Github user mattf-horton commented on a diff in the pull request:
https://github.com/apache/metron/pull/530#discussion_r133529473
--- Diff:
bundles-lib/src/main/java/org/apache/metron/bundles/ExtensionManager.java ---
@@ -103,61 +104,52 @@ private ExtensionManager(){}
/**
* @return The singleton instance of the ExtensionManager
*/
- public static ExtensionManager getInstance() {
- ExtensionManager result = extensionManager;
- if (result == null) {
- synchronized (ExtensionManager.class) {
- result = extensionManager;
- if (result == null) {
- extensionManager = new ExtensionManager();
- result = extensionManager;
- }
+ public static ExtensionManager getInstance() throws
NotInitializedException {
+ synchronized (ExtensionManager.class) {
+ if (extensionManager == null) {
+ throw new NotInitializedException("ExtensionManager not
initialized");
}
+ return extensionManager;
}
- return result;
}
--- End diff --
As with BundleClassLoader, to deal with extensionManager atomically:
```java
public static ExtensionManager getInstance() throws
NotInitializedException {
ExtensionManager result = extensionManager;
if (result == null) {
throw new NotInitializedException("ExtensionManager not initialized");
}
return result;
}
```
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