spring cloud 获取当前服务实例所在zone

1. spring cloud服务获取当前示例所在zone

com.netflix.appinfo.InstanceInfo

    
    public static String getZone(String[] availZones, InstanceInfo myInfo) {
        String instanceZone = ((availZones == null || availZones.length == 0) ? "default"
                : availZones[0]);
        if (myInfo != null
                && myInfo.getDataCenterInfo().getName() == DataCenterInfo.Name.Amazon) {

            String awsInstanceZone = ((AmazonInfo) myInfo.getDataCenterInfo())
                    .get(AmazonInfo.metaDataKey.availabilityZone);
            if (awsInstanceZone != null) {
                instanceZone = awsInstanceZone;
            }

        }
        return instanceZone;
    }

该方法在非亚马逊机房的情况下  直接返回当前availZones 的第一个节点

此方法调用发代码示例：

com.netflix.discovery.shared.transport.EurekaHttpClients.defaultBootstrapResolver方法中 调用如下：

    
    static ClosableResolver defaultBootstrapResolver(final EurekaClientConfig clientConfig,
                                                                  final InstanceInfo myInstanceInfo) {
        String[] availZones = clientConfig.getAvailabilityZones(clientConfig.getRegion());
        String myZone = InstanceInfo.getZone(availZones, myInstanceInfo);

        ClusterResolver delegateResolver = new ZoneAffinityClusterResolver(
                new ConfigClusterResolver(clientConfig, myInstanceInfo),
                myZone,
                true
        );

可以看到直接读取的clientConfig中的配置