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• cloudpool.commons
• 4.1.7
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• VictimSelectionStrategy.java

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com.elastisys.scale.cloudpool.commons.scaledown.VictimSelectionStrategy Maven / Gradle / Ivy

package com.elastisys.scale.cloudpool.commons.scaledown;

import java.util.Collection;

import com.elastisys.scale.cloudpool.api.types.Machine;

/**
 * Represents a policy for which machine instance, from a collection of machine
 * instances, to select for (eventual) termination when a scale-down of a
 * scaling group is ordered.
 */
public interface VictimSelectionStrategy {

	/**
	 * Selects which instance, from a collection of machine instances, to
	 * schedule for (eventual) termination.
	 *
	 * @param candidates
	 *            The collection of machines eligible for termination.
	 * @return The selected victim machine instance.
	 */
	Machine selectVictim(Collection candidates);
}