1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.phone.vvm.omtp.sync; 18 19 import android.net.Network; 20 import android.support.annotation.NonNull; 21 import android.telecom.PhoneAccountHandle; 22 import com.android.phone.VoicemailStatus; 23 import com.android.phone.vvm.omtp.OmtpVvmCarrierConfigHelper; 24 import com.android.phone.vvm.omtp.VvmLog; 25 import java.io.Closeable; 26 import java.util.concurrent.CompletableFuture; 27 import java.util.concurrent.ExecutionException; 28 import java.util.concurrent.Future; 29 30 /** 31 * Class to retrieve a {@link Network} synchronously. {@link #getNetwork(OmtpVvmCarrierConfigHelper, 32 * PhoneAccountHandle)} will block until a suitable network is retrieved or it has failed. 33 */ 34 public class VvmNetworkRequest { 35 36 private static final String TAG = "VvmNetworkRequest"; 37 38 /** 39 * A wrapper around a Network returned by a {@link VvmNetworkRequestCallback}, which should be 40 * closed once not needed anymore. 41 */ 42 public static class NetworkWrapper implements Closeable { 43 44 private final Network mNetwork; 45 private final VvmNetworkRequestCallback mCallback; 46 NetworkWrapper(Network network, VvmNetworkRequestCallback callback)47 private NetworkWrapper(Network network, VvmNetworkRequestCallback callback) { 48 mNetwork = network; 49 mCallback = callback; 50 } 51 get()52 public Network get() { 53 return mNetwork; 54 } 55 56 @Override close()57 public void close() { 58 mCallback.releaseNetwork(); 59 } 60 } 61 62 public static class RequestFailedException extends Exception { 63 RequestFailedException(Throwable cause)64 private RequestFailedException(Throwable cause) { 65 super(cause); 66 } 67 } 68 69 @NonNull getNetwork(OmtpVvmCarrierConfigHelper config, PhoneAccountHandle handle, VoicemailStatus.Editor status)70 public static NetworkWrapper getNetwork(OmtpVvmCarrierConfigHelper config, 71 PhoneAccountHandle handle, VoicemailStatus.Editor status) throws RequestFailedException { 72 FutureNetworkRequestCallback callback = new FutureNetworkRequestCallback(config, handle, 73 status); 74 callback.requestNetwork(); 75 try { 76 return callback.getFuture().get(); 77 } catch (InterruptedException | ExecutionException e) { 78 callback.releaseNetwork(); 79 VvmLog.e(TAG, "can't get future network", e); 80 throw new RequestFailedException(e); 81 } 82 } 83 84 private static class FutureNetworkRequestCallback extends VvmNetworkRequestCallback { 85 86 /** 87 * {@link CompletableFuture#get()} will block until {@link CompletableFuture# 88 * complete(Object) } has been called on the other thread. 89 */ 90 private final CompletableFuture<NetworkWrapper> mFuture = new CompletableFuture<>(); 91 FutureNetworkRequestCallback(OmtpVvmCarrierConfigHelper config, PhoneAccountHandle phoneAccount, VoicemailStatus.Editor status)92 public FutureNetworkRequestCallback(OmtpVvmCarrierConfigHelper config, 93 PhoneAccountHandle phoneAccount, VoicemailStatus.Editor status) { 94 super(config, phoneAccount, status); 95 } 96 getFuture()97 public Future<NetworkWrapper> getFuture() { 98 return mFuture; 99 } 100 101 @Override onAvailable(Network network)102 public void onAvailable(Network network) { 103 super.onAvailable(network); 104 mFuture.complete(new NetworkWrapper(network, this)); 105 } 106 107 @Override onFailed(String reason)108 public void onFailed(String reason) { 109 super.onFailed(reason); 110 mFuture.complete(null); 111 } 112 113 } 114 } 115