apollo 在 Spring boot 加载过程解析，redis 单线程原理
apollo.cacheDir = /opt
是否保持和 apollo 配置页面的配置顺序一致
apollo.property.order.enable = true
加载过程解析
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public class ApolloApplicationContextInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> , EnvironmentPostProcessor, Ordered {
public static final int DEFAULT_ORDER = 0;
private static final Logger logger = LoggerFactory.getLogger(ApolloApplicationContextInitializer.class);
private static final Splitter NAMESPACE_SPLITTER = Splitter.on(",").omitEmptyStrings().trimResults();
private static final String[] APOLLO_SYSTEM_PROPERTIES = {"app.id", ConfigConsts.APOLLO_CLUSTER_KEY,
"apollo.cacheDir", "apollo.accesskey.secret", ConfigConsts.APOLLO_META_KEY, PropertiesFactory.APOLLO_PROPERTY_ORDER_ENABLE};
private final ConfigPropertySourceFactory configPropertySourceFactory = SpringInjector.getInstance(ConfigPropertySourceFactory.class);
private int order = DEFAULT_ORDER;
@Override
public void initialize(ConfigurableApplicationContext context) {
ConfigurableEnvironment environment = context.getEnvironment();
if (!environment.getProperty(PropertySourcesConstants.APOLLO_BOOTSTRAP_ENABLED, Boolean.class, false)) {
logger.debug("Apollo bootstrap config is not enabled for context {}, see property: ${{}}", context, PropertySourcesConstants.APOLLO_BOOTSTRAP_ENABLED);
return;
}
logger.debug("Apollo bootstrap config is enabled for context {}", context);
initialize(environment);
}
/**
Initialize Apollo Configurations Just after environment is ready.
@param environment
*/
protected void initialize(ConfigurableEnvironment environment) {
if (environment.getPropertySources().contains(PropertySourcesConstants.APOLLO_BOOTSTRAP_PROPERTY_SOURCE_NAME)) {
//already initialized
return;
}
String namespaces = environment.getProperty(PropertySourcesConstants.APOLLO_BOOTSTRAP_NAMESPACES, ConfigConsts.NAMESPACE_APPLICATION);
logger.debug("Apollo bootstrap namespaces: {}", namespaces);
List<String> namespaceList = NAMESPACE_SPLITTER.splitToList(namespaces);
CompositePropertySource composite = new CompositePropertySource(PropertySourcesConstants.APOLLO_BOOTSTRAP_PROPERTY_SOURCE_NAME);
for (String namespace : namespaceList) {
Config config = ConfigService.getConfig(namespace);
composite.addPropertySource(configPropertySourceFactory.getConfigPropertySource(namespace, config));
}
environment.getPropertySources().addFirst(composite);
}
/**
To fill system properties from environment config
*/
void initializeSystemProperty(ConfigurableEnvironment environment) {
for (String propertyName : APOLLO_SYSTEM_PROPERTIES) {
fillSystemPropertyFromEnvironment(environment, propertyName);
}
}
private void fillSystemPropertyFromEnvironment(ConfigurableEnvironment environment, String propertyName) {
if (System.getProperty(propertyName) != null) {
return;
}
String propertyValue = environment.getProperty(propertyName);
if (Strings.isNullOrEmpty(propertyValue)) {
return;
}
System.setProperty(propertyName, propertyValue);
}
/**
In order to load Apollo configurations as early as even before Spring loading logging system phase,
this EnvironmentPostProcessor can be called Just After ConfigFileApplicationListener has succeeded.
<br />
The processing sequence would be like this: <br />
Load Bootstrap properties and application properties -----> load Apollo configuration properties ----> Initialize Logging systems
@param configurableEnvironment
@param springApplication
*/
@Override
public void postProcessEnvironment(ConfigurableEnvironment configurableEnvironment, SpringApplication springApplication) {
// should always initialize system properties like app.id in the first place
initializeSystemProperty(configurableEnvironment);
Boolean eagerLoadEnabled = configurableEnvironment.getProperty(PropertySourcesConstants.APOLLO_BOOTSTRAP_EAGER_LOAD_ENABLED, Boolean.class, false);
//EnvironmentPostProcessor should not be triggered if you don't want Apollo Loading before Logging System Initialization
if (!eagerLoadEnabled) {
return;
}
Boolean bootstrapEnabled = configurableEnvironment.getProperty(PropertySourcesConstants.APOLLO_BO
OTSTRAP_ENABLED, Boolean.class, false);
if (bootstrapEnabled) {
initialize(configurableEnvironment);
}
}
/**
@since 1.3.0
*/
@Override
public int getOrder() {
return order;
}
/**
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