An asynchronous callback object that manages timeouts

I have created an object that helps clients to XmlRpcClient impose a timeout value onto a call to send an XML-RPC message.

I want to propose that this callback object be added to the XML-RPC codebase. Feel free to change the name of the class or any of its variables or methods.

Here is example client code for the class:

TimingOutAsyncCallback callback = new TimingOutAsyncCallback(10000);
XmlRpcClient client = new XmlRpcClient(url);
client.executeAsync(methodName, aVector, callback);
callback.waitForResponse();
if (callback.getException() != null) {
throw callback.getException();
}
Object result = callback.getResult();

Here is the code for TimingOutAsyncCallback:

/**

• A callback object that can wait up to a specified amount
• of time for the XML-RPC response.
  */
  protected class TimingOutAsyncCallback implements AsyncCallback {

private long timeout = 10 * 1000; // default to 10 seconds
private Object result;
private Exception exception;

public TimingOutAsyncCallback()

{ super(); }

public TimingOutAsyncCallback(long timeout)

{ this.timeout = timeout; }

public void setTimeout(long timeout) { this.timeout = timeout; }

public long getTimeout()

{ return this.timeout; }

public Object getResult()

{ return this.result; }

public Exception getException()

{ return this.exception; }

public synchronized void handleError(Exception exception, URL url, String method)

{ this.exception = exception; this.notify(); }

public synchronized void handleResult(Object result, URL url, String method)

{ this.result = result; this.notify(); }

public synchronized void waitForResponse() throws InterruptedException

{ this.wait(timeout); }

}

Please comment if you have any questions or comments.