| /* |
| * 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.geode.cache.client.internal; |
| |
| /** |
| * An operation to perform on a server. Used by {@link ExecutablePool} to attempt the operation on |
| * multiple servers until the retryAttempts is exceeded. |
| * |
| * @since GemFire 5.7 |
| * |
| */ |
| public interface Op { |
| |
| /** |
| * Attempts to execute this operation by sending its message out on the given connection, waiting |
| * for a response, and returning it. |
| * |
| * @param cnx the connection to use when attempting execution of the operation. |
| * @return the result of the operation or <code>null</code if the operation has no result. |
| * @throws Exception if the execute failed |
| */ |
| Object attempt(Connection cnx) throws Exception; |
| |
| } |
