MessageChannel (Spring Framework 5.2.12.RELEASE API)

All Known Subinterfaces:
PollableChannel, SubscribableChannel
All Known Implementing Classes:
AbstractMessageChannel, AbstractSubscribableChannel, ExecutorSubscribableChannel
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface MessageChannel
```
Defines methods for sending messages.
Since:
4.0
Author:
Mark Fisher

Field Summary
Fields
Modifier and Type Field Description
static long INDEFINITE_TIMEOUT
Constant for sending a message without a prescribed timeout.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default boolean`	`send(Message<?> message)`	Send a `Message` to this channel.
`boolean`	`send(Message<?> message, long timeout)`	Send a message, blocking until either the message is accepted or the specified timeout period elapses.

- Field Detail
  - INDEFINITE_TIMEOUT
```
static final long INDEFINITE_TIMEOUT
```
    Constant for sending a message without a prescribed timeout.
    See Also:
    Constant Field Values
- Method Detail
  - send
```
default boolean send(Message<?> message)
```
    Send a Message to this channel. If the message is sent successfully, the method returns true. If the message cannot be sent due to a non-fatal reason, the method returns false. The method may also throw a RuntimeException in case of non-recoverable errors.
    This method may block indefinitely, depending on the implementation. To provide a maximum wait time, use send(Message, long).
    Parameters:
    message - the message to send
    Returns:
    whether or not the message was sent
  - send
```
boolean send(Message<?> message,
             long timeout)
```
    Send a message, blocking until either the message is accepted or the specified timeout period elapses.
    Parameters:
    message - the message to send
    timeout - the timeout in milliseconds or INDEFINITE_TIMEOUT
    Returns:
    true if the message is sent, false if not including a timeout of an interrupt of the send