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TIBCO Rendezvous® 8.7.0

# Transport.SendRequest

Method

## Visual Basic

    Overrideable Public Function SendRequest (
        ByVal request As Message,
        ByVal timeout As Double )
      As Message

## C#

    public virtual Message SendRequest (
        Message request,
        double timeout );

## Purpose

Send a request message and wait for a reply.

## Blocking can Stall Event Dispatch

Warning | This call blocks all other activity on its program thread. If appropriate, programmers must ensure that other threads continue dispatching events on its queues.

Parameter | Description
``request`` | Send this message.
``timeout`` | Maximum time (in seconds) that this call can block while waiting for a reply. TimeoutValue.WaitForever indicates no timeout (wait without limit for a reply).

## Remarks

When the method receives a reply, it returns the reply. When the call does not receive a reply, it returns null, indicating timeout.

Programs that receive and process the request message cannot determine that the sender has blocked until a reply arrives.

The request message must have a valid destination subject; see SendSubject.

## Operation

This method operates in several synchronous steps:

Procedure

| 1. | Create an inbox name, and an event that listens to it. Overwrite any existing reply subject of `message` with the inbox name.

| 2. | Send the outbound `message`.

| 3. | Block until the listener receives a reply; if the time limit expires before a reply arrives, then return null. (The reply circumvents the event queue mechanism, so it is not necessary to explicitly call dispatch methods in the program.)

| 4. | Return the reply as the value of this method.

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