import com.google.common.base.Preconditions;
import java.util.ArrayList;
import java.util.Collection;
import com.google.common.base.Preconditions;
import java.util.ArrayList;
import java.util.Collection;
@SuppressWarnings("checkstyle:IllegalCatch")
void registerCohort(final ActorRef sender, final RegisterCohort cohort) {
takeLock();
@SuppressWarnings("checkstyle:IllegalCatch")
void registerCohort(final ActorRef sender, final RegisterCohort cohort) {
takeLock();