CameraTraces.h revision ff3e31d2b100d8efd969b358b18e4405c49dd10d 
1/*
2 * Copyright (C) 2013 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#ifndef ANDROID_SERVERS_CAMERA_TRACES_H_
18#define ANDROID_SERVERS_CAMERA_TRACES_H_
19
20#include <utils/Errors.h>
21#include <utils/String16.h>
22#include <utils/Vector.h>
23
24namespace android {
25namespace camera3 {
26
27class CameraTracesImpl;
28
29// Collect a list of the process's stack traces
30class CameraTraces {
31public:
32    /**
33     * Save the current stack trace for each thread in the process. At most
34     * MAX_TRACES will be saved, after which the oldest traces will be discarded.
35     *
36     * <p>Use CameraTraces::dump to print out the traces.</p>
37     */
38    static void     saveTrace();
39
40    /**
41     * Prints all saved traces to the specified file descriptor.
42     *
43     * <p>Each line is indented by DUMP_INDENT spaces.</p>
44     */
45    static status_t dump(int fd, const Vector<String16>& args);
46
47private:
48    enum {
49        // Don't collect more than 100 traces. Discard oldest.
50        MAX_TRACES = 100,
51
52        // Insert 2 spaces when dumping the traces
53        DUMP_INDENT = 2,
54    };
55
56    CameraTraces();
57    ~CameraTraces();
58    CameraTraces(CameraTraces& rhs);
59
60    static CameraTracesImpl& sImpl;
61}; // class CameraTraces
62
63}; // namespace camera3
64}; // namespace android
65
66#endif // ANDROID_SERVERS_CAMERA_TRACES_H_
67