1 /* 2 * Copyright 2018, 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.implcore.metrics; 18 19 import io.opencensus.common.Clock; 20 import io.opencensus.metrics.export.Metric; 21 import javax.annotation.Nullable; 22 23 interface Meter { 24 /** 25 * Provides a {@link io.opencensus.metrics.export.Metric} with one or more {@link 26 * io.opencensus.metrics.export.TimeSeries}. 27 * 28 * @param clock the clock used to get the time. 29 * @throws NullPointerException if {@code TimeSeries} is not present in {@code Metric}. 30 * @return a {@code Metric}. 31 */ 32 @Nullable getMetric(Clock clock)33 Metric getMetric(Clock clock); 34 } 35