Asynchronous request with Thrift in Java

Question

I'm looking for an example of how to make an asynchronous request in Java using Thrift. Looking at the generated code this seems to be possible, but I can't find a single example of how.

Here is an example of generated code that suggest the existence of an Asynchronous interface:

...
AsyncIface {
    public static class Factory implements org.apache.thrift.async.TAsyncClientFactory<AsyncClient> {
      private org.apache.thrift.async.TAsyncClientManager clientManager;
      private org.apache.thrift.protocol.TProtocolFactory protocolFactory;
      public Factory(org.apache.thrift.async.TAsyncClientManager clientManager, org.apache.thrift.protocol.TProtocolFactory protocolFactory) {
        this.clientManager = clientManager;
        this.protocolFactory = protocolFactory;
      }
      public AsyncClient getAsyncClient(org.apache.thrift.transport.TNonblockingTransport transport) {
        return new AsyncClient(protocolFactory, clientManager, transport);
      }
    }
 ...

Any pointer on how to use it?

score 9 · Accepted Answer · answered Jan 10 '12 at 13:11

Use the above interface to make the async call like this (The code mentions Cassandra but will easily generalize to your application):

TNonblockingTransport transport = new TNonblockingSocket("127.0.0.1", 9160);
TAsyncClientManager clientManager = new TAsyncClientManager();
TProtocolFactory protocolFactory = new TBinaryProtocol.Factory();
Cassandra.AsyncClient client = new Cassandra.AsyncClient(protocolFactory, clientManager, transport);

Cassandra.method_call(parameters, new Callback());

score 1 · Answer 2 · answered Sep 19 '11 at 03:56

1

You haven't given any context, so I'll give you the basic parts you'll need:

To perform an asynchronous call, you'll need make it in a thread
To get the result, you'll need some kind of call back

The following represents a basic example of these elements in play:

final MyClient client;  // Who will get a call back to the their sendResult() method when asynch call finished
ExecutorService executor = Executors.newSingleThreadExecutor(); // Handy way to run code in a thread
Runnable task = new Runnable() { 
    public void run() { // Where the "do the call" code sits
        int result = someService.call(someParamter);
        client.sendResult(result); // For example, expecting an int result
    }
};
executor.submit(task); // This scheduled the runnable to be run

answered Sep 19 '11 at 03:56

Bohemian

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2

This is would be a way to do it, but it seems that Thrift generates code specifically meant to implement an asynchronous client. I've edited my question to make it a bit clearer. – MasterScrat Nov 05 '11 at 21:56
5

@Bohemian, I know you were trying to help, but those "working examples" are for a synchronous client, not async. And the linked Wiki article is even less useful. – Andrew Swan Mar 15 '12 at 10:07
yes, this defeats our purpose as well. We found in simulation our request time went from 30 seconds to 3 seconds on 100k rows in a file upload if we simulate an async version so we don't hold up threads in our system. – Dean Hiller Apr 16 '13 at 19:26

Asynchronous request with Thrift in Java

2 Answers2