/*
* 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;
/**
* @return true if this Op should use a threadLocalConnection, false otherwise
*/
boolean useThreadLocalConnection();
}