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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * 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.wan;

import org.apache.geode.cache.CacheCallback;

/**
 * Callback for users to filter out events before dispatching to remote distributed system
 * 
 * 
 * @since GemFire 7.0
 */
public interface GatewayEventFilter extends CacheCallback {

  /**
   * It will be invoked before enqueuing event into GatewaySender's queue. 

   * This callback is synchronous with the thread which is enqueuing the event into GatewaySender's
   * queue.
   * 
   * @param event
   * @return true if event should be enqueued otherwise return false.
   */
  public boolean beforeEnqueue(GatewayQueueEvent event);

  /**
   * It will be invoked before dispatching event to remote GatewayReceiver 

   * This callback is asynchronous with the thread which is enqueuing the event into GatewaySender's
   * queue.

   * This callback will always be called from the thread which is dispatching events to remote
   * distributed systems
   * 
   * @param event
   * @return true if event should be dispatched otherwise return false.
   */
  public boolean beforeTransmit(GatewayQueueEvent event);

  /**
   * It will be invoked once GatewaySender receives an ack from remote GatewayReceiver 

   * This callback will always be called from the thread which is dispatching events to remote
   * distributed systems
   * 
   * @param event
   */
  public void afterAcknowledgement(GatewayQueueEvent event);

}