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Source:How does autowiring work in Spring?
public class MySingleton {
private static volatile MySingleton INSTANCE;
@SuppressWarnings("UnusedAssignment")
public static void initialize(
final SomeDependency someDependency) {
MySingleton result = INSTANCE;
if (result != null) {
throw new IllegalStateException("The singleton has already "
+ "been initialized.");
}
synchronized (MySingleton.class) {
result = INSTANCE;
if (result == null) {
INSTANCE = result = new MySingleton(someDependency);
}
}
}
public static MySingleton get() {
MySingleton result = INSTANCE;
if (result == null) {
throw new IllegalStateException("The singleton has not been "
+ "initialized. You must call initialize(...) before "
+ "calling get()");
}
return result;
}
...
}
