| /** |
| * 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.yarn.server.federation.policies; |
| |
| import org.apache.hadoop.yarn.server.federation.policies.exceptions.FederationPolicyInitializationException; |
| |
| /** |
| * This interface provides a general method to reinitialize a policy. The |
| * semantics are try-n-swap, so in case of an exception is thrown the |
| * implmentation must ensure the previous state and configuration is preserved. |
| */ |
| public interface ConfigurableFederationPolicy { |
| |
| /** |
| * This method is invoked to initialize of update the configuration of |
| * policies. The implementor should provide try-n-swap semantics, and retain |
| * state if possible. |
| * |
| * @param policyContext the new context to provide to implementor. |
| * |
| * @throws FederationPolicyInitializationException in case the initialization |
| * fails. |
| */ |
| void reinitialize(FederationPolicyInitializationContext policyContext) |
| throws FederationPolicyInitializationException; |
| } |
