1 /* 2 * Copyright 2017 The gRPC Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package io.grpc; 18 19 import com.google.common.util.concurrent.ListenableFuture; 20 21 /** 22 * An internal class. Do not use. 23 * 24 * <p>An interface for types that <b>may</b> support instrumentation. If the actual type does not 25 * support instrumentation, then the future will return a {@code null}. 26 */ 27 @Internal 28 public interface InternalInstrumented<T> extends InternalWithLogId { 29 30 /** 31 * Returns the stats object. 32 */ getStats()33 ListenableFuture<T> getStats(); 34 } 35