Android中java层使用LocalSocket和底层进行通讯

原始文件：frameworks\base\services\java\com\android\server\NativeDaemonConnector.java

1. private
   void listenToSocket() throws IOException {
2.     LocalSocket socket = null;
3.  
4.     try {
5.         socket = new LocalSocket();
6.         LocalSocketAddress address = new LocalSocketAddress(mSocket,
7.                 LocalSocketAddress.Namespace.RESERVED);
8.  
9.         socket.connect(address);
10.  
11.         InputStream inputStream = socket.getInputStream();
12.         mOutputStream = socket.getOutputStream();
13.  
14.         mCallbacks.onDaemonConnected();
15.  
16.         byte[] buffer = new
    byte[BUFFER_SIZE];
17.         int start = 0;
18.  
19.         while (true) {
20.             int count = inputStream.read(buffer, start, BUFFER_SIZE - start);
21.             if (count < 0) break;
22.  
23.             // Add our starting point to the count and reset the start.
24.             count += start;
25.             start = 0;
26.  
27.             for (int i = 0; i < count; i++) {
28.                 if (buffer[i] == 0) {
29.                     String event = new String(buffer, start, i - start);
30.                     if (LOCAL_LOGD) Slog.d(TAG, String.format("RCV <- {%s}", event));
31.  
32.                     String[] tokens = event.split("
    ", 2);
33.                     try {
34.                         int code = Integer.parseInt(tokens[0]);
35.  
36.                         if (code >= ResponseCode.UnsolicitedInformational) {
37.                             mCallbackHandler.sendMessage(
38.                                     mCallbackHandler.obtainMessage(code, event));
39.                         } else {
40.                             try {
41.                                 mResponseQueue.put(event);
42.                             } catch (InterruptedException ex) {
43.                                 Slog.e(TAG, "Failed to put response onto queue", ex);
44.                             }
45.                         }
46.                     } catch (NumberFormatException nfe) {
47.                         Slog.w(TAG, String.format("Bad msg (%s)", event));
48.                     }
49.                     start = i + 1;
50.                 }
51.             }
52.  
53.             // We should end at the amount we read. If not, compact then
54.             // buffer and read again.
55.             if (start != count) {
56.                 final
    int remaining = BUFFER_SIZE - start;
57.                 System.arraycopy(buffer, start, buffer, 0, remaining);
58.                 start = remaining;
59.             } else {
60.                 start = 0;
61.             }
62.         }
63.     } catch (IOException ex) {
64.         Slog.e(TAG, "Communications error", ex);
65.         throw ex;
66.     } finally {
67.         synchronized (mDaemonLock) {
68.             if (mOutputStream != null) {
69.                 try {
70.                     mOutputStream.close();
71.                 } catch (IOException e) {
72.                     Slog.w(TAG, "Failed closing output stream", e);
73.                 }
74.                 mOutputStream = null;
75.             }
76.         }
77.  
78.         try {
79.             if (socket != null) {
80.                 socket.close();
81.             }
82.         } catch (IOException ex) {
83.             Slog.w(TAG, "Failed closing socket", ex);
84.         }
85.     }
86. }