| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.metrics; |
| |
| import org.apache.hadoop.hbase.HBaseInterfaceAudience; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.apache.yetus.audience.InterfaceStability; |
| |
| /** |
| * A metric which measure the rate at which some operation is invoked. |
| */ |
| @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC) |
| @InterfaceStability.Evolving |
| public interface Meter extends Metric { |
| |
| /** |
| * Records one occurrence. |
| */ |
| void mark(); |
| |
| /** |
| * Records {@code events} occurrences. |
| * |
| * @param events Number of occurrences to record. |
| */ |
| void mark(long events); |
| |
| /** |
| * Returns the number of events. |
| * @return the number of events. |
| */ |
| long getCount(); |
| |
| /** |
| * Returns the mean rate at which events have occurred since the meter was created. |
| * @return the mean rate at which events have occurred since the meter was created |
| */ |
| double getMeanRate(); |
| |
| /** |
| * Returns the one-minute exponentially-weighted moving average rate at which events have |
| * occurred since the meter was created. |
| * <p/> |
| * This rate has the same exponential decay factor as the one-minute load average in the {@code |
| * top} Unix command. |
| * |
| * @return the one-minute exponentially-weighted moving average rate at which events have |
| * occurred since the meter was created |
| */ |
| double getOneMinuteRate(); |
| |
| /** |
| * Returns the five-minute exponentially-weighted moving average rate at which events have |
| * occurred since the meter was created. |
| * <p/> |
| * This rate has the same exponential decay factor as the five-minute load average in the {@code |
| * top} Unix command. |
| * |
| * @return the five-minute exponentially-weighted moving average rate at which events have |
| * occurred since the meter was created |
| */ |
| double getFiveMinuteRate(); |
| |
| /** |
| * Returns the fifteen-minute exponentially-weighted moving average rate at which events have |
| * occurred since the meter was created. |
| * <p/> |
| * This rate has the same exponential decay factor as the fifteen-minute load average in the |
| * {@code top} Unix command. |
| * |
| * @return the fifteen-minute exponentially-weighted moving average rate at which events have |
| * occurred since the meter was created |
| */ |
| double getFifteenMinuteRate(); |
| } |