1 /*
2  * Copyright (C) 2022 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.server.backup.transport;
18 
19 import android.app.backup.BackupTransport;
20 import android.os.RemoteException;
21 import android.util.Slog;
22 
23 import com.android.internal.annotations.GuardedBy;
24 import com.android.internal.annotations.VisibleForTesting;
25 import com.android.internal.backup.ITransportStatusCallback;
26 import com.android.server.backup.BackupAndRestoreFeatureFlags;
27 
28 public class TransportStatusCallback extends ITransportStatusCallback.Stub {
29     private static final String TAG = "TransportStatusCallback";
30     private static final int OPERATION_STATUS_DEFAULT = 0;
31 
32     private final long mOperationTimeout;
33 
34     @GuardedBy("this")
35     private int mOperationStatus = OPERATION_STATUS_DEFAULT;
36     @GuardedBy("this")
37     private boolean mHasCompletedOperation = false;
38 
TransportStatusCallback()39     public TransportStatusCallback() {
40         mOperationTimeout = BackupAndRestoreFeatureFlags.getBackupTransportCallbackTimeoutMillis();
41     }
42 
43     @VisibleForTesting
TransportStatusCallback(int operationTimeout)44     TransportStatusCallback(int operationTimeout) {
45         mOperationTimeout = operationTimeout;
46     }
47 
48     @Override
onOperationCompleteWithStatus(int status)49     public synchronized void onOperationCompleteWithStatus(int status) throws RemoteException {
50         mHasCompletedOperation = true;
51         mOperationStatus = status;
52 
53         notifyAll();
54     }
55 
56     @Override
onOperationComplete()57     public synchronized void onOperationComplete() throws RemoteException {
58         onOperationCompleteWithStatus(OPERATION_STATUS_DEFAULT);
59     }
60 
getOperationStatus()61     synchronized int getOperationStatus() {
62         if (mHasCompletedOperation) {
63             return mOperationStatus;
64         }
65 
66         long timeoutLeft = mOperationTimeout;
67         try {
68             while (!mHasCompletedOperation && timeoutLeft > 0) {
69                 long waitStartTime = System.currentTimeMillis();
70                 wait(timeoutLeft);
71                 if (mHasCompletedOperation) {
72                     return mOperationStatus;
73                 }
74                 timeoutLeft -= System.currentTimeMillis() - waitStartTime;
75             }
76 
77             Slog.w(TAG, "Couldn't get operation status from transport");
78         } catch (InterruptedException e) {
79             Slog.w(TAG, "Couldn't get operation status from transport: ", e);
80         }
81 
82         return BackupTransport.TRANSPORT_ERROR;
83     }
84 
reset()85     synchronized void reset() {
86         mHasCompletedOperation = false;
87         mOperationStatus = OPERATION_STATUS_DEFAULT;
88     }
89 }
90