ivankelly commented on a change in pull request #1192: BP-29 (task 3): use
metadata service uri for constructing registration client
URL: https://github.com/apache/bookkeeper/pull/1192#discussion_r170574099
##########
File path:
bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/MetadataDrivers.java
##########
@@ -167,17 +167,28 @@ private static void loadInitialBookieDrivers() {
*/
public static void registerClientDriver(String metadataBackendScheme,
Class<? extends
MetadataClientDriver> driver) {
+ registerClientDriver(metadataBackendScheme, driver, false);
+ }
+
+ @VisibleForTesting
+ public static void registerClientDriver(String metadataBackendScheme,
+ Class<? extends
MetadataClientDriver> driver,
+ boolean allowOverride) {
if (!initialized) {
initialize();
}
String scheme = metadataBackendScheme.toLowerCase();
MetadataClientDriverInfo oldDriverInfo = clientDrivers.get(scheme);
- if (null != oldDriverInfo) {
+ if (null != oldDriverInfo && !allowOverride) {
return;
}
MetadataClientDriverInfo newDriverInfo = new
MetadataClientDriverInfo(driver);
- oldDriverInfo = clientDrivers.putIfAbsent(scheme, newDriverInfo);
+ if (allowOverride) {
Review comment:
It'd be better to handle all the special case branching based on a boolean
flag in one place.
```java
if (null != oldDriverInfo) {
if (allowOverride) {
log.debug("Metadata client driver for {} is already there.",
scheme);
} else {
return;
}
}
clientDrivers.put(scheme, newDriverInfo);
```
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