io.netty.channel

Interface SelectStrategy

public interface SelectStrategy

Select strategy interface. Provides the ability to control the behavior of the select loop. For example a blocking select operation can be delayed or skipped entirely if there are events to process immediately.

Field Summary

Fields

Modifier and Type	Field and Description
static int	BUSY_WAIT Indicates the IO loop to poll for new events without blocking.
static int	CONTINUE Indicates the IO loop should be retried, no blocking select to follow directly.
static int	SELECT Indicates a blocking select should follow.

Method Summary

Modifier and Type	Method and Description
int	calculateStrategy(IntSupplier selectSupplier, boolean hasTasks) The SelectStrategy can be used to steer the outcome of a potential select call.

Field Detail

SELECT

static final int SELECT

Indicates a blocking select should follow.

See Also:

Constant Field Values

CONTINUE

static final int CONTINUE

Indicates the IO loop should be retried, no blocking select to follow directly.

See Also:

Constant Field Values

BUSY_WAIT

static final int BUSY_WAIT

Indicates the IO loop to poll for new events without blocking.

See Also:

Constant Field Values

Method Detail

calculateStrategy

int calculateStrategy(IntSupplier selectSupplier,
                      boolean hasTasks)
               throws Exception

The SelectStrategy can be used to steer the outcome of a potential select call.

Parameters:

selectSupplier - The supplier with the result of a select result.

hasTasks - true if tasks are waiting to be processed.

Returns:

SELECT if the next step should be blocking select CONTINUE if the next step should be to not select but rather jump back to the IO loop and try again. Any value >= 0 is treated as an indicator that work needs to be done.

Throws:

Exception