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node-red/red/runtime/nodes/context.js
2016-06-11 22:53:27 +01:00

82 lines
2.1 KiB
JavaScript

/**
* Copyright 2015, 2016 IBM Corp.
*
* 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 clone = require("clone");
var when = require("when");
var util = require("../util");
function createContext(id,seed) {
var data = seed || {};
var obj = seed || {};
obj.get = function get(key) {
return util.getMessageProperty(data,key);
};
obj.set = function set(key, value) {
util.setMessageProperty(data,key,value);
}
return obj;
}
var contexts = {};
var globalContext = null;
function getContext(localId,flowId) {
var contextId = localId;
if (flowId) {
contextId = localId+":"+flowId;
}
if (contexts[contextId]) {
return contexts[contextId];
}
var newContext = createContext(contextId);
if (flowId) {
newContext.flow = getContext(flowId);
if (globalContext) {
newContext.global = globalContext;
}
}
contexts[contextId] = newContext;
return newContext;
}
function deleteContext(id,flowId) {
var contextId = id;
if (flowId) {
contextId = id+":"+flowId;
}
delete contexts[contextId];
}
function clean(flowConfig) {
var activeIds = {};
var contextId;
var node;
for (var id in contexts) {
if (contexts.hasOwnProperty(id)) {
var idParts = id.split(":");
if (!flowConfig.allNodes[idParts[0]]) {
delete contexts[id];
}
}
}
}
module.exports = {
init: function(settings) {
globalContext = createContext("global",settings.functionGlobalContext || {});
},
get: getContext,
delete: deleteContext,
clean:clean
};