001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.coprocessor; 019 020import org.apache.hadoop.hbase.CoprocessorEnvironment; 021import org.apache.hadoop.hbase.HBaseInterfaceAudience; 022import org.apache.hadoop.hbase.metrics.MetricRegistry; 023import org.apache.hadoop.hbase.wal.WAL; 024import org.apache.yetus.audience.InterfaceAudience; 025import org.apache.yetus.audience.InterfaceStability; 026 027@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC) 028@InterfaceStability.Evolving 029public interface WALCoprocessorEnvironment extends CoprocessorEnvironment<WALCoprocessor> { 030 /** Returns reference to the region server's WAL */ 031 WAL getWAL(); 032 033 /** 034 * Returns a MetricRegistry that can be used to track metrics at the region server level. 035 * <p> 036 * See ExampleRegionServerObserverWithMetrics class in the hbase-examples modules for examples of 037 * how metrics can be instantiated and used. 038 * </p> 039 * @return A MetricRegistry for the coprocessor class to track and export metrics. 040 */ 041 MetricRegistry getMetricRegistryForRegionServer(); 042}