1 /*
2  * Copyright (C) 2006 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_BUFFEREDTEXTOUTPUT_H
18 #define ANDROID_BUFFEREDTEXTOUTPUT_H
19 
20 #include <binder/TextOutput.h>
21 #include <utils/threads.h>
22 #include <sys/uio.h>
23 
24 // ---------------------------------------------------------------------------
25 namespace android {
26 
27 class BufferedTextOutput : public TextOutput
28 {
29 public:
30     //** Flags for constructor */
31     enum {
32         MULTITHREADED = 0x0001
33     };
34 
35     explicit            BufferedTextOutput(uint32_t flags = 0);
36     virtual             ~BufferedTextOutput();
37 
38     virtual status_t    print(const char* txt, size_t len);
39     virtual void        moveIndent(int delta);
40 
41     virtual void        pushBundle();
42     virtual void        popBundle();
43 
44 protected:
45     virtual status_t    writeLines(const struct iovec& vec, size_t N) = 0;
46 
47 private:
48     struct BufferState;
49     struct ThreadState;
50 
51     static  ThreadState*getThreadState();
52     static  void        threadDestructor(void *st);
53 
54             BufferState*getBuffer() const;
55 
56     uint32_t            mFlags;
57     const int32_t       mSeq;
58     const int32_t       mIndex;
59 
60     Mutex               mLock;
61     BufferState*        mGlobalState;
62 };
63 
64 // ---------------------------------------------------------------------------
65 } // namespace android
66 
67 #endif // ANDROID_BUFFEREDTEXTOUTPUT_H
68