我正在使用Nodejs作为后端。我尝试了this npm包来创建一个简单的工作流程（AMAZON-SWF）。该软件包有一个示例文件夹，其中包含我放在节点项目中的文件，以便我了解它是如何工作的。
问题是Decider没有从SWF服务器接收任何任务。因为我的工作流程从未运行。有一些配置问题。请指出我做了哪些错误。
以下是快速参考的代码。代码唯一的变化是版本号更改和域名更改。否则，它与您可以找到here的代码相同。
以下是决策代码。
var swf = require('./index');
var myDecider = new swf.Decider({
"domain": "test-domain",
"taskList": {"name": "my-workflow-tasklist"},
"identity": "Decider-01",
"maximumPageSize": 100,
"reverseOrder": false // IMPORTANT: must replay events in the right order, ie. from the start
});
myDecider.on('decisionTask', function (decisionTask) {
console.log("Got a new decision task !");
if(!decisionTask.eventList.scheduled('step1')) {
decisionTask.response.schedule({
name: 'step1',
activity: 'simple-activity'
});
}
else {
decisionTask.response.stop({
result: "some workflow output data"
});
}
decisionTask.response.respondCompleted(decisionTask.response.decisions, function(err, result) {
if(err) {
console.log(err);
return;
}
console.log("responded with some data !");
});
});
myDecider.on('poll', function(d) {
//console.log(_this.config.identity + ": polling for decision tasks...");
console.log("polling for tasks...", d);
});
// Start polling
myDecider.start();
/**
* It is not recommanded to stop the poller in the middle of a long-polling request,
* because SWF might schedule an DecisionTask to this poller anyway, which will obviously timeout.
*
* The .stop() method will wait for the end of the current polling request,
* eventually wait for a last decision execution, then stop properly :
*/
process.on('SIGINT', function () {
console.log('Got SIGINT ! Stopping decider poller after this request...please wait...');
myDecider.stop();
});
以下是活动代码：
/**
* This simple worker example will respond to any incoming task
* on the 'my-workflow-tasklist, by setting the input parameters as the results of the task
*/
var swf = require('./index');
var activityPoller = new swf.ActivityPoller({
domain: 'test-domain-newspecies',
taskList: { name: 'my-workflow-tasklist' },
identity: 'simple-activity'
});
activityPoller.on('error',function() {
console.log('error');
});
activityPoller.on('activityTask', function(task) {
console.log("Received new activity task !");
var output = task.input;
task.respondCompleted(output, function (err) {
if(err) {
console.log(err);
return;
}
console.log("responded with some data !");
});
});
activityPoller.on('poll', function(d) {
console.log("polling for activity tasks...", d);
});
activityPoller.on('error', function(error) {
console.log(error);
});
// Start polling
activityPoller.start();
/**
* It is not recommanded to stop the poller in the middle of a long-polling request,
* because SWF might schedule an ActivityTask to this poller anyway, which will obviously timeout.
*
* The .stop() method will wait for the end of the current polling request,
* eventually wait for a last activity execution, then stop properly :
*/
process.on('SIGINT', function () {
console.log('Got SIGINT ! Stopping activity poller after this request...please wait...');
activityPoller.stop();
});
以下是注册的代码：
var awsswf = require('./index');
var swf = awsswf.createClient();
/**
* Register the domain "test-domain"
*/
swf.registerDomain({
name: "test-domain-newspecies",
description: "this is a just a test domain",
workflowExecutionRetentionPeriodInDays: "3"
}, function (err, results) {
if (err && err.code != 'DomainAlreadyExistsFault') {
console.log("Unable to register domain: ", err);
return;
}
console.log("'test-domain-newspecies' registered !")
/**
* Register the WorkflowType "simple-workflow"
*/
swf.registerWorkflowType({
domain: "test-domain-newspecies",
name: "simple-workflow",
version: "2.0"
}, function (err, results) {
if (err && err.code != 'TypeAlreadyExistsFault') {
console.log("Unable to register workflow: ", err);
return;
}
console.log("'simple-workflow' registered !")
/**
* Register the ActivityType "simple-activity"
*/
swf.registerActivityType({
domain: "test-domain-newspecies",
name: "simple-activity",
version: "2.0"
}, function (err, results) {
if (err && err.code != 'TypeAlreadyExistsFault') {
console.log("Unable to register activity type: ", err);
return;
}
console.log("'simple-activity' registered !");
});
});
});
以下是启动工作流程执行的代码：
var swf = require('./index');
var workflow = new swf.Workflow({
"domain": "test-domain-newspecies",
"workflowType": {
"name": "simple-workflow",
"version": "2.0"
},
"taskList": { "name": "my-workflow-tasklist" },
"executionStartToCloseTimeout": "1800",
"taskStartToCloseTimeout": "1800",
"tagList": ["example"],
"childPolicy": "TERMINATE"
});
var workflowExecution = workflow.start({ input: "any data ..."}, function (err, runId) {
if (err) { console.log("Cannot start workflow : ", err); return; }
console.log("Workflow started, runId: " +runId);
});
以下是index.js文件
var basePath = "../node_modules/aws-swf/lib/";
exports.AWS = require('aws-swf').AWS;
exports.AWS.config.loadFromPath(__dirname + '/../config/awsConfig.json');
exports.createClient = require(basePath+"swf").createClient;
exports.Workflow = require(basePath+"workflow").Workflow;
exports.WorkflowExecution = require(basePath+"workflow-execution").WorkflowExecution;
exports.ActivityPoller = require(basePath+"activity-poller").ActivityPoller;
exports.ActivityTask = require(basePath+"activity-task").ActivityTask;
exports.Decider = require(basePath+"decider").Decider;
exports.DecisionTask = require(basePath+"decision-task").DecisionTask;
exports.EventList = require(basePath+"event-list").EventList;
exports.DecisionResponse = require(basePath+"decision-response").DecisionResponse;
exports.Poller = require(basePath+"poller").Poller;
运行此代码的方法是同时打开三个终端。然后我在各自的终端执行以下命令。
activity
node <activity-file-name>
decider
node <decider-file-name>
start and register I run in the same terminal.
node <register-file-name>
node <start-file-name>
答案 0 :(得分：2)
在决策程序中，您使用的是"test-domain"，但在其余的代码中使用的是"test-domain-newspecies"。
如果域"test-domain"未注册，则在轮询决策任务时应收到UnknownResourceFault错误。