@Override
  public boolean hasResult() {
    return true;
  }
Specifies whether the function sends results while executing. The method returns false if no
result is expected.<br>
<p>
If {@link Function#hasResult()} returns false, {@link ResultCollector#getResult()} throws
{@link FunctionException}.
<p>
If {@link Function#hasResult()} returns true, {@link ResultCollector#getResult()} blocks and
waits for the result of function execution
<p>

@return whether this function returns a Result back to the caller.
@since GemFire 6.0
geode-web-api/src/integrationTest/java/org/apache/geode/rest/internal/web/controllers/EchoArgumentFunction.java