| } |