/guava/guava/src/com/google/common/util/concurrent/ServiceManager.java
monitor.enter( ) ; checkArgument( from != to) ;checkNotNull( service) ;
checkNotNull ( service ) ; checkArgument ( from != to ) ; monitor.enter ( ) ;
return input.getValue(); } })); return ImmutableMap.copyOf(loadTimes); } void transitionService(final Service service, State from, State to) { <extra_id_0> try { transitioned = true; if (!ready) { return; } checkState(