ee2d6658cb
Add DataItemObserver interface in SystemStatus so that clients can subscribe dataitem events from SystemStatus. Also moving DateItem and its observer, subscription classes into HAL Simplify DataItem class implementation. Change-Id: I7b2c3fc9dcf67dd6132bbcccda874e3f7ed6fa94 CRs-Fixed: 2041019 2072896
129 lines
5.5 KiB
C++
129 lines
5.5 KiB
C++
/* Copyright (c) 2015, 2017 The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation, nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef __IDATAITEMSUBSCRIPTION_H__
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#define __IDATAITEMSUBSCRIPTION_H__
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#include <list>
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#include <DataItemId.h>
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namespace loc_core
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{
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class IDataItemObserver;
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/**
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* @brief IDataItemSubscription interface
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* @details IDataItemSubscription interface;
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* Defines an interface for operations such as subscribe,
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* unsubscribe data items by their IDs.
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* Must be implemented by OS dependent code.
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*/
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class IDataItemSubscription {
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public:
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/**
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* @brief Subscribe for data items by their IDs
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* @details Subscribe for data items by their IDs;
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* An IDataItemObserver implementer invokes this method to subscribe
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* for a list of DataItems by passing in their Ids.
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* A symbolic invocation of this method in the following order
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* subscribe ( {1,2,3}, &obj), subscribe ( {2,3,4,5}, &obj)
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* where the numbers enclosed in braces indicate a list of data item Ids
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* will cause this class implementer to update its subscription list for
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* &obj to only contain the following Data Item Ids 1,2,3,4,5.
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*
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* @param l List of DataItemId
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* @param o Pointer to an instance of IDataItemObserver
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*/
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virtual void subscribe (const std :: list <DataItemId> & l, IDataItemObserver * o = NULL) = 0;
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/**
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* @brief Update subscription for Data items
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* @details Update subscription for Data items;
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* An IDataItemObserver implementer invokes this method to update their
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* subscription for a list of DataItems by passing in their Ids
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* A symbolic invocation of this method in the following order
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* updateSubscription ( {1,2,3}, &obj),updateSubscription ( {2,3,4,5}, &obj)
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* where the numbers enclosed in braces indicate a list of data item Ids
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* will cause this class implementer to update its subscription list for
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* &obj to only contain the following Data Item Ids 2,3,4,5.
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* Note that this method may or may not be called.
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*
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* @param l List of DataItemId
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* @param o Pointer to an instance of IDataItemObserver
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*/
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virtual void updateSubscription (const std :: list <DataItemId> & l, IDataItemObserver * o = NULL) = 0;
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/**
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* @brief Request Data
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* @details Request Data
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*
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* @param l List of DataItemId
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* @param o Pointer to an instance of IDataItemObserver
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*/
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virtual void requestData (const std :: list <DataItemId> & l, IDataItemObserver * o = NULL) = 0;
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/**
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* @brief Unsubscribe Data items
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* @details Unsubscrbe Data items;
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* An IDataItemObserver implementer invokes this method to unsubscribe their
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* subscription for a list of DataItems by passing in their Ids
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* Suppose this class implementor has a currently active subscription list
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* containing 1,2,3,4,5,6,7 for &obj then a symbolic invocation of this
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* method in the following order
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* unsubscribe ( {1,2,3}, &obj), unsubscribe ( {1,2,3,4}, &obj),
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* unsubscribe ( {7}, &obj)
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* where the numbers enclosed in braces indicate a list of data item Ids
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* will cause this class implementer to update its subscription list for
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* &obj to only contain the following data item id 5,6.
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*
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* @param l List of DataItemId
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* @param o Pointer to an instance of IDataItemObserver
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*/
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virtual void unsubscribe (const std :: list <DataItemId> & l, IDataItemObserver * o = NULL) = 0;
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/**
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* @brief Unsubscribe all data items
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* @details Unsubscribe all data items
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*
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* @param o Pointer to an instance of IDataItemObserver
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*/
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virtual void unsubscribeAll (IDataItemObserver * o = NULL) = 0;
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/**
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* @brief Destructor
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* @details Destructor
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*/
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virtual ~IDataItemSubscription () {}
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};
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} // namespace loc_core
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#endif // #ifndef __IDATAITEMSUBSCRIPTION_H__
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