1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* 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.quickstep.util;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;
import com.android.quickstep.TouchInteractionService;
import com.android.quickstep.TouchInteractionService.TISBinder;
import java.util.ArrayList;
import java.util.function.Consumer;
/**
* Utility class to simplify binding to {@link TouchInteractionService}
*/
public class TISBindHelper implements ServiceConnection {
private static final String TAG = "TISBindHelper";
private static final long BACKOFF_MILLIS = 1000;
// Max backoff caps at 5 mins
private static final long MAX_BACKOFF_MILLIS = 10 * 60 * 1000;
private final Handler mHandler = new Handler();
private final Runnable mConnectionRunnable = this::internalBindToTIS;
private final Context mContext;
private final Consumer<TISBinder> mConnectionCallback;
private final ArrayList<Runnable> mPendingConnectedCallbacks = new ArrayList<>();
private short mConnectionAttempts;
private boolean mTisServiceBound;
private boolean mIsConnected;
public TISBindHelper(Context context, Consumer<TISBinder> connectionCallback) {
mContext = context;
mConnectionCallback = connectionCallback;
internalBindToTIS();
}
@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
if (!(iBinder instanceof TISBinder)) {
// Seems like there can be a race condition when user unlocks, which kills the TIS
// process and re-starts it. I guess in the meantime service can be connected to
// a killed TIS? Either way, unbind and try to re-connect in that case.
internalUnbindToTIS();
mHandler.postDelayed(mConnectionRunnable, BACKOFF_MILLIS);
return;
}
Log.d(TAG, "TIS service connected");
mIsConnected = true;
mConnectionCallback.accept((TISBinder) iBinder);
// Flush the pending callbacks
for (Runnable r : mPendingConnectedCallbacks) {
r.run();
}
mPendingConnectedCallbacks.clear();
resetServiceBindRetryState();
}
@Override
public void onServiceDisconnected(ComponentName componentName) { }
@Override
public void onBindingDied(ComponentName name) {
Log.w(TAG, "TIS binding died");
internalBindToTIS();
}
/**
* Runs the given {@param r} runnable when the service is connected.
*/
public void runOnBindToTouchInteractionService(Runnable r) {
if (mIsConnected) {
r.run();
} else {
mPendingConnectedCallbacks.add(r);
}
}
/**
* Binds to {@link TouchInteractionService}. If the binding fails, attempts to retry via
* {@link #mConnectionRunnable}. Unbind via {@link #internalUnbindToTIS()}
*/
private void internalBindToTIS() {
mTisServiceBound = mContext.bindService(new Intent(mContext, TouchInteractionService.class),
this, 0);
if (mTisServiceBound) {
resetServiceBindRetryState();
return;
}
Log.w(TAG, "Retrying TIS Binder connection attempt: " + mConnectionAttempts);
final long timeoutMs = (long) Math.min(
Math.scalb(BACKOFF_MILLIS, mConnectionAttempts), MAX_BACKOFF_MILLIS);
mHandler.postDelayed(mConnectionRunnable, timeoutMs);
mConnectionAttempts++;
}
/** See {@link #internalBindToTIS()} */
private void internalUnbindToTIS() {
if (mTisServiceBound) {
mContext.unbindService(this);
mTisServiceBound = false;
}
}
private void resetServiceBindRetryState() {
if (mHandler.hasCallbacks(mConnectionRunnable)) {
mHandler.removeCallbacks(mConnectionRunnable);
}
mConnectionAttempts = 0;
}
/**
* Called when the activity is destroyed to clear the binding
*/
public void onDestroy() {
internalUnbindToTIS();
resetServiceBindRetryState();
mIsConnected = false;
mPendingConnectedCallbacks.clear();
}
}
|
