SelectStrategy Type — netty Architecture

Source Code

transport/src/main/java/io/netty/channel/SelectStrategy.java lines 26–52

public interface SelectStrategy {

    /**
     * Indicates a blocking select should follow.
     */
    int SELECT = -1;
    /**
     * Indicates the IO loop should be retried, no blocking select to follow directly.
     */
    int CONTINUE = -2;
    /**
     * Indicates the IO loop to poll for new events without blocking.
     */
    int BUSY_WAIT = -3;

    /**
     * The {@link SelectStrategy} can be used to steer the outcome of a potential select
     * call.
     *
     * @param selectSupplier The supplier with the result of a select result.
     * @param hasTasks true if tasks are waiting to be processed.
     * @return {@link #SELECT} if the next step should be blocking select {@link #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.
     */
    int calculateStrategy(IntSupplier selectSupplier, boolean hasTasks) throws Exception;
}