00001 /* 00002 * MapEventTransformer.hpp 00003 * 00004 * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved. 00005 * 00006 * Oracle is a registered trademarks of Oracle Corporation and/or its 00007 * affiliates. 00008 * 00009 * This software is the confidential and proprietary information of Oracle 00010 * Corporation. You shall not disclose such confidential and proprietary 00011 * information and shall use it only in accordance with the terms of the 00012 * license agreement you entered into with Oracle. 00013 * 00014 * This notice may not be removed or altered. 00015 */ 00016 #ifndef COH_MAP_EVENT_TRANSFORMER_HPP 00017 #define COH_MAP_EVENT_TRANSFORMER_HPP 00018 00019 #include "coherence/lang.ns" 00020 00021 #include "coherence/util/MapEvent.hpp" 00022 00023 COH_OPEN_NAMESPACE2(coherence,util) 00024 00025 00026 /** 00027 * MapEventTransformer interface is used to allow an event consumer to change 00028 * the content of a MapEvent destined for the corresponding MapListener. 00029 * 00030 * In general, the #transform method is called after the 00031 * original MapEvent is evaluated by a Filter (such as 00032 * coherence::util::filter::MapEventFilter). The values contained by the 00033 * returned MapEvent object will be the ones given (sent) to the 00034 * corresponding listener. Returning null will prevent the emission of the 00035 * event altogether. 00036 * 00037 * <b>Note:</b> Currently, the MapEventTransformer interface is supported only 00038 * by partitioned caches. 00039 * 00040 * @see coherence::util::filter::MapEventTransformerFilter 00041 * 00042 * @author djl 2008.05.22 00043 */ 00044 class COH_EXPORT MapEventTransformer 00045 : public interface_spec<MapEventTransformer> 00046 { 00047 // ----- MapEventTransformer interface ---------------------------------- 00048 00049 public: 00050 /** 00051 * Transform the specified MapEvent. The values contained by the 00052 * returned MapEvent object will be the ones given (sent) to the 00053 * corresponding listener. 00054 * 00055 * @param hEvent the original MapEvent object 00056 * 00057 * @return modified MapEvent object or NULL to discard the event 00058 */ 00059 virtual MapEvent::Handle transform( 00060 MapEvent::Handle hEvent) const = 0; 00061 }; 00062 00063 COH_CLOSE_NAMESPACE2 00064 00065 #endif // COH_MAP_EVENT_TRANSFORMER_HPP