Cache of DescribeProcess responses on the client.

lib/OpenLayers/WPSClient.js

@@ -18,8 +18,9 @@ OpenLayers.WPSClient = OpenLayers.Class({
      *
      * Properties:
      * url - {String} the url of the server
-     * knownProcesses: {Object} Cache of DescribeProcess responses, keyed by
-     *     process identifier.
+     * version - {String} WPS version of the server
+     * describeProcessResponse - {Object} Cache of DescribeProcess responses,
+     *     keyed by process identifier.
      */
     servers: null,
     
@@ -61,7 +62,8 @@ OpenLayers.WPSClient = OpenLayers.Class({
         for (var s in options.servers) {
             this.servers[s] = typeof options.servers[s] == 'string' ? {
                 url: options.servers[s],
-                version: '1.0.0'
+                version: '1.0.0',
+                describeProcessResponse: {}
             } : options.servers[s];
         }
     },

lib/OpenLayers/WPSProcess.js

@@ -84,15 +84,23 @@ OpenLayers.WPSProcess = OpenLayers.Class({
     /**
      * Method: describe
      * Issues a DescribeProcess request asynchronously and fires the
-     * 'describeProcess' event as soon as the response is available in
+     * 'describeprocess' event as soon as the response is available in
      * <description>.
      */
     describe: function() {
-        if (this._describePending || this.description) {
+        var server = this.client.servers[this.server];
+        if (this.description !== null) {
+            return;
+        } else if (server.describeProcessResponse[this.identifier] === null) {
+            // pending request
+            return;
+        } else if (this.identifier in server.describeProcessResponse) {
+            // process description already cached on client
+            this.parseDescription();
             return;
         }
-        this._describePending = true;
-        var server = this.client.servers[this.server];
+        // set to null so we know a describeFeature request is pending
+        server.describeProcessResponse[this.identifier] = null;
         OpenLayers.Request.GET({
             url: server.url,
             params: {
@@ -101,13 +109,7 @@ OpenLayers.WPSProcess = OpenLayers.Class({
                 REQUEST: 'DescribeProcess',
                 IDENTIFIER: this.identifier
             },
-            success: function(response) {
-                this.description = new OpenLayers.Format.WPSDescribeProcess()
-                    .read(response.responseText)
-                    .processDescriptions[this.identifier];
-                delete this._describePending;
-                this.events.triggerEvent('describeprocess');
-            },
+            success: this.parseDescription,
             scope: this
         });
     },
@@ -165,6 +167,23 @@ OpenLayers.WPSProcess = OpenLayers.Class({
         });
     },
     
+    /**
+     * Method: parseDescription
+     *
+     * Parameters:
+     * response - {Object}
+     */
+    parseDescription: function(response) {
+        var server = this.client.servers[this.server];
+        if (response) {
+            server.describeProcessResponse[this.identifier] = response.responseText;
+        }
+        this.description = new OpenLayers.Format.WPSDescribeProcess()
+            .read(server.describeProcessResponse[this.identifier])
+            .processDescriptions[this.identifier];
+        this.events.triggerEvent('describeprocess');
+    },
+    
     /**
      * Method: setInputData
      * Sets the data for a single input