1 /* 2 * Copyright 2017, OpenCensus 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.opencensus.internal; 18 19 import io.opencensus.common.Scope; 20 21 /** A {@link Scope} that does nothing when it is created or closed. */ 22 public final class NoopScope implements Scope { 23 private static final Scope INSTANCE = new NoopScope(); 24 NoopScope()25 private NoopScope() {} 26 27 /** 28 * Returns a {@code NoopScope}. 29 * 30 * @return a {@code NoopScope}. 31 */ getInstance()32 public static Scope getInstance() { 33 return INSTANCE; 34 } 35 36 @Override close()37 public void close() {} 38 } 39