| /** |
| * 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.ipc; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * Used by {@link DecayRpcScheduler} to get the cost of users' operations. This |
| * is configurable using |
| * {@link org.apache.hadoop.fs.CommonConfigurationKeys#IPC_COST_PROVIDER_KEY}. |
| */ |
| public interface CostProvider { |
| |
| /** |
| * Initialize this provider using the given configuration, examining only |
| * ones which fall within the provided namespace. |
| * |
| * @param namespace The namespace to use when looking up configurations. |
| * @param conf The configuration |
| */ |
| void init(String namespace, Configuration conf); |
| |
| /** |
| * Get cost from {@link ProcessingDetails} which will be used in scheduler. |
| * |
| * @param details Process details |
| * @return The cost of the call |
| */ |
| long getCost(ProcessingDetails details); |
| } |
