this.type = Preconditions.checkNotNull(type, "type should not be null");
this.cluster = Preconditions.checkNotNull(cluster, "cluster should not be null");
this.configuration = Preconditions.checkNotNull(configuration, "configuration should not be null");
this.type = Preconditions.checkNotNull(type, "type should not be null");
this.cluster = Preconditions.checkNotNull(cluster, "cluster should not be null");
this.configuration = Preconditions.checkNotNull(configuration, "configuration should not be null");