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TIBCO ComputeDB store based off Pivotal GemFireXD
/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* Licensed 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.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.
* @author dsmith
* @since 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 null