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
|
/*
* Copyright (C) 2018 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.example.android.systemupdatersample;
import android.util.SparseArray;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Controls updater state.
*/
public class UpdaterState {
public static final int IDLE = 0;
public static final int ERROR = 1;
public static final int RUNNING = 2;
public static final int PAUSED = 3;
public static final int SLOT_SWITCH_REQUIRED = 4;
public static final int REBOOT_REQUIRED = 5;
private static final SparseArray<String> STATE_MAP = new SparseArray<>();
static {
STATE_MAP.put(0, "IDLE");
STATE_MAP.put(1, "ERROR");
STATE_MAP.put(2, "RUNNING");
STATE_MAP.put(3, "PAUSED");
STATE_MAP.put(4, "SLOT_SWITCH_REQUIRED");
STATE_MAP.put(5, "REBOOT_REQUIRED");
}
/**
* Allowed state transitions. It's a map: key is a state, value is a set of states that
* are allowed to transition to from key.
*/
private static final ImmutableMap<Integer, ImmutableSet<Integer>> TRANSITIONS =
ImmutableMap.<Integer, ImmutableSet<Integer>>builder()
.put(IDLE, ImmutableSet.of(ERROR, RUNNING))
.put(RUNNING, ImmutableSet.of(
ERROR, PAUSED, REBOOT_REQUIRED, SLOT_SWITCH_REQUIRED))
.put(PAUSED, ImmutableSet.of(ERROR, RUNNING, IDLE))
.put(SLOT_SWITCH_REQUIRED, ImmutableSet.of(ERROR, IDLE))
.put(ERROR, ImmutableSet.of(IDLE))
.put(REBOOT_REQUIRED, ImmutableSet.of(IDLE))
.build();
private AtomicInteger mState;
public UpdaterState(int state) {
this.mState = new AtomicInteger(state);
}
/**
* Returns updater state.
*/
public int get() {
return mState.get();
}
/**
* Sets the updater state.
*
* @throws InvalidTransitionException if transition is not allowed.
*/
public void set(int newState) throws InvalidTransitionException {
int oldState = mState.get();
if (!TRANSITIONS.get(oldState).contains(newState)) {
throw new InvalidTransitionException(
"Can't transition from " + oldState + " to " + newState);
}
mState.set(newState);
}
/**
* Converts status code to status name.
*/
public static String getStateText(int state) {
return STATE_MAP.get(state);
}
/**
* Defines invalid state transition exception.
*/
public static class InvalidTransitionException extends Exception {
public InvalidTransitionException(String msg) {
super(msg);
}
}
}
|
