com.elastisys.scale.cloudadapters.splitter.cloudadapter.poolcalculators

Enum StrictPoolSizeCalculationStrategy

java.lang.Object

java.lang.Enum<StrictPoolSizeCalculationStrategy>

com.elastisys.scale.cloudadapters.splitter.cloudadapter.poolcalculators.StrictPoolSizeCalculationStrategy

All Implemented Interfaces:

PoolSizeCalculationStrategy, Serializable, Comparable<StrictPoolSizeCalculationStrategy>

public enum StrictPoolSizeCalculationStrategy
extends Enum<StrictPoolSizeCalculationStrategy>
implements PoolSizeCalculationStrategy

A PoolSizeCalculationStrategy that ignores current machine pools and the statuses of the machines therein, and merely strictly enforces the fractions as given by the priorities and configuration order of the cloud adapters.

This class is a thread-safe singleton. The singleton instance only provides only a function of its inputs.

Enum Constant Summary

Enum Constants

Enum Constant and Description
INSTANCE The only instance of this class.

Method Summary

Methods

Modifier and Type	Method and Description
Map<PrioritizedRemoteCloudAdapter,Long>	calculatePoolSizes(Map<PrioritizedRemoteCloudAdapter,MachinePool> currentMachinePools, com.google.common.collect.ImmutableList<PrioritizedRemoteCloudAdapter> cloudAdapters, long desiredTotalSize) Calculates the correct pool sizes for the given cloud adapters.
static StrictPoolSizeCalculationStrategy	valueOf(String name) Returns the enum constant of this type with the specified name.
static StrictPoolSizeCalculationStrategy[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

INSTANCE

public static final StrictPoolSizeCalculationStrategy INSTANCE

The only instance of this class.

Method Detail

values

public static StrictPoolSizeCalculationStrategy[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (StrictPoolSizeCalculationStrategy c : StrictPoolSizeCalculationStrategy.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static StrictPoolSizeCalculationStrategy valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

calculatePoolSizes

public Map<PrioritizedRemoteCloudAdapter,Long> calculatePoolSizes(Map<PrioritizedRemoteCloudAdapter,MachinePool> currentMachinePools,
                                                         com.google.common.collect.ImmutableList<PrioritizedRemoteCloudAdapter> cloudAdapters,
                                                         long desiredTotalSize)
                                                           throws CloudAdapterException

Description copied from interface: PoolSizeCalculationStrategy

Calculates the correct pool sizes for the given cloud adapters.

Specified by:

calculatePoolSizes in interface PoolSizeCalculationStrategy

Parameters:

currentMachinePools - The current machine pools, for each adapter.

cloudAdapters - The cloud adapters, in the order in which they were configured, should that matter to the calculation.

desiredTotalSize - The desired total pool size.

Returns:

A mapping between cloud adapters and the size they should resize their pool to.

Throws:

CloudAdapterException - Thrown if there is an error, e.g., while querying current machine pools from the cloud adapters.