15
SOAP and Web Services
Using SOAP and Web Services
Asynchronous Web Service Calls
The
SOAP
object’s
request
method may be used in conjunction with the
response
method to establish asynchronous communication with a web service. In this case, the
request
method calls a method on the notification object, and does not return a value.
Asynchronous communication is made possible by assigning a value to the
request
method’s
aSync
parameter, which is an object literal that must contain a function called
response
that accepts two parameters:
oResult
(the result object) and
cURI
(the URI
of the requested HTTP endpoint).
In the example below, the
aSync
parameter named
mySync
contains an attribute called
isDone
, which is used to monitor the status of the web service call, and an attribute called
val
which will contain the result of the web service call. When the
response
function is
called by the web service, it sets
isDone
to
true
indicating that the asynchronous call has
been completed:
// Create the aSync parameter:
var mySync = {
isDone: false,
val: null,
// Generates the result of the web method:
result: function(cMethod)
{
this.isDone = false;
var name = "http://mydomain/methods/:" + cMethod + "Response";
if (typeof this.val[name] == "undefined")
return null;
else
return this.val[name]["return"];
},
// The method called by the web service after completion:
response: function(oResult, cURI)
{
this.val = oResult;
this.isDone = true;
},
// While the web service is not done, do something else:
wait: function()
{
while (!this.isDone) doSomethingElse();
}
};
250
Acrobat JavaScript Scripting Guide
Pages: Index 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280