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ce0974c4 NR |
1 | package be.nikiroo.utils.serial; |
2 | ||
3 | import java.io.BufferedReader; | |
4 | import java.io.IOException; | |
5 | import java.io.InputStreamReader; | |
6 | import java.io.OutputStreamWriter; | |
7 | import java.net.Socket; | |
8 | ||
9 | import be.nikiroo.utils.Version; | |
10 | ||
11 | abstract class ConnectAction { | |
12 | private Socket s; | |
13 | private boolean server; | |
14 | private Version version; | |
15 | ||
16 | private Object lock = new Object(); | |
17 | private BufferedReader in; | |
18 | private OutputStreamWriter out; | |
19 | private boolean contentToSend; | |
20 | ||
21 | // serverVersion = null on server (or bad clients) | |
22 | abstract public void action(Version serverVersion) throws Exception; | |
23 | ||
24 | // server = version NULL | |
25 | protected ConnectAction(Socket s, boolean server, Version version) { | |
26 | this.s = s; | |
27 | this.server = server; | |
28 | ||
29 | if (version == null) { | |
30 | this.version = new Version(); | |
31 | } else { | |
32 | this.version = version; | |
33 | } | |
34 | } | |
35 | ||
36 | public void connectAsync() { | |
37 | new Thread(new Runnable() { | |
38 | public void run() { | |
39 | connect(); | |
40 | } | |
41 | }).start(); | |
42 | } | |
43 | ||
44 | public void connect() { | |
45 | try { | |
46 | in = new BufferedReader(new InputStreamReader(s.getInputStream(), | |
47 | "UTF-8")); | |
48 | try { | |
49 | out = new OutputStreamWriter(s.getOutputStream(), "UTF-8"); | |
50 | try { | |
51 | if (server) { | |
52 | action(version); | |
53 | } else { | |
54 | String v = sendString("VERSION " + version.toString()); | |
55 | if (v != null && v.startsWith("VERSION ")) { | |
56 | v = v.substring("VERSION ".length()); | |
57 | } | |
58 | ||
59 | action(new Version(v)); | |
60 | } | |
61 | } finally { | |
62 | out.close(); | |
63 | } | |
64 | } finally { | |
65 | in.close(); | |
66 | } | |
67 | } catch (Exception e) { | |
68 | onError(e); | |
69 | } finally { | |
70 | try { | |
71 | s.close(); | |
72 | } catch (Exception e) { | |
73 | onError(e); | |
74 | } | |
75 | } | |
76 | } | |
77 | ||
78 | // (also, server never get anything) | |
79 | public Object send(Object data) throws IOException, NoSuchFieldException, | |
80 | NoSuchMethodException, ClassNotFoundException { | |
81 | synchronized (lock) { | |
82 | String rep = sendString(new Exporter().append(data).toString(true)); | |
83 | return new Importer().read(rep).getValue(); | |
84 | } | |
85 | } | |
86 | ||
87 | public Object flush() throws NoSuchFieldException, NoSuchMethodException, | |
88 | ClassNotFoundException, IOException, java.lang.NullPointerException { | |
89 | String str = flushString(); | |
90 | if (str == null) { | |
91 | throw new NullPointerException("No more data from client"); | |
92 | } | |
93 | ||
94 | return new Importer().read(str).getValue(); | |
95 | } | |
96 | ||
97 | protected void onClientVersionReceived(Version clientVersion) { | |
98 | ||
99 | } | |
100 | ||
101 | protected void onError(Exception e) { | |
102 | ||
103 | } | |
104 | ||
105 | // \n included in line, but not in rep (also, server never get anything) | |
106 | private String sendString(String line) throws IOException { | |
107 | synchronized (lock) { | |
108 | out.write(line); | |
109 | out.write("\n"); | |
110 | ||
111 | if (server) { | |
112 | out.flush(); | |
113 | return null; | |
114 | } else { | |
115 | contentToSend = true; | |
116 | return flushString(); | |
117 | } | |
118 | } | |
119 | } | |
120 | ||
121 | // server can receive something even without pending content | |
122 | private String flushString() throws IOException { | |
123 | synchronized (lock) { | |
124 | if (server || contentToSend) { | |
125 | if (contentToSend) { | |
126 | out.flush(); | |
127 | contentToSend = false; | |
128 | } | |
129 | ||
130 | String line = in.readLine(); | |
131 | if (server && line != null && line.startsWith("VERSION ")) { | |
132 | // "VERSION client-version" (VERSION 1.0.0) | |
133 | Version clientVersion = new Version( | |
134 | line.substring("VERSION ".length())); | |
135 | onClientVersionReceived(clientVersion); | |
136 | sendString("VERSION " + version.toString()); | |
137 | ||
138 | line = in.readLine(); | |
139 | } | |
140 | ||
141 | return line; | |
142 | } else { | |
143 | return null; | |
144 | } | |
145 | } | |
146 | } | |
147 | } |