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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.provisioning;
import com.yahoo.config.provision.NodeResources;
import java.util.Comparator;
/**
* Resource comparator
*
* @author bratseth
*/
public class NodeResourceComparator {
private static final MemoryDiskCpu memoryDiskCpuComparator = new MemoryDiskCpu();
/** Returns the default ordering */
public static Comparator<NodeResources> defaultOrder() { return memoryDiskCpuOrder(); }
/** Returns a comparator comparing by memory, disk, vcpu */
public static Comparator<NodeResources> memoryDiskCpuOrder() { return memoryDiskCpuComparator; }
private static class MemoryDiskCpu implements Comparator<NodeResources> {
@Override
public int compare(NodeResources a, NodeResources b) {
if (a.memoryGb() > b.memoryGb()) return 1;
if (a.memoryGb() < b.memoryGb()) return -1;
if (a.diskGb() > b.diskGb()) return 1;
if (a.diskGb() < b.diskGb()) return -1;
if (a.vcpu() > b.vcpu()) return 1;
if (a.vcpu() < b.vcpu()) return -1;
int storageTypeComparison = NodeResources.StorageType.compare(a.storageType(), b.storageType());
if (storageTypeComparison != 0) return storageTypeComparison;
return compare(a.diskSpeed(), b.diskSpeed());
}
private int compare(NodeResources.DiskSpeed a, NodeResources.DiskSpeed b) {
if (a == b) return 0;
if (a == NodeResources.DiskSpeed.slow) return -1;
if (b == NodeResources.DiskSpeed.slow) return 1;
return 0;
}
}
}
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