Support concurrent loading of Config for different namespaces (#29)

Author: zth9

apollo-client/src/main/java/com/ctrip/framework/apollo/internals/DefaultConfigManager.java

@@ -44,7 +44,7 @@ public Config getConfig(String namespace) {
     Config config = m_configs.get(namespace);
 
     if (config == null) {
-      synchronized (this) {
+      synchronized (buildLock(namespace)) {
         config = m_configs.get(namespace);
 
         if (config == null) {
@@ -65,7 +65,7 @@ public ConfigFile getConfigFile(String namespace, ConfigFileFormat configFileFor
     ConfigFile configFile = m_configFiles.get(namespaceFileName);
 
     if (configFile == null) {
-      synchronized (this) {
+      synchronized (buildLock(namespaceFileName)) {
         configFile = m_configFiles.get(namespaceFileName);
 
         if (configFile == null) {
@@ -79,4 +79,8 @@ public ConfigFile getConfigFile(String namespace, ConfigFileFormat configFileFor
 
     return configFile;
   }
+
+  private String buildLock(String factor) {
+    return (String.format("%s.%s", getClass().getName(), factor)).intern();
+  }
 }