Double-Checked Locking

[QiAnXinCodeSafe]

stetho/stetho/src/main/java/com/facebook/stetho/inspector/helper/IntegerFormatter.java

Lines 19 to 21 in 5cc93ec

	if (cachedFormatter == null) {
	synchronized (IntegerFormatter.class) {
	if (cachedFormatter == 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.