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      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 
     24 namespace android {
     25 namespace camera3 {
     26 
     27 class CameraTracesImpl;
     28 
     29 // Collect a list of the process's stack traces
     30 class CameraTraces {
     31 public:
     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 
     47 private:
     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