Double-Checked Locking

[QiAnXinCodeSafe]

genie/genie-web/src/main/java/com/netflix/genie/web/services/impl/JobStateServiceImpl.java

Lines 164 to 167 in 75cfed7

	if (jobInfo != null) {
	synchronized (jobInfo) {
	jobInfo = jobs.get(jobId);
	if (jobInfo != null) {

double-Checked Locking is widely cited and used as an efficient method for implementing lazy initialization in a multithreaded environment.
Unfortunately, it will not work reliably in a platform independent way when implemented in Java, without additional synchronization.