| /* |
| * 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 android.net; |
| |
| import android.annotation.NonNull; |
| import android.content.Context; |
| import android.net.networkstack.ModuleNetworkStackClient; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.atomic.AtomicReference; |
| import java.util.function.Consumer; |
| |
| /** |
| * Manager class used to communicate with the ip memory store service in the network stack, |
| * which is running in a separate module. |
| * @hide |
| */ |
| public class IpMemoryStore extends IpMemoryStoreClient { |
| private static final String TAG = IpMemoryStore.class.getSimpleName(); |
| @NonNull private final CompletableFuture<IIpMemoryStore> mService; |
| @NonNull private final AtomicReference<CompletableFuture<IIpMemoryStore>> mTailNode; |
| |
| public IpMemoryStore(@NonNull final Context context) { |
| super(context); |
| mService = new CompletableFuture<>(); |
| mTailNode = new AtomicReference<CompletableFuture<IIpMemoryStore>>(mService); |
| getModuleNetworkStackClient(context).fetchIpMemoryStore( |
| new IIpMemoryStoreCallbacks.Stub() { |
| @Override |
| public void onIpMemoryStoreFetched(@NonNull final IIpMemoryStore memoryStore) { |
| mService.complete(memoryStore); |
| } |
| |
| @Override |
| public int getInterfaceVersion() { |
| return this.VERSION; |
| } |
| |
| @Override |
| public String getInterfaceHash() { |
| return this.HASH; |
| } |
| }); |
| } |
| |
| /* |
| * If the IpMemoryStore is ready, this function will run the request synchronously. |
| * Otherwise, it will enqueue the requests for execution immediately after the |
| * service becomes ready. The requests are guaranteed to be executed in the order |
| * they are sumbitted. |
| */ |
| @Override |
| protected void runWhenServiceReady(Consumer<IIpMemoryStore> cb) throws ExecutionException { |
| mTailNode.getAndUpdate(future -> future.handle((store, exception) -> { |
| if (exception != null) { |
| // this should never happens since we also catch the exception below |
| Log.wtf(TAG, "Error fetching IpMemoryStore", exception); |
| return store; |
| } |
| |
| try { |
| cb.accept(store); |
| } catch (Exception e) { |
| Log.wtf(TAG, "Exception occured: " + e.getMessage()); |
| } |
| return store; |
| })); |
| } |
| |
| @VisibleForTesting |
| protected ModuleNetworkStackClient getModuleNetworkStackClient(Context context) { |
| return ModuleNetworkStackClient.getInstance(context); |
| } |
| |
| /** Gets an instance of the memory store */ |
| @NonNull |
| public static IpMemoryStore getMemoryStore(final Context context) { |
| return new IpMemoryStore(context); |
| } |
| } |