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109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2011, OpenNebula Project Leads (OpenNebula.org) */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/* See the License for the specific language governing permissions and */
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/* limitations under the License. */
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/* -------------------------------------------------------------------------- */
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#ifndef CALLBACKABLE_H_
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#define CALLBACKABLE_H_
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#include <pthread.h>
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using namespace std;
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/**
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* ObjectSQL class. Provides a SQL backend interface, it should be implemented
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* by persistent objects.
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*/
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class Callbackable
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{
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public:
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Callbackable():cb(0),arg(0)
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{
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pthread_mutex_init(&mutex,0);
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};
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virtual ~Callbackable()
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{
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pthread_mutex_destroy(&mutex);
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};
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/**
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* Datatype for call back pointers
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*/
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typedef int (Callbackable::*Callback)(void *, int, char ** ,char **);
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/**
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* Set the callback function and custom arguments to be executed by the
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* next SQL command, and locks the mutex until unset_callback is called.
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* @param ptr to the callback function
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* @param arg custom arguments for the callback function
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*/
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void set_callback(Callback _cb, void * _arg = 0)
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{
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pthread_mutex_lock(&mutex);
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cb = _cb;
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arg = _arg;
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};
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/**
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* Test if the CallBack is set for the object.
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* @return true if the callback is set
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*/
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bool isCallBackSet()
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{
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return (cb != 0);
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};
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/**
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* Call the callback funcion set. This method must be called only if
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* isCallBackSet returns true.
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* @return the callback function return value.
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*/
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int do_callback(int num, char **values, char **names)
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{
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return (this->*cb)(arg, num, values, names);
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};
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/**
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* Unset the callback function.
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*/
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void unset_callback()
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{
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cb = 0;
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arg = 0;
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pthread_mutex_unlock(&mutex);
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}
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private:
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/**
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* SQL callback to be executed for each row result of an SQL statement
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*/
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Callback cb;
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/**
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* Custom arguments for the callback
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*/
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void * arg;
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/**
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* Mutex for locking the callback function.
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*/
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pthread_mutex_t mutex;
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};
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#endif /*CALLBACKABLE_H_*/
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