XML processing and creating a resource in parallel in Java

Question

I am writing a app, which has to create multiple Resources. The input is a XML. I need to parse the XML, create the Resources in parallel and update the responses in the Ouputs.

<Components>
    <Resources>
        <CreateResourceARequest> ...</CreateResourceARequest>
        <CreateResourceBRequest>...</CreateResourceBRequest>
        <CreateResourceCRequest>...</CreateResourceCRequest>
    </Resources>
    <Outputs>
        <CreateResourceAResponse>...</CreateResourceAResponse>
        <CreateResourceBResponse>...</CreateResourceBResponse>
        <CreateResourceCResponse>...</CreateResourceCResponse>
    </Outputs>
<Components>

Each of the ResourceRequests are handled by a specific Classes.

What is the best way to create Resources in parallel, aggregate the results and update the xml ?

I'm sorry, but what do you mean by "in parallel" here?

Hovercraft Full Of Eels
– Hovercraft Full Of Eels

2011-07-04 16:13:05 +00:00
Commented Jul 4, 2011 at 16:13 — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Jul 4, 2011 at 16:13

Penkov Vladimir · Accepted Answer · 2011-07-04 17:32:02Z

1

you will parse xml file in single thread anyway because the file is linear. but you can collect you parsers for each CreateResourceCRequest in a set and start them all in parallel threads after parsing file

answered Jul 4, 2011 at 17:32

Penkov Vladimir

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2 Comments

Santhosh S Over a year ago

sometimes I need to ensure that a resource needs to be created before other resources are created. How do I ensure that ?

Santhosh S Over a year ago

exec = Executors.newCachedThreadPool(); exec.execute(new CreateResourceA(input)); exec.execute(new CreateResourceB(input)); exec.execute(new CreateResourceB(input)); exec.shutdown(); while (!exec.isTerminated()){ logger.debug("some tasks are still running"); } ----- currently I am doing it this way, but this does not ensure ResourceA to be created before ResourceB.

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