1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2004-2012. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
import java.io.UnsupportedEncodingException;
import java.util.HashSet;
import com.ericsson.otp.erlang.OtpErlangAtom;
import com.ericsson.otp.erlang.OtpErlangBinary;
import com.ericsson.otp.erlang.OtpErlangBoolean;
import com.ericsson.otp.erlang.OtpErlangException;
import com.ericsson.otp.erlang.OtpErlangInt;
import com.ericsson.otp.erlang.OtpErlangList;
import com.ericsson.otp.erlang.OtpErlangLong;
import com.ericsson.otp.erlang.OtpErlangObject;
import com.ericsson.otp.erlang.OtpErlangPid;
import com.ericsson.otp.erlang.OtpErlangString;
import com.ericsson.otp.erlang.OtpErlangTuple;
import com.ericsson.otp.erlang.OtpExternal;
import com.ericsson.otp.erlang.OtpInputStream;
import com.ericsson.otp.erlang.OtpMbox;
import com.ericsson.otp.erlang.OtpNode;
import com.ericsson.otp.erlang.OtpOutputStream;
public class echo_server {
private static boolean debug = false;
public static void main(final String[] argv) {
try {
System.out.println("echo_server booting...");
for (int j = 0; j < argv.length; j++) {
System.out.println("argv[" + j + "] = \"" + argv[j] + "\"");
}
if (argv.length != 4 && argv.length != 5) {
System.out.println("Wrong number of arguments!");
System.exit(1);
}
// Start node and mbox
final OtpNode node = new OtpNode(argv[0], argv[1]);
if (argv.length == 5 && argv[4].equals("unicode")) {
System.out.println("Setting unicode string mode.");
node.setFlags(OtpInputStream.DECODE_INT_LISTS_AS_STRINGS);
}
final OtpMbox mbox = node.createMbox();
// Announce our presence
final OtpErlangObject[] amsg = new OtpErlangObject[3];
amsg[0] = new OtpErlangAtom("echo_server");
amsg[1] = new OtpErlangAtom(argv[0]);
amsg[2] = mbox.self();
final OtpErlangTuple atuple = new OtpErlangTuple(amsg);
mbox.send(argv[3], argv[2], atuple);
// Do echoing...
while (true) {
final OtpErlangObject o = mbox.receive();
if (o == null) {
continue;
}
if (o instanceof OtpErlangTuple) {
final OtpErlangTuple msg = (OtpErlangTuple) o;
final int arity = msg.arity();
if (arity < 2) {
System.out
.println("Arity < 2; echo_server aborting...");
System.exit(2);
} else if (arity == 2) {
final OtpErlangPid from = (OtpErlangPid) msg
.elementAt(0);
if (debug) System.out.println("Echoing: "
+ msg.elementAt(1));
final OtpErlangObject[] rmsg = new OtpErlangObject[2];
rmsg[0] = mbox.self();
rmsg[1] = msg.elementAt(1);
final OtpErlangTuple rtuple = new OtpErlangTuple(rmsg);
mbox.send(from, rtuple);
continue;
} else if (arity == 3) {
echoTwisted(mbox, msg);
continue;
} else {
System.out
.println("Arity > 3; echo_server aborting...");
System.exit(2);
}
} else if (o instanceof OtpErlangAtom) {
OtpErlangAtom a = (OtpErlangAtom) o;
if (a.atomValue().equals("debug")) {
debug = true;
} else if (a.atomValue().equals("bye")) {
System.out.println("echo_server halting...");
System.exit(0);
}
} else { // probably 'bye'
}
System.out.println("Unexpected: " + o +
" echo_server aborting...");
System.exit(2);
}
} catch (final Exception e) {
System.out.println("" + e);
System.exit(2);
}
}
private static void echoTwisted(final OtpMbox mbox,
final OtpErlangTuple msg)
throws OtpErlangException {
final OtpErlangPid from = (OtpErlangPid) msg.elementAt(0);
final OtpErlangObject[] rmsg = new OtpErlangObject[3];
if (debug) System.out.println("Echo in: " + msg);
rmsg[0] = mbox.self();
rmsg[1] = twist(msg.elementAt(1), rmsg[2] = msg.elementAt(2));
final OtpErlangTuple rtuple = new OtpErlangTuple(rmsg);
if (debug) System.out.println("Echo out: " + rtuple);
mbox.send(from, rtuple);
}
private static HashSet<OtpErlangObject> hash_set =
new HashSet<OtpErlangObject>();
private static OtpErlangObject twist(final OtpErlangObject i,
final OtpErlangObject t) throws OtpErlangException {
hash_set.add(i);
if (t instanceof OtpErlangAtom) {
final String atomValue = ((OtpErlangAtom) t).atomValue();
if (atomValue.equals("binary") && i instanceof OtpErlangBinary) {
final OtpErlangBinary b = (OtpErlangBinary) i;
final OtpInputStream bis = new OtpInputStream(b.binaryValue(),
0);
final OtpErlangObject o = bis.read_any();
return o;
} else if (atomValue.equals("compress")) {
final OtpOutputStream oos = new OtpOutputStream();
oos.write1(OtpExternal.versionTag);
oos.write_compressed(i);
final OtpErlangBinary o =
new OtpErlangBinary(oos.toByteArray());
return o;
} else if (atomValue.equals("bigint")
&& i instanceof OtpErlangLong) {
final OtpErlangLong l = (OtpErlangLong) i;
final int w = l.signum() * l.bitLength();
final OtpErlangLong x = new OtpErlangLong(l.longValue());
final java.math.BigInteger b = l.bigIntegerValue();
System.out.println("long: " + l + ": " + w + ": " + b.signum()
* b.bitLength() + ": " + x + ": " + l.isLong() + ": "
+ l.isULong());
return new OtpErlangTuple(new OtpErlangObject[] { l,
new OtpErlangInt(w), x,
new OtpErlangInt(l.isLong() ? 1 : 0),
new OtpErlangInt(l.isULong() ? 1 : 0) });
} else if (atomValue.equals("tail")
&& i instanceof OtpErlangList) {
final OtpErlangObject o = ((OtpErlangList) i).getTail();
if (o == null) {
return new OtpErlangAtom("null");
}
return o;
} else if (atomValue.equals("tail3")
&& i instanceof OtpErlangList) {
final OtpErlangObject o = ((OtpErlangList) i).getNthTail(3);
if (o == null) {
return new OtpErlangAtom("null");
}
return o;
} else if (atomValue.equals("strcat")
&& i instanceof OtpErlangList) {
final java.lang.StringBuffer b = new java.lang.StringBuffer();
final OtpErlangList l = (OtpErlangList) i;
for (final OtpErlangObject j : l) {
final OtpErlangString k = (OtpErlangString) j;
b.append(k.stringValue());
}
final OtpErlangObject o = new OtpErlangString(b.toString());
return o;
} else if (atomValue.equals("sub3atom")
&& i instanceof OtpErlangString) {
final OtpErlangString s = (OtpErlangString) i;
final OtpErlangAtom o = new OtpErlangAtom(s.stringValue()
.substring(3));
return o;
} else if (atomValue.equals("codepointBug")
&& i instanceof OtpErlangString) {
final OtpErlangString s = (OtpErlangString) i;
final String ss = s.stringValue().substring(3, 6);
final int[] cps = OtpErlangString.stringToCodePoints(ss);
return s;
} else if (atomValue.equals("utf8")) {
if (i instanceof OtpErlangString) {
final OtpErlangString s = (OtpErlangString) i;
byte[] bytes;
try {
bytes = s.stringValue().getBytes("UTF-8");
} catch (final UnsupportedEncodingException e) {
bytes = new byte[] { 'e', 'r', 'r', 'o', 'r' };
}
final OtpErlangBinary b = new OtpErlangBinary(bytes);
return b;
}
} else if(atomValue.equals("to_string_neg_int_list")) {
OtpErlangString oes = null;
if (i instanceof OtpErlangString) {
oes = (OtpErlangString) i;
} else if (i instanceof OtpErlangList) {
OtpErlangList oel = (OtpErlangList) i;
try {
oes = new OtpErlangString(oel);
} catch (final Exception e) {
}
}
if (oes != null) {
String s = oes.stringValue();
int n = s.length();
OtpErlangObject l[] = new OtpErlangObject[n];
for (int j = 0; j < n; j++) {
int c = s.charAt(j);
l[j] = new OtpErlangInt(-c);
}
return new OtpErlangList(l);
}
} else if(atomValue.equals("to_neg_int_list")) {
if (i instanceof OtpErlangString) {
OtpErlangString oes = (OtpErlangString) i;
OtpErlangList oel = new OtpErlangList(oes.stringValue());
int n = oel.arity();
OtpErlangObject l[] = new OtpErlangObject[n];
for (int j = 0; j < n; j++) {
OtpErlangLong c = (OtpErlangLong) oel.elementAt(j);
l[j] = new OtpErlangInt(-c.intValue());
}
return new OtpErlangList(l);
}
} else if (atomValue.equals("hash_lookup")) {
final boolean exists = hash_set.contains(i);
final OtpErlangBoolean b = new OtpErlangBoolean(exists);
return b;
} else if (atomValue.equals("hash_clear")) {
hash_set.clear();
return new OtpErlangAtom("hash_cleared");
}
}
return i;
}
}
|
