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Introduction

The Fews Workflow Runner service uses XFire, a java SOAP framework. This framework allows a client application to obtain a proxy instance to the FewsWebServiceRunner API. With this API the client can run workflows on the MC from the client code. The timeseries produced by the workflow run can read by the client application. Before a client application can access the FEWS system there is some configuration work that needs to be done.

User's looking to use XFire on a new project, should use CXF instead. CXF is a continuation of the XFire project and is considered XFire 2.0. It has many new features, a ton of bug fixes, and is now JAX-WS compliant! XFire will continue to be maintained through bug fix releases, but most development will occur on CXF now. For more information see the XFire/Celtix merge FAQ and the CXF website.

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Description of the methods provided by the Fews Workflow Runner Service API.

TimeSeries[] runFewsWorkflow(String clientId, String workflowId, Date forecastStartDateTime,
                 Date forecastDateTime0, Date forecastEndDateTime, TimeSeries[] inputTimeSeries)
                 throws Exception;

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The MC Service component is started up by the MC (TaskWebServiceRunner). The client application does not use this service directly. The only configuration required for this component is that the following line is added to the MC configuration file; fews.master.mc.conf.

<webservice port="8899" sleeptime="15" timeout="600"/> 

Installing the Workflow Runner

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The Workflow Runner component is started up by the client application (see Examples). This service requires a configuration file that is an instance of the WebService.xsd.

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Example of a WebService xml file.

Starting on Windows

Step 1: Install the webservice package.TODO: Attach the webservice package!

Step 2: Make a new FewsWebService.exe and FewsWebService.jpif file in the \bin directory. The FewsWebService.jpif must contain the following information.

Code Block
..\jre -mx512m -cp $JARS_PATH$ nl.wldelft.fews.webservice.FewsWebServiceRunner <path>/WebService.xml

Step 4: Start the FewsWebServiceRunner by clicking on the FewsWebServiceRunner.exe.

Step 5: Stop the FewsWebServiceRunner by killing the application using the System Monitor.

Install windows service

TODO: Package not available!

Starting on Linux

Step 1: Install the webservice package.TODO: Attach the webservice package!

Step 2: Set the correct paths in the fews_webservice.sh script.

Step 3: Start the fews_webservice.sh script by typing ./fews_webservice.sh start

Step 4: To stop the service type ./fews_webservice.sh stop

To make sure that the service keeps running there is also a 'watcher' script. This script should be run as a cron job. What this script does is, check if the web fews webservice script is still running. If the service is not running the it is restarted.

Example code

Here are some examples of how a client application would instantiate a FewsWebService and fire of a workflow to the MC.

Before starting the client will require the following library: xfire-all-1.2.5.jar. This library can be found in the bin directory of the FEWS system.

Setting up a connection

ObjectServiceFactory serviceFactory = new ObjectServiceFactory();
Service service = serviceFactory.create(FewsWebService.class);
XFireProxyFactory proxyFactory = new XFireProxyFactory();
 //port Number must be equal to the number configured in the WebService.xml
int portNumber = 8100;
//localhost can be replaced by the ip address of the machine on which the WebService is running.
FewsWebService serviceProxy = (FewsWebService) proxyFactory.create(service, "http://localhost:" + portNumber + "/FewsWebService")

Running Workflows

FewsWebService proxy = getProxy(); //See section "Setting up a connection"

TimeSeries[] inputArrays = getInputArrays(); //Get the timeseries required to run workflow.

//Run a workflow
try {
TimeSeries[] outputArrays = proxy.runFewsWorkflow("MyWebService", "workflowId", new Date(0), new Date(0), new Date(0), inputArrays);
} catch (Exception e){
// do something.
}

Appendix

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