-
Notifications
You must be signed in to change notification settings - Fork 5
/
vertxbus.js
189 lines (165 loc) · 5.65 KB
/
vertxbus.js
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
/*
* Copyright 2011-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var vertx = vertx || {};
!function(factory) {
if (typeof define === "function" && define.amd) {
// Expose as an AMD module with SockJS dependency.
// "vertxbus" and "sockjs" names are used because
// AMD module names are derived from file names.
define("vertxbus", ["sockjs"], factory);
} else {
// No AMD-compliant loader
factory(SockJS);
}
}(function(SockJS) {
vertx.EventBus = function(url, options) {
var that = this;
var sockJSConn = new SockJS(url, undefined, options);
var handlerMap = {};
var replyHandlers = {};
var state = vertx.EventBus.CONNECTING;
that.onopen = null;
that.onclose = null;
that.send = function(address, message, replyHandler) {
sendOrPub("send", address, message, replyHandler)
}
that.publish = function(address, message, replyHandler) {
sendOrPub("publish", address, message, replyHandler)
}
that.registerHandler = function(address, handler) {
checkSpecified("address", 'string', address);
checkSpecified("handler", 'function', handler);
checkOpen();
var handlers = handlerMap[address];
if (!handlers) {
handlers = [handler];
handlerMap[address] = handlers;
// First handler for this address so we should register the connection
var msg = { type : "register",
address: address };
sockJSConn.send(JSON.stringify(msg));
} else {
handlers[handlers.length] = handler;
}
}
that.unregisterHandler = function(address, handler) {
checkSpecified("address", 'string', address);
checkSpecified("handler", 'function', handler);
checkOpen();
var handlers = handlerMap[address];
if (handlers) {
var idx = handlers.indexOf(handler);
if (idx != -1) handlers.splice(idx, 1);
if (handlers.length == 0) {
// No more local handlers so we should unregister the connection
var msg = { type : "unregister",
address: address};
sockJSConn.send(JSON.stringify(msg));
delete handlerMap[address];
}
}
}
that.close = function() {
checkOpen();
state = vertx.EventBus.CLOSING;
sockJSConn.close();
}
that.readyState = function() {
return state;
}
sockJSConn.onopen = function() {
state = vertx.EventBus.OPEN;
if (that.onopen) {
that.onopen();
}
};
sockJSConn.onclose = function() {
state = vertx.EventBus.CLOSED;
if (that.onclose) {
that.onclose();
}
};
sockJSConn.onmessage = function(e) {
var msg = e.data;
var json = JSON.parse(msg);
var body = json.body;
var replyAddress = json.replyAddress;
var address = json.address;
var replyHandler;
if (replyAddress) {
replyHandler = function(reply, replyHandler) {
// Send back reply
that.send(replyAddress, reply, replyHandler);
};
}
var handlers = handlerMap[address];
if (handlers) {
// We make a copy since the handler might get unregistered from within the
// handler itself, which would screw up our iteration
var copy = handlers.slice(0);
for (var i = 0; i < copy.length; i++) {
copy[i](body, replyHandler);
}
} else {
// Might be a reply message
var handler = replyHandlers[address];
if (handler) {
delete replyHandlers[replyAddress];
handler(body, replyHandler);
}
}
}
function sendOrPub(sendOrPub, address, message, replyHandler) {
checkSpecified("address", 'string', address);
checkSpecified("message", 'object', message);
checkSpecified("replyHandler", 'function', replyHandler, true);
checkOpen();
var envelope = { type : sendOrPub,
address: address,
body: message };
if (replyHandler) {
var replyAddress = makeUUID();
envelope.replyAddress = replyAddress;
replyHandlers[replyAddress] = replyHandler;
}
var str = JSON.stringify(envelope);
sockJSConn.send(str);
}
function checkOpen() {
if (state != vertx.EventBus.OPEN) {
throw new Error('INVALID_STATE_ERR');
}
}
function checkSpecified(paramName, paramType, param, optional) {
if (!optional && !param) {
throw new Error("Parameter " + paramName + " must be specified");
}
if (param && typeof param != paramType) {
throw new Error("Parameter " + paramName + " must be of type " + paramType);
}
}
function isFunction(obj) {
return !!(obj && obj.constructor && obj.call && obj.apply);
}
function makeUUID(){return"xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx"
.replace(/[xy]/g,function(a,b){return b=Math.random()*16,(a=="y"?b&3|8:b|0).toString(16)})}
}
vertx.EventBus.CONNECTING = 0;
vertx.EventBus.OPEN = 1;
vertx.EventBus.CLOSING = 2;
vertx.EventBus.CLOSED = 3;
return vertx.EventBus;
});