

package org.apache.ignite.spi.discovery;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * This annotation is for all implementations of {@link DiscoverySpi} that support
 * proper node ordering. This includes:
 * <ul>
 * <li>
 * Every node gets an order number assigned to it which is provided via {@link org.apache.ignite.cluster.ClusterNode#order()}
 * method. There is no requirement about order value other than that nodes that join grid
 * at later point of time have order values greater than previous nodes.
 * </li>
 * <li>
 * All {@link org.apache.ignite.events.EventType#EVT_NODE_JOINED} events come in proper order. This means that all
 * listeners to discovery events will receive discovery notifications in proper order.
 * </li>
 * </ul>
 */
@Documented
@Inherited
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
public @interface DiscoverySpiOrderSupport {
    /**
     * Whether or not target SPI supports node startup order.
     */
    public boolean value();
}