| /* |
| * 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.solr.common.cloud; |
| |
| import org.apache.zookeeper.KeeperException; |
| |
| /** A callback object which can be used for implementing retry-able operations. */ |
| public interface ZkOperation<T> { |
| |
| /** |
| * Performs the operation - which may be involved multiple times if the connection to ZooKeeper |
| * closes during this operation |
| * |
| * @return the result of the operation or null |
| */ |
| T execute() throws KeeperException, InterruptedException; |
| } |
