import com.microsoft.windowsazure.core.DefaultBuilder; //导入依赖的package包/类
public AzureComputeServiceImpl(Settings settings) {
    super(settings);
    String subscriptionId = getRequiredSetting(settings, Management.SUBSCRIPTION_ID_SETTING);

    serviceName = getRequiredSetting(settings, Management.SERVICE_NAME_SETTING);
    String keystorePath = getRequiredSetting(settings, Management.KEYSTORE_PATH_SETTING);
    String keystorePassword = getRequiredSetting(settings, Management.KEYSTORE_PASSWORD_SETTING);
    KeyStoreType keystoreType = Management.KEYSTORE_TYPE_SETTING.get(settings);

    logger.trace("creating new Azure client for [{}], [{}]", subscriptionId, serviceName);
    try {
        // Azure SDK configuration uses DefaultBuilder which uses java.util.ServiceLoader to load the
        // various Azure services. By default, this will use the current thread's context classloader
        // to load services. Since the current thread refers to the main application classloader it
        // won't find any Azure service implementation.

        // Here we basically create a new DefaultBuilder that uses the current class classloader to load services.
        DefaultBuilder builder = new DefaultBuilder();
        for (Builder.Exports exports : ServiceLoader.load(Builder.Exports.class, getClass().getClassLoader())) {
            exports.register(builder);
        }

        // And create a new blank configuration based on the previous DefaultBuilder
        Configuration configuration = new Configuration(builder);
        configuration.setProperty(Configuration.PROPERTY_LOG_HTTP_REQUESTS, logger.isTraceEnabled());

        Configuration managementConfig = ManagementConfiguration.configure(null, configuration,
                Management.ENDPOINT_SETTING.get(settings), subscriptionId, keystorePath, keystorePassword, keystoreType);

        logger.debug("creating new Azure client for [{}], [{}]", subscriptionId, serviceName);
        client = ComputeManagementService.create(managementConfig);
    } catch (IOException e) {
        throw new ElasticsearchException("Unable to configure Azure compute service", e);
    }
}